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2024-07-10 Stormwater Management Plan
✓t 5 Alchemy Sound & Vision Corporate Office Oak Park Heights MN Paul Larson 1:7 Storm Water Management Plan (SWMP) to d� jyjy �fv ry fs f Fy �ffif f yyi 5 frf RECEIVED JUL 1 7 2024 I HEREBY CERTIFY THAT THIS PLAN,SPECIFICATION OR REPORT WAS PREPARED BY ME OR UNDER MY DIRECT SUPERVISION AND THAT I AM A DULY LICENSED ENGINEER UNDER THE LAWS OF THE STATE OF MINNESOTA. PRINT NAME: Eli Rupnow SIGNATURE: DATE:July 10,2024 License No:46681 3 �' �Suite 12 <y I jf 5�'% yl ✓' �f" f iv�fr / r� L-t SITEWhite Bear Lake MN f l F1 �t ecom / f F,a051. Appendices Appendix A. Drainage Boundary Figures Appendix B: Construction Plans Appendix C: HydroCAD Report Appendix D: NRCS Soil Survey Output SITE Executive Summary This report summarizes the drainage analysis performed for the Alchemy Sound &Vision corporate office development.The site is 0.82 acres in size and located in Oak Park Heights, MN. It is proposed to be developed as an office-industrial property.Approval is requested to construct the site as proposed in the attached documents.Quantities of different surfaces in the construction area will change as shown in Table 1. Table 1. Impervious Coverage Summary Surface Type Pre Project Area Post Project Area Net Change [ac] [ac] [ac] Impervious Surface 0.00 0.37 0.37 Pervious Surface 0.82 0.45 -0.37 TOTAL 0.82 0.82 Water Quality As shown by the table,the net impervious surface increase is 0.37 acres.This increase in impervious is due to the roof surface of the building and adjacent parking surfaces on the site. Due to the increase in impervious surface, infiltration basins are used to improve the water quality. Wherever feasible,the site utilizes the better site design practice of disconnecting the impervious surfaces by keeping water on the surface and utilizing sheet flow to convey drainage for pretreatment of sediment prior to entering the treatment features.This treatment approach provides additional benefit beyond that quantified by the modeling provided in this report. Water Quantity and Peak Rates An analysis has been performed to determine the impact that the proposed parking surfaces and building, and the associated storm water improvements will have for the 2-, 10-, and 100-year 24-hour rainfall events. HydroCAD modeling information can be found in Appendix C. - r .cfr.:••4 SITE Flr, .4 ,44,' ,'� t r �<�. x, Narrative Alchemy Sound&Vision is proposing to construct corporate office building in Oak Park Heights, MN.The subject property includes approximately 4/5 of an acre to be re-graded as part of the construction activity.The construction results in 0.37 acres of new net impervious area generated on the site. In order to meet Oak Park Heights, Middle St. Croix Water Management Organization (MSCWMO)and MPCA standards,two infiltration basins will be constructed to collect and treat the runoff generated by the new impervious surfaces. The site surface soils consist of well drained soils in Hydrologic Soils Group (HSG) B.See Appendix B for USGS soil information. Due to the ability of these soils to infiltrate stormwater runoff, infiltration has been proposed as the primary treatment method for this project. Rainfall for the 24-hour storm duration in Oak Park Heights, Minnesota for the 2-, 10-,and 100-year storm events in Table 2. Table 2. Rainfall for the 24-hour storm duration in Oak Park Heights, Minnesota Storm Event Rainfall (inches) 2-year 2.80 10-year 4.16 100-year 7.20 SOURCE:Atlas 14-Rainfall Distribution Pre-Construction Conditions A delineation of the drainage areas can be seen in Appendix A.The size, time of concentration, and curve number along with calculations for the 2-, 10-, and 100-year storm events for existing runoff can be found in Appendix C. The site is currently undeveloped and drains to the north and west under existing conditions.The existing peak runoff rates can be found in Table 3. Table 3. Existing Peak Runoff Summary for 24-hr Storms(CFS) 2-YEAR 10-YEAR 100-YEAR TOTAL 0.05 0.43 2.17 siTE � ,p,� `" r r r' �zrx ,:41--;:f;47,5"-x4,; ._ � s,s o t f, 4 f 4's` ,,.r#`a �: 1' /���� rlr�� ,r� �`' x 7 � $�,F,y r'r"i``°Vit^ u,€ ,,,,t r;+' i } r .fin„ ,}r f oxo, = q,:, ?, V„ Pgliv b J Post-Construction Conditions A delineation of the drainage basin and a visual depiction of the HydroCAD modeling schematic can be seen in Appendix A.The size, time of concentration, and curve number along with calculations for the 2-, 10 , and 100 year storms for proposed runoff can be found in Appendix C. The proposed site design will utilize sheet flow drainage to route runoff.The proposed treatment facilities are sized to collect and infiltrate the runoff from the 1.1-inch of rainfall runoff from the impervious surface to control and treat stormwater runoff. Requirements state that the existing flow rates out of the project area be reduced under post-construction conditions.The proposed peak runoff rates leaving the site are summarized in Table 4. Table 4. Proposed Peak Runoff Rate Summary for 24-hr Storms(CFS) 2-YEAR 10-YEAR 100-YEAR TOTAL 0.02 0.26 1.38 A comparison between the existing and proposed drainage conditions can be found in Table 5. Table 5. Peak Runoff Rate Summary Change for 24-hr Storms (CFS) 2-YEAR 10-YEAR 100-YEAR TOTAL -0.03 -0.17 -0.79 The proposed site meets state and Oak Park Heights and MSCWMO rules by reducing peak runoff rates. Freeboard and 100 Year High Water Level (HWL) The 100 Year High Water Levels and freeboards for the building and infiltration basins are shown in Table 6 below.The proposed site meets the freeboard requirement. Table 6. High Water Level Summary FEATURE ADJACENT OUTLET INVERT WQ FEATURE FREEBOARD FEATURE 100-YR HWL[FT] BUILDING BOTTOM[FT] [FT] DEPTH[FT] [Fr] FFE[FT] INF-1 933.0 935.0 938.0 934.8 1.8 3.0 INF-2 932.0 933.0 938.0 932.8 0.8 5.0 siTE 0;4 + 5 # 4y r ^ ," y mo1 : C £ 1: cfstf 'S # , ; � $ z �' Rf ifriZ ,: 3 4F /.cow ; Water Quality(Infiltration Volume) This project is required to infiltrate the volume of runoff from 1.1-inches of impervious surface runoff from the site.As calculated in the HydroCAD Model, Infiltration Basin#1 has 5,192 cubic feet of storage below the outlet and Infiltration Basin#2 has 547 SF of storage for a total of 5,739 SF storage capacity for infiltration below the outlet elevation while the impervious surface area of 0.37 acres multiplied by 1.1-inches yields 1,477 cubic feet of runoff that is required to be treated.As calculated,the basin infiltrates the required volume of runoff. Wetlands No wetlands were identified on the site. It is well drained and slopes significantly to the north and west. �' r s F. x t �xa'�` �"� 3 ,'£ � 1 " �f �.��?"F � wr y •, ,s .�',Sse' �, .... � ,. gi' *` Y ' ts,vicia.,tow ;A;1 k Appendix A. Dra i nage Boundary Figures / �t *Et '�; xk � .� t F"� �, ' �`'..s,' •! a :.�` as aw Y � a *"��,* L.-". ITE : z .�.�� hbk' s . 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AppendixC: HydroCAD Report r �r t .t. s�? r +' n r x''�: t,a. ✓ -t f -,.. �*t ,' , y r..7> 1 `?r .,„, „„ ,f 1 . X, „ t ,n� ,� _ � .!s . EXISTING EX-TOT EX-TOTAL E2 El PROPOSED P4 PR-TOT 7 PR-TO L 4 ( P3) P4 INF-2 P3 P2 P2 A ,_____ K P1 P1 INF-1 (Subca) Reach on• 111 Routing Diagram for 24-07-Alchemy Sound-OPH 2024-07-10 Prepared by Eli Rupnow, Printed 7/11/2024 HydroCAD®10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC 24-07 -Alchemy Sound - OPH 2024-07-10 Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 2 Project Notes Rainfall events imported from "Atlas-14-Rain.txt" for 481 MN Washington 24-07 -Alchemy Sound - OPH 2024-07-10 Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 3 Rainfall Events Listing (selected events) Event# Event Storm Type Curve Mode Duration B/B Depth AMC Name (hours) (inches) 1 2-Year MSE 24-hr 3 Default 24.00 1 2.80 2 2 10-Year MSE 24-hr 3 Default 24.00 1 4.16 2 3 100-Year MSE 24-hr 3 Default 24.00 1 7.20 2 24-07 -Alchemy Sound - OPH 2024-07-10 Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 4 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 0.450 61 >75% Grass cover, Good, HSG B (P1, P2, P3, P4) 0.370 98 Unconnected roofs, HSG B (P1, P2, P3) 0.820 55 Woods, Good, HSG B (E1, E2) 1.640 66 TOTAL AREA 24-07 -Alchemy Sound - OPH 2024-07-10 Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 5 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 1.640 HSG B El, E2, P1, P2, P3, P4 0.000 HSG C 0.000 HSG D 0.000 Other 1.640 TOTAL AREA 24-07 -Alchemy Sound - OPH 2024-07-10 Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 6 Ground Covers (all nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 0.450 0.000 0.000 0.000 0.450 >75% Grass cover, Good P1, P2, P3, P4 0.000 0.370 0.000 0.000 0.000 0.370 Unconnected roofs P1, P2, P3 0.000 0.820 0.000 0.000 0.000 0.820 Woods, Good E1, E2 0.000 1.640 0.000 0.000 0.000 1.640 TOTAL AREA 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 7 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment El: El Runoff Area=0.110 ac 0.00% Impervious Runoff Depth>0.13" Flow Length=23' Slope=0.2000 'I' Tc=5.0 min CN=55 Runoff=0.01 cfs 0.001 af Subcatchment E2: E2 Runoff Area=0.710 ac 0.00% Impervious Runoff Depth>0.13" Flow Length=182' Tc=15.0 min CN=55 Runoff=0.04 cfs 0.008 af Subcatchment P1: P1 Runoff Area=0.490 ac 51.02% Impervious Runoff Depth>1.05" Tc=5.0 min CN=80 Runoff=0.99 cfs 0.043 af Subcatchment P2: P2 Runoff Area=0.060 ac 83.33% Impervious Runoff Depth>1.90" Tc=5.0 min CN=92 Runoff=0.21 cfs 0.010 of Subcatchment P3: P3 Runoff Area=0.230 ac 30.43% Impervious Runoff Depth>0.65" Tc=5.0 min CN=72 Runoff=0.28 cfs 0.012 of Subcatchment P4: P4 Runoff Area=0.040 ac 0.00% Impervious Runoff Depth>0.27" Tc=5.0 min CN=61 Runoff=0.01 cfs 0.001 af Reach EX-TOT: EX-TOTAL Inflow=0.05 cfs 0.009 af Outflow=0.05 cfs 0.009 af Reach PR-TOT: PR-TOTAL Inflow=0.02 cfs 0.003 af Outflow=0.02 cfs 0.003 af Pond INF1: INF-1 Peak Elev=933.65' Storage=1,613 cf Inflow=1.20 cfs 0.052 af Discarded=0.03 cfs 0.020 af Primary=0.00 cfs 0.000 af Outflow=0.03 cfs 0.020 af Pond INF2: INF-2 Peak Elev=932.55' Storage=301 cf Inflow=0.28 cfs 0.012 af Discarded=0.01 cfs 0.006 af Primary=0.01 cfs 0.002 af Secondary=0.00 cfs 0.000 af Outflow=0.02 cfs 0.007 af Total Runoff Area= 1.640 ac Runoff Volume=0.074 af Average Runoff Depth =0.54" 77.44% Pervious= 1.270 ac 22.56% Impervious=0.370 ac 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 8 Summary for Subcatchment El: El [49] Hint: Tc<2dt may require smaller dt Runoff = 0.01 cfs @ 12.33 hrs, Volume= 0.001 af, Depth> 0.13" Routed to Reach EX-TOT : EX-TOTAL Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 2-Year Rainfall=2.80" Area (ac) CN Description 0.110 55 Woods, Good, HSG B 0.110 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 2.8 23 0.2000 0.14 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.80" 2.2 Direct Entry, min 5 minutes 5.0 23 Total Subcatchment El: El Hydrograph j1 1 I 0.008 ( i I ❑Runoff o.ol cfs 0.007_ MSE 24-h3 0.007 f I 0.0063 ' 2-Year ainfaII=2.8 " 0006V II 0.00s' V Run ff rea=0.110 ac o.00s/ unoff olume=0.001 of w004 7G II 1° ! Rui! oi De' th>0.13" 3. u° 0.0031 FIo Len th=23' 0.003 I SI pe0.2000 '/' °.°02_ i I /�� I T =5.0 nin 000zl ! i ! �, o.001 V f Imonmeitiza,5 0.001_ J %// ( f i // o.000V 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 9 Summary for Subcatchment E2: E2 Runoff = 0.04 cfs @ 12.50 hrs, Volume= 0.008 af, Depth> 0.13" Routed to Reach EX-TOT : EX-TOTAL Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 2-Year Rainfall=2.80" Area (ac) CN Description 0.710 55 Woods, Good, HSG B 0.710 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.9 100 0.0700 0.12 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.80" 1.1 82 0.0600 1.22 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 15.0 182 Total Subcatchment E2: E2 Hydrograph 0.046 i I ' 0 Runoff 0.044- , j 0.042 I o.oa as 0.04/ MI E 24-6r 3 � 0036V 2- eat R4inf• II= .80f' 4 0.034 1 / t ' 0.032 Rinoff Area 0.7 0 ac 0028v Riinoff Volu e= .0018 a �'0j 0:024/ Runoff Dept >0.13" ; �% LL 002024 Flew Lenth 18 ' ' 0 . 8' 00.001,6- Too=15.0 in ,40.0 0.0,2✓ CN=55 I1111L___"7.". L2z ✓ 001. i Il6 I 0.00 � / //////% 0.0043✓ I 1 0.002 ' 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 10 Summary for Subcatchment P1: P1 [49] Hint: Tc<2dt may require smaller dt Runoff = 0.99 cfs @ 12.12 hrs, Volume= 0.043 af, Depth> 1.05" Routed to Pond INF1 : INF-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 2-Year Rainfall=2.80" Area (ac) CN Description 0.240 61 >75% Grass cover, Good, HSG B 0.250 98 Unconnected roofs, HSG B 0.490 80 Weighted Average 0.240 48.98% Pervious Area 0.250 51.02% Impervious Area 0.250 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment P1: P1 Hydrograph 1 0 Runoff 0.99cfs MSE 24-h 3 1-Y ar Rainfall=2.80" Runff Area=0.490 ac Runoff;Volum ' =0.043'of ROnoff D pth>1.05" OAT =50 rin N=80 I I • 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 11 Summary for Subcatchment P2: P2 [49] Hint: Tc<2dt may require smaller dt Runoff = 0.21 cfs @ 12.11 hrs, Volume= 0.010 af, Depth> 1.90" Routed to Pond INF1 : INF-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 2-Year Rainfall=2.80" Area (ac) CN Description 0.010 61 >75% Grass cover, Good, HSG B 0.050 98 Unconnected roofs, HSG B 0.060 92 Weighted Average 0.010 16.67% Pervious Area 0.050 83.33% Impervious Area 0.050 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment P2: P2 Hydrograph / j I11 0.23✓ 1 1 13 Runoff 0.22 10.21 cfs I I 0.19_ 2-Year Rai all .30" a18 ( j 1_.i I Runoff Ore —0. 60 c 0.16 0.15 Ruoff Volum =0. 10a f 0.14 LI 013✓ " t ' Runoff DeOth 1. 0"- - 0.12_ ( E O11 11c=5 0 in oos0.09v N-92 0.07 E-/ j I 0.06= oo / , I O. 5 oaf 1 I I i 0.03 C 1 0.02✓ ! / 0.01'. /���,/. "v'// 4WPAelf Aefor���������� "Kee,Ze 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Pape 12 Summary for Subcatchment P3: P3 [49] Hint: Tc<2dt may require smaller dt Runoff = 0.28 cfs @ 12.13 hrs, Volume= 0.012 af, Depth> 0.65" Routed to Pond INF2 : INF-2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 2-Year Rainfall=2.80" Area (ac) CN Description 0.160 61 >75% Grass cover, Good, HSG B 0.070 98 Unconnected roofs, HSG B 0.230 72 Weighted Average 0.160 69.57% Pervious Area 0.070 30.43% Impervious Area 0.070 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment P3: P3 Hydrograph 0.34./ ; 0 Runoff / 1028th. V I 0.28-x, .� M$E 24-h 3 0.26- 024- ! I 2-Year Rainfall=2. 0" 0.22/ t I Runoffrea=0.230 bac 0.21 i r i f ! Runoff Vol ane=0.012 af 0.16- ! Runoff Depth>0.65" 0.141 TQC=5.0 i n 0.12 � ! I CN— 2 0.08 V 0.06/0.04/ j kiph% 0.02- ����444�������������������������� 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 13 Summary for Subcatchment P4: P4 [49] Hint: Tc<2dt may require smaller dt Runoff = 0.01 cfs @ 12.16 hrs, Volume= 0.001 af, Depth> 0.27" Routed to Reach PR-TOT : PR-TOTAL Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 2-Year Rainfall=2.80" Area (ac) CN Description 0.040 61 >75% Grass cover, Good, HSG B 0.000 98 Unconnected roofs, HSG B 0.040 61 Weighted Average 0.040 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment P4: P4 Hydrograph 0.015 l I i 0 Runoff ool cfs I I 0.0,3 24-h 3 1 0.012/ 1 I -Ye r ainfiall=2.8 '' 0.011 � I I unoff rea=0.040 ,c 0.01 0.009/ { urjoff Vol me=0.001 af 12 O.006 ! Runo DeOth>0.27" ° 0.007 TO=5.0 m i n � LL 0.0061 ' I ?N=01 0.005V 0.004) 0.003 0.002 ( • 0.001_ ���r%097,ZeeZ, 0 . . . . . . , . .. . . . . . . . . . 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 14 Summary for Reach EX-TOT: EX-TOTAL [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.820 ac, 0.00% Impervious, Inflow Depth > 0.13" for 2-Year event Inflow = 0.05 cfs @ 12.49 hrs, Volume= 0.009 af Outflow = 0.05 cfs @ 12.49 hrs, Volume= 0.009 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach EX-TOT: EX-TOTAL Hydrograph ❑Inflow 0.05 ds ❑Outflow 0 0517 = ' " � . • ' • 0.045 � 4� 0.04_ 001 0.035 % w 0.03 � 3I/ o 0 025 IT � 0.02 0 11 I� �0.015. /// t 0.01: r////////////////////%/ 0.005" /////////////////. %Zeo//////////. ,. o= ////////////////// .Y..,////// 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 15 Summary for Reach PR-TOT: PR-TOTAL [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.820 ac, 45.12% Impervious, Inflow Depth > 0.04" for 2-Year event Inflow = 0.02 cfs @ 13.29 hrs, Volume= 0.003 of Outflow = 0.02 cfs @ 13.29 hrs, Volume= 0.003 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach PR-TOT: PR-TOTAL Hydrograph ! I 0.018 t I I t ❑Inflow //// 1 0.02 a5 ❑Outflow 0.0,72 a O ( a . . moi : 1 �0 0.016: � ' � 0.015. , i /� 0.014 , 00 0.013 00 I 0.01 0.012 ij rI , r% 000 I 0.011 'o.00s' I00 - u. /r •���_ 0.008) / � /,/0.0071 0 � #r0.006 0.00 f 0.004: IijF 1 8 I ; �I ��0.003: �� � �j/./, w- wo.00z1 ' � /l// 0.001 //////////////////Y///// / I////////: ,/- ////// // 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g sin 12731 ©2022 HydroCAD Software Solutions LLC Page 16 Summary for Pond INF1: INF-1 Inflow Area = 0.550 ac, 54.55% Impervious, Inflow Depth > 1.14" for 2-Year event Inflow = 1.20 cfs @ 12.12 hrs, Volume= 0.052 af Outflow = 0.03 cfs @ 15.08 hrs, Volume= 0.020 af, Atten= 98%, Lag= 177.8 min Discarded = 0.03 cfs @ 15.08 hrs, Volume= 0.020 af Primary = 0.00 cfs @ 5.00 hrs, Volume= 0.000 af Routed to Reach PR-TOT : PR-TOTAL Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 933.65' © 15.08 hrs Surf.Area= 2,711 sf Storage= 1,613 cf Plug-Flow detention time= 230.0 min calculated for 0.019 af(37% of inflow) Center-of-Mass det. time= 158.0 min ( 946.8- 788.8 ) Volume Invert Avail.Storage Storage Description #1 933.00' 26,686 cf Custom Stage Data(Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 933.00 2,262 0 0 936.00 4,337 9,899 9,899 938.00 6,000 10,337 20,236 939.00 6,900 6,450 26,686 Device Routing Invert Outlet Devices #1 Primary 930.00' 15.0" Round Culvert L= 190.0' CPP, end-section conforming to fill, Ke= 0.500 Inlet/Outlet Invert= 930.00'/927.88' S= 0.0112 'P Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 934.80' 15.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Discarded 933.00' 0.450 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.03 cfs @ 15.08 hrs HW=933.65' (Free Discharge) t-3=Exfiltration (Exfiltration Controls 0.03 cfs) Primary OutFlow Max=0.00 cfs @ 5.00 hrs HW=933.00' (Free Discharge) t-1=Culvert (Passes 0.00 cfs of 7.96 cfs potential flow) t-2=Orifice/Grate ( Controls 0.00 cfs) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 17 Pond INF1: INF-1 Hydrograph 0 Inflow 1.20 cfs I Outflow nflpw Ar a=p.550 Oc o°n arded ry I1eak lev933.615' I ; Storage1,&13 �Cf I I I I w 0 dr, or re 7.:v- • 0 03 cfs Z,Z:z/AeZZZOrer, 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Pond INF1: INF-1 Stage-Area-Storage Surface/Horizontal/Wetted Area(sq-ft) 0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 6,000 6,500 ❑Surface •I I I � .' ! I 0 Storage 939 938 ///// I , i I d c 0 936 I � I I 934 - custom Stage Data 0 5,000 10,000 15,000 20,000 25,000 Storage(cubic-feet) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 18 Stage-Area-Storage for Pond INF1: INF-1 Elevation Surface Storage Elevation Surface Storage (feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet) 933.00 2,262 0 938.20 6,180 21,454 933.10 2,331 230 938.30 6,270 22,076 933.20 2,400 466 938.40 6,360 22,707 933.30 2,469 710 938.50 6,450 23,348 933.40 2,539 960 938.60 6,540 23,998 933.50 2,608 1,217 938.70 6,630 24,656 933.60 2,677 1,482 938.80 6,720 25,323 933.70 2,746 1,753 938.90 6,810 26,000 933.80 2,815 2,031 939.00 6,900 26,686 933.90 2,884 2,316 934.00 2,954 2,608 934.10 3,023 2,907 934.20 3,092 3,212 934.30 3,161 3,525 934.40 3,230 3,845 934.50 3,300 4,171 934.60 3,369 4,505 934.70 3,438 4,845 934.80 3,507 5,192 934.90 3,576 5,546 935.00 3,645 5,907 935.10 3,715 6,275 935.20 3,784 6,650 935.30 3,853 7,032 935.40 3,922 7,421 935.50 3,991 7,816 935.60 4,060 8,219 935.70 4,130 8,629 935.80 4,199 9,045 935.90 4,268 9,468 936.00 4,337 9,899 936.10 4,420 10,336 936.20 4,503 10,783 936.30 4,586 11,237 936.40 4,670 11,700 936.50 4,753 12,171 936.60 4,836 12,650 936.70 4,919 13,138 936.80 5,002 13,634 936.90 5,085 14,139 937.00 5,169 14,651 937.10 5,252 15,172 937.20 5,335 15,702 937.30 5,418 16,239 937.40 5,501 16,785 937.50 5,584 17,339 937.60 5,667 17,902 937.70 5,751 18,473 937.80 5,834 19,052 937.90 5,917 19,640 938.00 6,000 20,236 938.10 6,090 20,840 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 19 Summary for Pond INF2: INF-2 Inflow Area = 0.230 ac, 30.43% Impervious, Inflow Depth > 0.65" for 2-Year event Inflow = 0.28 cfs @ 12.13 hrs, Volume= 0.012 of Outflow = 0.02 cfs @ 13.33 hrs, Volume= 0.007 af, Atten= 92%, Lag= 71.9 min Discarded = 0.01 cfs @ 13.33 hrs, Volume= 0.006 af Primary = 0.01 cfs @ 13.33 hrs, Volume= 0.002 af Routed to Reach PR-TOT : PR-TOTAL Secondary= 0.00 cfs @ 5.00 hrs, Volume= 0.000 af Routed to Reach PR-TOT : PR-TOTAL Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 932.55' @ 13.33 hrs Surf.Area= 855 sf Storage= 301 cf Plug-Flow detention time= 190.6 min calculated for 0.007 af(59% of inflow) Center-of-Mass det. time= 115.9 min ( 926.2- 810.3 ) Volume Invert Avail.Storage Storage Description #1 932.00' 2,476 cf Custom Stage Data(Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 932.00 235 0 0 933.00 1,358 797 797 934.00 2,000 1,679 2,476 Device Routing Invert Outlet Devices #1 Primary 932.50' 15.0" Round Culvert L= 22.0' CPP, end-section conforming to fill, Ke= 0.500 Inlet/Outlet Invert= 932.50'/927.88' S= 0.2100 Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Discarded 932.00' 0.450 in/hr Exfiltration over Surface area #3 Secondary 933.50' 5.0' long x 5.0' breadth EOF Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.34 2.50 2.70 2.68 2.68 2.66 2.65 2.65 2.65 2.65 2.67 2.66 2.68 2.70 2.74 2.79 2.88 Discarded OutFlow Max=0.01 cfs @ 13.33 hrs HW=932.55' (Free Discharge) L2=Exfiltration (Exfiltration Controls 0.01 cfs) Primary OutFlow Max=0.01 cfs @ 13.33 hrs HW=932.55' (Free Discharge) t1=Culvert (Inlet Controls 0.01 cfs @ 0.78 fps) Secondary OutFlow Max=0.00 cfs @ 5.00 hrs HW=932.00' (Free Discharge) 3=EOF (Controls 0.00 cfs) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 20 Pond INF2: INF-2 Hydrograph I 1 I 1 1 ❑Inflow ( 10.28 as I Outflow a=0.2 ®Discad ❑Primary 0.3 I 1 1 • _ _ • _E Secondary 0.26 ' tori'ag -=301 0 0.26 0.24 11 0.22 I 0.2 i ! a 0.18 r 0.16 o i I . 0.14 i I I , 0.12 I0.08 1 "2• I//1///1//!/////////////////!//// 0.06 ////////////////////7"/Z. % rte' >` ' ", 0.04 0 01 ds r / --- o.- ////////,. ///////////////////Aillip ///2//77/7////f.///// o.00 cls 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Pond INF2: INF-2 Stage-Area-Storage Surface/Horizontal/Wetted Area(sq-ft) 0 200 400 600 800 1I,000 1,2�00 r 1,400 1,60 0 1,8I 00 2,000 Surface /i ' ' ' ' ' 11 ' ' ' ' 1 ' ' 1 . . ' ' ' ' D Storage 934- ! 1 ` I , —7I j ' �// I I p 933 ,,-' ;✓� '' I I 1 ! w j ! ;i I I ` I i 1 !I I I I! Custom Stage Data / /I. / Z, Z, / ' , ' / ' /932 (. (. • . . (. ( ( (1 (, I • ((. ., 0 200 400 600 800 1,000 1,200 1,400 1,600 1,800 2,000 2,200 2,400 Storage(cubic-feet) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 21 Stage-Area-Storage for Pond INF2: INF-2 Elevation Surface Storage Elevation Surface Storage (feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet) 932.00 235 0 933.04 1,384 851 932.02 257 5 933.06 1,397 879 932.04 280 10 933.08 1,409 907 932.06 302 - 16 933.10 1,422 936 932.08 325 22 933.12 1,435 964 932.10 347 29 933.14 1,448 993 932.12 370 36 933.16 1,461 1,022 932.14 392 44 933.18 1,474 1,051 932.16 415 52 933.20 1,486 1,081 932.18 437 60 933.22 1,499 1,111 932.20 460 69 933.24 1,512 1,141 932.22 482 79 933.26 1,525 1,171 932.24 505 89 933.28 1,538 1,202 932.26 527 99 933.30 1,551 1,233 932.28 549 110 933.32 1,563 1,264 932.30 572 121 933.34 1,576 1,295 932.32 594 133 933.36 1,589 1,327 932.34 617 145 933.38 1,602 1,359 932.36 639 157 933.40 1,615 1,391 932.38 662 170 933.42 1,628 1,423 932.40 684 184 933.44 1,640 1,456 932.42 707 198 933.46 1,653 1,489 932.44 729 212 933.48 1,666 1,522 932.46 752 227 933.50 1,679 1,556 932.48 774 242 933.52 1,692 1,589 932.50 797 258 933.54 1,705 1,623 932.52 819 274 933.56 1,718 1,658 932.54 841 291 933.58 1,730 1,692 932.56 864 308 933.60 1,743 1,727 932.58 886 325 933.62 1,756 1,762 932.60 909 343 933.64 1,769 1,797 932.62 931 362 933.66 1,782 1,833 932.64 954 380 933.68 1,795 1,868 932.66 976 400 933.70 1,807 1,904 932.68 999 419 933.72 1,820 1,941 932.70 1,021 440 933.74 1,833 1,977 932.72 1,044 460 933.76 1,846 2,014 932.74 1,066 481 933.78 1,859 2,051 932.76 1,088 503 933.80 1,872 2,088 932.78 1,111 525 933.82 1,884 2,126 932.80 1,133 547 933.84 1,897 2,164 932.82 1,156 570 933.86 1,910 2,202 932.84 1,178 594 933.88 1,923 2,240 932.86 1,201 617 933.90 1,936 2,279 932.88 1,223 642 933.92 1,949 2,318 932.90 1,246 666 933.94 1,961 2,357 932.92 1,268 691 933.96 1,974 2,396 932.94 1,291 717 933.98 1,987 2,436 932.96 1,313 743 934.00 2,000 2,476 932.98 1,336 770 933.00 1,358 797 933.02 1,371 824 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 22 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment El: El Runoff Area=0.110 ac 0.00% Impervious Runoff Depth>0.55" Flow Length=23' Slope=0.2000 Tc=5.0 min CN=55 Runoff=0.10 cfs 0.005 af Subcatchment E2: E2 Runoff Area=0.710 ac 0.00% Impervious Runoff Depth>0.55" Flow Length=182' Tc=15.0 min CN=55 Runoff=0.39 cfs 0.032 of Subcatchment P1: P1 Runoff Area=0.490 ac 51.02% Impervious Runoff Depth>2.08" Tc=5.0 min CN=80 Runoff=1.96 cfs 0.085 af Subcatchment P2: P2 Runoff Area=0.060 ac 83.33% Impervious Runoff Depth>3.17" Tc=5.0 min CN=92 Runoff=0.34 cfs 0.016 af Subcatchment P3: P3 Runoff Area=0.230 ac 30.43% Impervious Runoff Depth>1.49" Tc=5.0 min CN=72 Runoff=0.66 cfs 0.029 of Subcatchment P4: P4 Runoff Area=0.040 ac 0.00% Impervious Runoff Depth>0.84" Tc=5.0 min CN=61 Runoff=0.06 cfs 0.003 of Reach EX-TOT: EX-TOTAL Inflow=0.43 cfs 0.037 af Outflow=0.43 cfs 0.037 af Reach PR-TOT: PR-TOTAL Inflow=0.26 cfs 0.019 of Outflow=0.26 cfs 0.019 af Pond INF1: INF-1 Peak Elev=934.27' Storage=3,420 cf Inflow=2.30 cfs 0.101 af Discarded=0.03 cfs 0.024 of Primary=0.00 cfs 0.000 of Outflow=0.03 cfs 0.024 af Pond INF2: INF-2 Peak Elev=932.72' Storage=462 cf Inflow=0.66 cfs 0.029 af Discarded=0.01 cfs 0.006 of Primary=0.24 cfs 0.016 of Secondary=0.00 cfs 0.000 of Oufflow=0.25 cfs 0.023 of Total Runoff Area= 1.640 ac Runoff Volume=0.170 af Average Runoff Depth = 1.24" 77.44% Pervious= 1.270 ac 22.56% Impervious=0.370 ac 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 23 Summary for Subcatchment El: El [49] Hint: Tc<2dt may require smaller dt Runoff = 0.10 cfs @ 12.14 hrs, Volume= 0.005 af, Depth> 0.55" Routed to Reach EX-TOT : EX-TOTAL Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 10-Year Rainfall=4.16" Area (ac) CN Description 0.110 55 Woods, Good, HSG B 0.110 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 2.8 23 0.2000 0.14 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.80" 2.2 Direct Entry, min 5 minutes 5.0 23 Total Subcatchment El: El Hydrograph 0.105 1 ❑Runoff 0.1: l ot�s I 1 00952 ! ! I MSE 24-hr 3 0.085 10-Year Iairlfall=4.16" 0.08- j , I 0.075= Runoff re '=0.110 ac 0.07 0.065 �RuroffVor m =0.D05 of 3 o.oss f ' Runoff Depth>0.515" o 0 0451 Flow Length= 3' 004 { 104 Slope=0.2000_ 0.03_5 r/ Ti =5.0 min 0.025l� ooz CN=55 0.015. " � 4 0014/ + r y 0.005 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 24 Summary for Subcatchment E2: E2 Runoff = 0.39 cfs @ 12.29 hrs, Volume= 0.032 af, Depth> 0.55" Routed to Reach EX-TOT : EX-TOTAL Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 10-Year Rainfall=4.16" Area (ac) CN Description 0.710 55 Woods, Good, HSG B 0.710 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.9 100 0.0700 0.12 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.80" 1.1 82 0.0600 1.22 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 15.0 182 Total Subcatchment E2: E2 Hydrograph 0.42- ( j 0 Runoff 0.4=/ 10.39cfs l 036 f I MSE 24-h 3 0.34Y ' 10-Year Fairfall=4.16" 0.33 Runoff dre =0.710 lac 0.3- j rt I 0.26 � 00 Runoff Volum =0.032 of 0.24- ' I Runoff Depth>0.55" ° 18. I Flo Le gth=182' 0.18 t � 0.16- Tc 15,0 min 0.14 ^w' 0.12 / C NI 55 0.081 0.06 i j ' o.oa srI iisiiire 0.03 — , „ , , r . 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 25 Summary for Subcatchment P1: P1 [49] Hint: Tc<2dt may require smaller dt Runoff = 1.96 cfs @ 12.12 hrs, Volume= 0.085 af, Depth> 2.08" Routed to Pond INF1 : INF-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 10-Year Rainfall=4.16" Area (ac) CN Description 0.240 61 >75% Grass cover, Good, HSG B 0.250 98 Unconnected roofs, HSG B 0.490 80 Weighted Average 0.240 48.98% Pervious Area 0.250 51.02% Impervious Area 0.250 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment P1: P1 Hydrograph 0 Runoff 2-/ 1 1.96 cfs MSE 24-h! 3 10-YOar Rainfall=4.16" Run ff Area=0. 90 ac Runoff,VoI'ume=0.085 of I I Runoff Depth>2. 8" 11 TC=5.0 rain CN=80 # � I 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 26 Summary for Subcatchment P2: P2 [49] Hint: Tc<2dt may require smaller dt Runoff = 0.34 cfs @ 12.11 hrs, Volume= 0.016 af, Depth> 3.17" Routed to Pond INF1 : INF-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 10-Year Rainfall=4.16" Area (ac) CN Description 0.010 61 >75% Grass cover, Good, HSG B 0.050 98 Unconnected roofs, HSG B 0.060 92 Weighted Average 0.010 16.67% Pervious Area 0.050 83.33% Impervious Area 0.050 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment P2: P2 Hydrograph ' i 1 I 0 Runoff 0.36 I034cfs 034 V i I MSE 24-hr- 3 0.32: 0.3: 19-Year Rainfall=4.1j6" 0.26= I qunoff Area=0.060 lac 0.24: Ruoff Vol` me=0.016 of 0.22 2. 0.2: 1 Ru no Depth>3.117" c 0.18: I LL 0.16 Tc=5.0 in 0.14 CN-92 I 0.12: 0.1 kl 1 0.08: 0.06' j 1 1 0.04: 02: /..z 'IP 427;# //./.e :z.0Z/zoo.)red PY 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 27 Summary for Subcatchment P3: P3 [49] Hint: Tc<2dt may require smaller dt Runoff = 0.66 cfs @ 12.12 hrs, Volume= 0.029 af, Depth> 1.49" Routed to Pond INF2 : INF-2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 10-Year Rainfall=4.16" Area (ac) CN Description 0.160 61 >75% Grass cover, Good, HSG B 0.070 98 Unconnected roofs, HSG B 0.230 72 Weighted Average 0.160 69.57% Pervious Area 0.070 30.43% Impervious Area 0.070 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment P3: P3 Hydrograph I ! i ❑Runoff 0.7_ loss cfs I I 0.65 I 1 MSE 24-h - 3 0.55 I ; C 1 -Year Rainfall=4.16" 051 ! I unoff Are0=0.230 lac 0.451 Runoff Vol ume=0.029 af Fa 0.41 ' Runoff Depth>1.49" g LL 0.33- I !0.311 ;� Tc=5 O Tin ! ! I 1 ! I i I CN=D 2 0.251 j 011A o.z1 ` � � I 0.151 i � 1 0.11 1 0.05 1;r..4. I�' 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 28 Summary for Subcatchment P4: P4 [49] Hint: Tc<2dt may require smaller dt Runoff = 0.06 cfs @ 12.13 hrs, Volume= 0.003 af, Depth> 0.84" Routed to Reach PR-TOT : PR-TOTAL Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 10-Year Rainfall=4.16" Area (ac) CN Description 0.040 61 >75% Grass cover, Good, HSG B 0.000 98 Unconnected roofs, HSG B 0.040 61 Weighted Average 0.040 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment P4: P4 Hydrograph 1 1 ❑Runoff 0.065 j 0.06 as I j 0.06- V MSE 24-hr 3 0.055 t ' i 10-Yelar RainfalL=4.1p" 0.055 0.0451 I i Runoff 4rea=0.040 �ac 0 041 unoff �/olume=0.003 af 0.0351 j / F Ruoff Depth>0. " o j j LL 0.031 Tc=5.0 in 0.0251 ' � ' CN=�61 0.021 o.o1s5 0.01 0.005 ! ///////// 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 29 Summary for Reach EX-TOT: EX-TOTAL [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.820 ac, 0.00% Impervious, Inflow Depth > 0.55" for 10-Year event Inflow = 0.43 cfs @ 12.28 hrs, Volume= 0.037 af Outflow = 0.43 cfs @ 12.28 hrs, Volume= 0.037 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach EX-TOT: EX-TOTAL Hydrograph 1 t f i I ! I ! ❑Inflow 0.48 0.46 I 10.43 cfs ! ! 0 Outflow 0.447 0.43 cfs nf low r a= .820 ac 0.42; $ . 0.38 t 0.36✓✓✓✓✓✓� j 0.34 0.32 I 1 � 0.3 /� t 1 0.281 i ! I v 0.26 "0® I I 3 0.24 a 0.22 �� i I I 0 27 0.18. 0.16 { ���i 0.1 !0.14i + ��'0.067 Akre('{ 0.08 , � ElIlk— // //////////////////////f 0.04 //zezdze///////pyrnezl/////ei � ///////////////// 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 30 Summary for Reach PR-TOT: PR-TOTAL [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.820 ac, 45.12% Impervious, Inflow Depth > 0.28" for 10-Year event Inflow = 0.26 cfs @ 12.26 hrs, Volume= 0.019 of Outflow = 0.26 cfs @ 12.26 hrs, Volume= 0.019 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach PR-TOT: PR-TOTAL Hydrograph 0 Inflow 0.28= � I (ozs cfs I I ( I I 0Outflow f 026 ri a=O.8 0 c 0.26 V A 024- / 0.22! 0.2 t t fjI /0.18 �// /�t 0.16 o ala 4/0 0.12 1 0.06_ I I. /� 006 0.04 4f,to /� 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 31 Summary for Pond INF1: INF-1 Inflow Area = 0.550 ac, 54.55% Impervious, Inflow Depth > 2.20" for 10-Year event Inflow = 2.30 cfs @ 12.12 hrs, Volume= 0.101 af Outflow = 0.03 cfs @ 16.78 hrs, Volume= 0.024 af, Atten= 99%, Lag= 279.9 min Discarded = 0.03 cfs @ 16.78 hrs, Volume= 0.024 af Primary = 0.00 cfs @ 5.00 hrs, Volume= 0.000 af Routed to Reach PR-TOT : PR-TOTAL Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 934.27' @ 16.78 hrs Surf.Area= 3,138 sf Storage= 3,420 cf Plug-Flow detention time= 232.8 min calculated for 0.024 af(24% of inflow) Center-of-Mass det. time= 152.8 min ( 931.4- 778.5 ) Volume Invert Avail.Storage Storage Description #1 933.00' 26,686 cf Custom Stage Data(Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 933.00 2,262 0 0 936.00 4,337 9,899 9,899 938.00 6,000 10,337 20,236 939.00 6,900 6,450 26,686 Device Routing Invert Outlet Devices #1 Primary 930.00' 15.0" Round Culvert L= 190.0' CPP, end-section conforming to fill, Ke= 0.500 Inlet/Outlet Invert= 930.00'/927.88' S= 0.0112 '1 Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 934.80' 15.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Discarded 933.00' 0.450 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.03 cfs @ 16.78 hrs HW=934.27' (Free Discharge) t3=Exfiltration (Exfiltration Controls 0.03 cfs) Primary OutFlow Max=0.00 cfs @ 5.00 hrs HW=933.00' (Free Discharge) t1=Culvert (Passes 0.00 cfs of 7.96 cfs potential flow) L2=Orifice/Grate ( Controls 0.00 cfs) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 32 Pond INF1: INF-1 Hydrograph / 1 I 1 I 2.3OcfsI I I 0 Inflow E Outflow nflw Ar a=0.5 0 c 181 Prarryded 2i/ 113eak lev=9 4.2 ' 1 1 Stora e=3,420 f 4, 0 - 0 - il 1 . 11 I IC 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Pond INF1: INF-1 Stage-Area-Storage Surface/Horizontal/Wetted Area(sq-ft) 0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 6,000 6,500 a ai...I-face 1 1 orage 939. zr, 938Y I x/Z/ , 937:/- [ ,/ • ', ' - - / [ s 936-7 V : 934V- ! - 933 . . .Custornpage Data . . . . . . . . . / . . . // 0 5,000 10,000 15,000 20,000 25,000 Storage(cubic-feet) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 33 Stage-Area-Storage for Pond INF1: INF-1 Elevation Surface Storage Elevation Surface Storage (feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet) 933.00 2,262 0 938.20 6,180 21,454 933.10 2,331 230 938.30 6,270 22,076 933.20 2,400 466 938.40 6,360 22,707 933.30 2,469 710 938.50 6,450 23,348 933.40 2,539 960 938.60 6,540 23,998 933.50 2,608 1,217 938.70 6,630 24,656 933.60 2,677 1,482 938.80 6,720 25,323 933.70 2,746 1,753 938.90 6,810 26,000 933.80 2,815 2,031 939.00 6,900 26,686 933.90 2,884 2,316 934.00 2,954 2,608 934.10 3,023 2,907 934.20 3,092 3,212 934.30 3,161 3,525 934.40 3,230 3,845 934.50 3,300 4,171 934.60 3,369 4,505 934.70 3,438 4,845 934.80 3,507 5,192 934.90 3,576 5,546 935.00 3,645 5,907 935.10 3,715 6,275 935.20 3,784 6,650 935.30 3,853 7,032 935.40 3,922 7,421 935.50 3,991 7,816 935.60 4,060 8,219 935.70 4,130 8,629 935.80 4,199 9,045 935.90 4,268 9,468 936.00 4,337 9,899 936.10 4,420 10,336 936.20 4,503 10,783 936.30 4,586 11,237 936.40 4,670 11,700 936.50 4,753 12,171 936.60 4,836 12,650 936.70 4,919 13,138 936.80 5,002 13,634 936.90 5,085 14,139 937.00 5,169 14,651 937.10 5,252 15,172 937.20 5,335 15,702 937.30 5,418 16,239 937.40 5,501 16,785 937.50 5,584 17,339 937.60 5,667 17,902 937.70 5,751 18,473 937.80 5,834 19,052 937.90 5,917 19,640 938.00 6,000 20,236 938.10 6,090 20,840 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g sin 12731 ©2022 HydroCAD Software Solutions LLC Page 34 Summary for Pond INF2: INF-2 Inflow Area = 0.230 ac, 30.43% Impervious, Inflow Depth > 1.49" for 10-Year event Inflow = 0.66 cfs @ 12.12 hrs, Volume= 0.029 af Outflow = 0.25 cfs @ 12.27 hrs, Volume= 0.023 af, Atten= 63%, Lag= 9.0 min Discarded = 0.01 cfs @ 12.27 hrs, Volume= 0.006 af Primary = 0.24 cfs @ 12.27 hrs, Volume= 0.016 af Routed to Reach PR-TOT : PR-TOTAL Secondary = 0.00 cfs @ 5.00 hrs, Volume= 0.000 af Routed to Reach PR-TOT : PR-TOTAL Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 932.72' @ 12.27 hrs Surf.Area= 1,045 sf Storage= 462 cf Plug-Flow detention time= 91.4 min calculated for 0.023 af(79% of inflow) Center-of-Mass det. time= 39.7 min (834.9-795.2 ) Volume Invert Avail.Storage Storage Description #1 932.00' 2,476 cf Custom Stage Data(Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 932.00 235 0 0 933.00 1,358 797 797 934.00 2,000 1,679 2,476 Device Routing Invert Outlet Devices #1 Primary 932.50' 15.0" Round Culvert L= 22.0' CPP, end-section conforming to fill, Ke= 0.500 Inlet/Outlet Invert= 932.50' /927.88' S= 0.2100 Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Discarded 932.00' 0.450 in/hr Exfiltration over Surface area #3 Secondary 933.50' 5.0' long x 5.0' breadth EOF Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.34 2.50 2.70 2.68 2.68 2.66 2.65 2.65 2.65 2.65 2.67 2.66 2.68 2.70 2.74 2.79 2.88 Discarded OutFlow Max=0.01 cfs @ 12.27 hrs HW=932.72' (Free Discharge) t2=Exfiltration (Exfiltration Controls 0.01 cfs) Primary OutFlow Max=0.23 cfs @ 12.27 hrs HW=932.72' (Free Discharge) t1=Culvert (Inlet Controls 0.23 cfs @ 1.60 fps) Secondary OutFlow Max=0.00 cfs @ 5.00 hrs HW=932.00' (Free Discharge) 3=EOF ( Controls 0.00 cfs) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 35 Pond INF2: INF-2 Hydrograph Inflow I loss as I { Outflow I Inflow IAr4a=0..2.30 ac 0 Discarded p Primary 0.7 Pea_!‘ ea Ellev 932.722' Secondary 0.65 Otoutage=462 cf 0.6 0.55 2 0.5 2 0.45 f F j Ti l { 0.4 I o.zs cfs,' i I I g 0.35 I 1 t r u- 0.3 Ir" 0.25 I 4', I 2 0.15 //�///////////f/��//////� 1 4/7:41��ee.r. /� ��/�z,iszsz, 0.• ///����./)//./rr 4%. .&�/5��7./����a ..,��������������������/�� 0.00 ds � 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Pond INF2: INF-2 Stage-Area-Storage Surface/Horizontal/Wetted Area(sq-ft) 0 200 400 600 800 1,000 1,2001,400 1,600 1,800 2,000 0 Surface i I I{ ' I ( I } 0 Storage 934 1 { ! ;I i � 1 I it I i ; � ,/A ; j 1 l j 1 � I I//,/ / I I /// 1 //' I w 2I 2 // i I ' I{ Iz'0 933 1 I � " 'i. i II i Ii/ f- 1, { 11 j ! 1 1 1 rte- 2 ! I rte 1 , j ; 1 1 ii 1 1 1 r 1 1 � ( 1 l 1 F 1 t l I I i' J I l ! ! / 2 / 17/ r2 , 1 ' r'' . . Z. 932 (. . o, . . ( f r, r. �' 1 0 200 400 600 800 1,000 1,200 1,400 1,600 1,800 2,000 2,200 2,400 Storage(cubic-feet) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 36 Stage-Area-Storage for Pond INF2: INF-2 Elevation Surface Storage Elevation Surface Storage (feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet) 932.00 235 0 933.04 1,384 851 932.02 257 5 933.06 1,397 879 932.04 280 10 933.08 1,409 907 932.06 302 16 933.10 1,422 936 932.08 325 22 933.12 1,435 964 932.10 347 29 933.14 1,448 993 932.12 370 36 933.16 1,461 1,022 932.14 392 44 933.18 1,474 1,051 932.16 415 52 933.20 1,486 1,081 932.18 437 60 933.22 1,499 1,111 932.20 460 69 933.24 1,512 1,141 932.22 482 79 933.26 1,525 1,171 932.24 505 89 933.28 1,538 1,202 932.26 527 99 933.30 1,551 1,233 932.28 549 110 933.32 1,563 1,264 932.30 572 121 933.34 1,576 1,295 932.32 594 133 933.36 1,589 1,327 932.34 617 145 933.38 1,602 1,359 932.36 639 157 933.40 1,615 1,391 932.38 662 170 933.42 1,628 1,423 932.40 684 184 933.44 1,640 1,456 932.42 707 198 933.46 1,653 1,489 932.44 729 212 933.48 1,666 1,522 932.46 752 227 933.50 1,679 1,556 932.48 774 242 933.52 1,692 1,589 932.50 797 258 933.54 1,705 1,623 932.52 819 274 933.56 1,718 1,658 932.54 841 291 933.58 1,730 1,692 932.56 864 308 933.60 1,743 1,727 932.58 886 325 933.62 1,756 1,762 932.60 909 343 933.64 1,769 1,797 932.62 931 362 933.66 1,782 1,833 932.64 954 380 933.68 1,795 1,868 932.66 976 400 933.70 1,807 1,904 932.68 999 419 933.72 1,820 1,941 932.70 1,021 440 933.74 1,833 1,977 932.72 1,044 460 933.76 1,846 2,014 932.74 1,066 481 933.78 1,859 2,051 932.76 1,088 503 933.80 1,872 2,088 932.78 1,111 525 933.82 1,884 2,126 932.80 1,133 547 933.84 1,897 2,164 932.82 1,156 570 933.86 1,910 2,202 932.84 1,178 594 933.88 1,923 2,240 932.86 1,201 617 933.90 1,936 2,279 932.88 1,223 642 933.92 1,949 2,318 932.90 1,246 666 933.94 1,961 2,357 932.92 1,268 691 933.96 1,974 2,396 932.94 1,291 717 933.98 1,987 2,436 932.96 1,313 743 934.00 2,000 2,476 932.98 1,336 770 933.00 1,358 797 933.02 1,371 824 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 37 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment El: El Runoff Area=0.110 ac 0.00% Impervious Runoff Depth>2.13" Flow Length=23' Slope=0.2000 'I' Tc=5.0 min CN=55 Runoff=0.45 cfs 0.020 af Subcatchment E2: E2 Runoff Area=0.710 ac 0.00% Impervious Runoff Depth>2.12" Flow Length=182' Tc=15.0 min CN=55 Runoff=1.97 cfs 0.126 af Subcatchment P1: P1 Runoff Area=0.490 ac 51.02% Impervious Runoff Depth>4.70" Tc=5.0 min CN=80 Runoff=4.28 cfs 0.192 af Subcatchment P2: P2 Runoff Area=0.060 ac 83.33% Impervious Runoff Depth>6.05" Tc=5.0 min CN=92 Runoff=0.62 cfs 0.030 af Subcatchment P3: P3 Runoff Area=0.230 ac 30.43% Impervious Runoff Depth>3.84" Tc=5.0 min CN=72 Runoff=1.69 cfs 0.074 of Subcatchment P4: P4 Runoff Area=0.040 ac 0.00% Impervious Runoff Depth>2.71" Tc=5.0 min CN=61 Runoff=0.21 cfs 0.009 af Reach EX-TOT: EX-TOTAL Inflow=2.17 cfs 0.145 af Outflow=2.17 cfs 0.145 af Reach PR-TOT: PR-TOTAL Inflow=1.38 cfs 0.141 af Outflow=1.38 cfs 0.141 af Pond INF1: INF-1 Peak Elev=934.95' Storage=5,731 cf Inflow=4.90 cfs 0.222 af Discarded=0.04 cfs 0.030 af Primary=0.77 cfs 0.073 af Outflow=0.80 cfs 0.103 af Pond INF2: INF-2 Peak EIev=933.02' Storage=829 cf Inflow=1.69 cfs 0.074 af Discarded=0.01 cfs 0.007 af Primary=1.20 cfs 0.060 af Secondary=0.00 cfs 0.000 af Outflow=1.21 cfs 0.067 af Total Runoff Area= 1.640 ac Runoff Volume= 0.450 af Average Runoff Depth=3.29" 77.44% Pervious = 1.270 ac 22.56% Impervious =0.370 ac 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 38 Summary for Subcatchment El: El [49] Hint: Tc<2dt may require smaller dt Runoff = 0.45 cfs @ 12.13 hrs, Volume= 0.020 af, Depth> 2.13" Routed to Reach EX-TOT : EX-TOTAL Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 100-Year Rainfall=7.20" Area (ac) CN Description 0.110 55 Woods, Good, HSG B 0.110 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 2.8 23 0.2000 0.14 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.80" 2.2 Direct Entry, min 5 minutes 5.0 23 Total Subcatchment El: El Hydrograph 0.5 f I CIRunoff 0.48: I 0.46 i l 0.45 crs I 0.44✓0.42- MSE 24-hr 3 038 100-Year Rainfall=7.20" 0.36✓ Runoff Area=0.110 ac 0.34: 0.32 3✓ I i Runoff Vol ume=0.020'of 0. 0.26 i F Runo Depth>2. �3" 026z-/ g 0.24 LI 0.22 Flo Length= 3' 12 08✓ t , SIYh .200 'I' 0.16- i 0.14=i I T =5.0 in 0.12 00 1 I� 0.02; 1111MI-;'//////// //////////////////// o" 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 39 Summary for Subcatchment E2: E2 Runoff = 1.97 cfs @ 12.25 hrs, Volume= 0.126 af, Depth> 2.12" Routed to Reach EX-TOT : EX-TOTAL Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 100-Year Rainfall=7.20" Area (ac) CN Description 0.710 55 Woods, Good, HSG B 0.710 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.9 100 0.0700 0.12 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.80" 1.1 82 0.0600 1.22 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 15.0 182 Total Subcatchment E2: E2 Hydrograph / I V I I I ❑Runoff 2--./ J 11.97 cfs I , 1 ME 4-hr 3 10 -Y ar ai faII7.20" - un ff re =0.710 lac - ! Ru off Volum ' =O.'126�af I i � - ' R nof$ Depth'2.12" 1- ° loin, Length=182' Tc:15 0 min 1100 ON=155 0Z,Ze,////////////////////////////---���. 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 40 Summary for Subcatchment P1: P1 [49] Hint: Tc<2dt may require smaller dt Runoff = 4.28 cfs @ 12.12 hrs, Volume= 0.192 af, Depth> 4.70" Routed to Pond INF1 : INF-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 100-Year Rainfall=7.20" Area (ac) CN Description 0.240 61 >75% Grass cover, Good, HSG B 0.250 98 Unconnected roofs, HSG B 0.490 80 Weighted Average 0.240 48.98% Pervious Area 0.250 51.02% Impervious Area 0.250 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment P1: P1 Hydrograph j I I 0 Runoff 41 4.28 cfs MSE 24-fir 3 106-Ycar Rainfall=7. 0" Run iff Area=0.490 �ac 3 Rulijloff'Volume=0.1921 of RLnof1 Depth>4.7 0" 2 { Tc=50 nein CN=80 1 ze,,:z kr.4 ftyy 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 41 Summary for Subcatchment P2: P2 [49] Hint: Tc<2dt may require smaller dt Runoff = 0.62 cfs @ 12.11 hrs, Volume= 0.030 af, Depth> 6.05" Routed to Pond INF1 : INF-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 100-Year Rainfall=7.20" Area (ac) CN Description 0.010 61 >75% Grass cover, Good, HSG B 0.050 98 Unconnected roofs, HSG B 0.060 92 Weighted Average 0.010 16.67% Pervious Area 0.050 83.33% Impervious Area 0.050 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment P2: P2 Hydrograph I rt 0.65Y El Runoff 0.62 are MSE 24-h 3 0.55 j 100-Y-ar Fainfall=7.210" 0.51/ Run off 4re- =0.060 Bc 0.45 I e a - .. ..—I 1 1 ' 0.4-" • 0.35-/ I ! ! Ru of� De th>6. +5" I _ I T =5.0 LL 0.3� � min 0.25V CN 92 0.2-' 1 o.ts' I i ' � 0 /////////////////// ` //// ///// 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 42 Summary for Subcatchment P3: P3 [49] Hint: Tc<2dt may require smaller dt Runoff = 1.69 cfs @ 12.12 hrs, Volume= 0.074 af, Depth> 3.84" Routed to Pond INF2 : INF-2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 100-Year Rainfall=7.20" Area (ac) CN Description 0.160 61 >75% Grass cover, Good, HSG B 0.070 98 Unconnected roofs, HSG B 0.230 72 Weighted Average 0.160 69.57% Pervious Area 0.070 30.43% Impervious Area 0.070 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment P3: P3 Hydrograph ❑Runoff 'i. 11.69 cfs f MSE 4-1.1r. 3 100-YOr F�ainfall 7.?�O" Itun*ff 4ireal=0.230pc Ruoff Volume=0.074'of 1-/ ! ; I R noft Depth>3.84" LL ! TQC=5 0 mm n N=72 „7,74fiep.v0A z/327 •0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Pape 43 Summary for Subcatchment P4: P4 [49] Hint: Tc<2dt may require smaller dt Runoff = 0.21 cfs @ 12.12 hrs, Volume= 0.009 af, Depth> 2.71" Routed to Reach PR-TOT : PR-TOTAL Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 100-Year Rainfall=7.20" Area (ac) CN Description 0.040 61 >75% Grass cover, Good, HSG B 0.000 98 Unconnected roofs, HSG B 0.040 61 Weighted Average 0.040 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment P4: P4 Hydrograph { 0.23- - 0 Runoff 0.22 10.21 cfs 1 1 f 021=1 02MSE 24-0 3 E 100-Year F aminefall=7.2.0 " 0.18 OC1V Runoff 4rea=0.040 ac so014_✓ Runoff Vo =0.009 of 013- RunoDepth>2.710.12✓ T =5.0 mingo; o.os CN=61 0.08 I 0o°s✓07 I I o.os 0.04 0.03 J 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 44 Summary for Reach EX-TOT: EX-TOTAL [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.820 ac, 0.00% Impervious, Inflow Depth > 2.12" for 100-Year event Inflow = 2.17 cfs @ 12.24 hrs, Volume= 0.145 of Outflow = 2.17 cfs @ 12.24 hrs, Volume= 0.145 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach EX-TOT: EX-TOTAL Hydrograph j ; I p Inflow 2.n cfs ❑Outflow 2:/ ®v, �nfljow Area=p.8 0 c - 7,- � i i ii°Ii /♦ .-4 �1 AL" •• 47,,,,,,-„,- 4 U//////////.////////.//// " ///////////////////////Z%Z4#274 I//////////////////////// 0 ///////////////////./"Y //////// 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 45 Summary for Reach PR-TOT: PR-TOTAL [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.820 ac, 45.12% Impervious, Inflow Depth > 2.07" for 100-Year event Inflow = 1.38 cfs @ 12.17 hrs, Volume= 0.141 af Outflow = 1.38 cfs @ 12.17 hrs, Volume= 0.141 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach PR-TOT: PR-TOTAL Hydrograph 11 38cfs I 0 Outflow Ill38cf i NnflOw Ar,a=0.8 0 ac r0 LL ° f/ ' 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 46 Summary for Pond INF1: INF-1 Inflow Area = 0.550 ac, 54.55% Impervious, Inflow Depth > 4.85" for 100-Year event Inflow = 4.90 cfs @ 12.11 hrs, Volume= 0.222 af Outflow = 0.80 cfs @ 12.46 hrs, Volume= 0.103 af, Atten= 84%, Lag= 21.0 min Discarded = 0.04 cfs @ 12.46 hrs, Volume= 0.030 af Primary = 0.77 cfs @ 12.46 hrs, Volume= 0.073 af Routed to Reach PR-TOT : PR-TOTAL Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 934.95' @ 12.46 hrs Surf.Area= 3,612 sf Storage= 5,731 cf Plug-Flow detention time= 139.2 min calculated for 0.103 af(46% of inflow) Center-of-Mass det. time= 74.8 min (840.7-765.9 ) Volume Invert Avail.Storage Storage Description #1 933.00' 26,686 cf Custom Stage Data(Prismatic) Listed below (Recaic) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 933.00 2,262 0 0 936.00 4,337 9,899 9,899 938.00 6,000 10,337 20,236 939.00 6,900 6,450 26,686 Device Routing Invert Outlet Devices #1 Primary 930.00' 15.0" Round Culvert L= 190.0' CPP, end-section conforming to fill, Ke= 0.500 Inlet/Outlet Invert= 930.00' /927.88' S= 0.0112 'P Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 934.80' 15.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Discarded 933.00' 0.450 in/hr Exfiltration over Surface area piscarded OutFlow Max=0.04 cfs @ 12.46 hrs HW=934.95' (Free Discharge) 3=Exfiltration (Exfiltration Controls 0.04 cfs) Primary OutFlow Max=0.75 cfs @ 12.46 hrs HW=934.95' (Free Discharge) t1=Culvert (Passes 0.75 cfs of 9.76 cfs potential flow) L2=Orifice/Grate (Weir Controls 0.75 cfs @ 1.27 fps) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 47 Pond INF1: INF-1 Hydrograph ��■■■ • • • • 0Inflow 4 9O cfs Outflow 111M11111.111;w Ara= 1 .5 .0 .. c ®Discarded ❑Primary MIIIMIIII 1110 r � �range 5, 31 �cf 4 i 1 v 3 3 1 ou. OA 2 le I i 1 i o 80 ds 1 1 ////////////////1///////// b ' ��/��///��/////////////r//////// .�-.�':' _.5` ✓ r,-Sd't r rl, A. s d.e "^:''�'`'', r^y4 �....n. s '� `t ,. 0 ///////////////////////////////// `ir'./ /////////////////// 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Pond INF1: INF-1 Stage-Area-Storage Surface/Horizontal/Wetted Area(sq-ft) 0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 6,000 6,500 Surface . . . I . . � . . i . . 1 . O Storage 939 i 938 // / cif% c 936 I Lu 935 1 1 11J 934J 1 ] ,1,1,?- .,.' - u-,4".,,,,,.,1,P41 'vv.,/ Custom Stage Data / / I / 933 , ( . , . 0 5,000 10,000 15,000 20,000 25,000 Storage(cubic-feet) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 48 Stage-Area-Storage for Pond INF1: INF-1 Elevation Surface Storage Elevation Surface Storage (feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet) 933.00 2,262 0 938.20 6,180 21,454 933.10 2,331 230 938.30 6,270 22,076 933.20 2,400 466 938.40 6,360 22,707 933.30 2,469 710 938.50 6,450 23,348 933.40 2,539 960 938.60 6,540 23,998 933.50 2,608 1,217 938.70 6,630 24,656 933.60 2,677 1,482 938.80 6,720 25,323 933.70 2,746 1,753 938.90 6,810 26,000 933.80 2,815 2,031 939.00 6,900 26,686 933.90 2,884 2,316 934.00 2,954 2,608 934.10 3,023 2,907 934.20 3,092 3,212 934.30 3,161 3,525 934.40 3,230 3,845 934.50 3,300 4,171 934.60 3,369 4,505 934.70 3,438 4,845 934.80 3,507 5,192 934.90 3,576 5,546 935.00 3,645 5,907 935.10 3,715 6,275 935.20 3,784 6,650 935.30 3,853 7,032 935.40 3,922 7,421 935.50 3,991 7,816 935.60 4,060 8,219 935.70 4,130 8,629 935.80 4,199 9,045 935.90 4,268 9,468 936.00 4,337 9,899 936.10 4,420 10,336 936.20 4,503 10,783 936.30 4,586 11,237 936.40 4,670 11,700 936.50 4,753 12,171 936.60 4,836 12,650 936.70 4,919 13,138 936.80 5,002 13,634 936.90 5,085 14,139 937.00 5,169 14,651 937.10 5,252 15,172 937.20 5,335 15,702 937.30 5,418 16,239 937.40 5,501 16,785 937.50 5,584 17,339 937.60 5,667 17,902 937.70 5,751 18,473 937.80 5,834 19,052 937.90 5,917 19,640 938.00 6,000 20,236 938.10 6,090 20,840 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 49 Summary for Pond INF2: INF-2 Inflow Area = 0.230 ac, 30.43% Impervious, Inflow Depth > 3.84" for 100-Year event Inflow = 1.69 cfs @ 12.12 hrs, Volume= 0.074 af Outflow = 1.21 cfs @ 12.18 hrs, Volume= 0.067 af, Atten= 28%, Lag= 3.8 min Discarded = 0.01 cfs @ 12.18 hrs, Volume= 0.007 af Primary = 1.20 cfs @ 12.18 hrs, Volume= 0.060 af Routed to Reach PR-TOT : PR-TOTAL Secondary = 0.00 cfs @ 5.00 hrs, Volume= 0.000 af Routed to Reach PR-TOT : PR-TOTAL Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 933.02' @ 12.18 hrs Surf.Area= 1,373 sf Storage= 829 cf Plug-Flow detention time=48.7 min calculated for 0.067 af(91% of inflow) Center-of-Mass det. time= 19.5 min ( 799.2 - 779.7) Volume Invert Avail.Storage Storage Description #1 932.00' 2,476 cf Custom Stage Data(Prismatic) Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 932.00 235 0 0 933.00 1,358 797 797 934.00 2,000 1,679 2,476 Device Routing Invert Outlet Devices #1 Primary 932.50' 15.0" Round Culvert L= 22.0' CPP, end-section conforming to fill, Ke= 0.500 Inlet/Outlet Invert= 932.50'/927.88' S= 0.2100 '/' Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Discarded 932.00' 0.450 in/hr Exfiltration over Surface area #3 Secondary 933.50' 5.0' long x 5.0' breadth EOF Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.34 2.50 2.70 2.68 2.68 2.66 2.65 2.65 2.65 2.65 2.67 2.66 2.68 2.70 2.74 2.79 2.88 Discarded OutFlow Max=0.01 cfs @ 12.18 hrs HW=933.02' (Free Discharge) L2=Exfiltration (Exfiltration Controls 0.01 cfs) Primary OutFlow Max=1.18 cfs @ 12.18 hrs HW=933.02' (Free Discharge) t1=Culvert (Inlet Controls 1.18 cfs @ 2.45 fps) Secondary OutFlow Max=0.00 cfs @ 5.00 hrs HW=932.00' (Free Discharge) '-3=EOF ( Controls 0.00 cfs) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Page 50 Pond INF2: INF-2 Hydrograph I � 0 Inflow 1169 cfs I ! Outflow Infllw Area= .20 ac ®DiscarPrimaded ❑ ry Weak Elev 933.02' Secondary j ! 121 = Storag =829 �Cf 111313 1 i I ! i 10 0 w 1 j o0 '1.'4 LL oao as /////////////////////////////////I ����/...... ///////////////////// 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Pond INF2: INF-2 Stage-Area-Storage Surface/Horizontal/Wetted Area(sq-ft) 0 200 400 600 800 1,000 1,200 1,400 1,600 1,800 2,000 0 Surface ' 0 Storage Y1 934 ! I ! ,1 /// � - /////// I /% ! o 933 w I • 'r ! 1 it 1 II I Custom Stage Data / r� ` / / / / / // 932 (. . �- (. . (( ( ( (( ( (( r r (( 0 200 400 600 800 1,000 1,200 1,400 1,600 1,800 2,000 2,200 2,400 Storage(cubic-feet) 24-07 -Alchemy Sound - OPH 2024-07-10 MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Eli Rupnow Printed 7/11/2024 HydroCAD® 10.20-2g s/n 12731 ©2022 HydroCAD Software Solutions LLC Paqe 51 Stage-Area-Storage for Pond INF2: INF-2 Elevation Surface Storage Elevation Surface Storage (feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet) 932.00 235 0 933.04 1,384 851 932.02 257 5 933.06 1,397 879 932.04 280 10 933.08 1,409 907 932.06 302 16 933.10 1,422 936 932.08 325 22 933.12 1,435 964 932.10 347 29 933.14 1,448 993 932.12 370 36 933.16 1,461 1,022 932.14 392 44 933.18 1,474 1,051 932.16 415 52 933.20 1,486 1,081 932.18 437 60 933.22 1,499 1,111 932.20 460 69 933.24 1,512 1,141 932.22 482 79 933.26 1,525 1,171 932.24 505 89 933.28 1,538 1,202 932.26 527 99 933.30 1,551 1,233 932.28 549 110 933.32 1,563 1,264 932.30 572 121 933.34 1,576 1,295 932.32 594 133 933.36 1,589 1,327 932.34 617 145 933.38 1,602 1,359 932.36 639 157 933.40 1,615 1,391 932.38 662 170 933.42 1,628 1,423 932.40 684 184 933.44 1,640 1,456 932.42 707 198 933.46 1,653 1,489 932.44 729 212 933.48 1,666 1,522 932.46 752 227 933.50 1,679 1,556 932.48 774 242 933.52 1,692 1,589 932.50 797 258 933.54 1,705 1,623 932.52 819 274 933.56 1,718 1,658 932.54 841 291 933.58 1,730 1,692 932.56 864 308 933.60 1,743 1,727 932.58 886 325 933.62 1,756 1,762 932.60 909 343 933.64 1,769 1,797 932.62 931 362 933.66 1,782 1,833 932.64 954 380 933.68 1,795 1,868 932.66 976 400 933.70 1,807 1,904 932.68 999 419 933.72 1,820 1,941 932.70 1,021 440 933.74 1,833 1,977 932.72 1,044 460 933.76 1,846 2,014 932.74 1,066 481 933.78 1,859 2,051 932.76 1,088 503 933.80 1,872 2,088 932.78 1,111 525 933.82 1,884 2,126 932.80 1,133 547 933.84 1,897 2,164 932.82 1,156 570 933.86 1,910 2,202 932.84 1,178 594 933.88 1,923 2,240 932.86 1,201 617 933.90 1,936 2,279 932.88 1,223 642 933.92 1,949 2,318 932.90 1,246 666 933.94 1,961 2,357 932.92 1,268 691 933.96 1,974 2,396 932.94 1,291 717 933.98 1,987 2,436 932.96 1,313 743 934.00 2,000 2,476 932.98 1,336 770 933.00 1,358 797 933.02 1,371 824 Appendix D: NRCS Soil Survey Map SITE " 'S £ ,. r^ ry , 'L` v�` k hr "b.!s a k ', .yam Hydrologic Soil Group—Washington County,Minnesota a (Alchemy Sound&Vision Site) il Pal 514280 514290 514300 514310 514320 514330 514340 514350 514360 514370 514380 514390 45°2.9'N F 45°2'9"N 36 60th St N 60th Q m i CT g09Gnttp E1)5 nog lbxa\Il&sl all fiihrigr w§TGGn 1 4 45°2'4"N 5°2'4'N 514280 514290 514300 514310 514320 514330 514340 514350 514380 514370 514380 514390 3 3 a Map Scale:1:723 if prated on A portal(8.5"x 11")sheet $ Metes °' N o 10 2) 40 60 °' Feet /V 210 0 35 70 140 Map projection:Web Mercator Comamorc1iiates:WGS84 Edge:UTM Zone 15N WGS84 U,SQA Natural Resources Web Soil Survey Page 1 of 4 7/8/2024 Conservation Service National Cooperative Soil Survey - - o 0 a) CuUa CO CV N a) 'p a)_ a) E n a 3 U 2 U U t0 a) 0 a) a) m -c f° m a ao 3 c d m c TO a a p a o m m N a) o c -orn2 a) Z .0 � = E w p o C0 a) coU W C O E O a) a U a f U N �'� `m E ca o c � af0ic m N o m E Z CO E co a) O_ co ° o Cu Cl) U) Cl) c U O Cu o as p c o O ao ° a) U CD cc) o ° =0 O cn U E w C Cu Z M C .c a) a N Z C N c a) Q p 3 Cu a) 0 ° ai a c Z o in -8 cn a 3 0 �-� � m o a � � � ° as G � o o 6 t � oa>> O a) -n3 U w ° p E o m o . m o Q (O N a p C a L as C n c v) .a IX o 17 ° E ° o m m ° 7-,1-' w ° ami ° v� m `D a? Q m 0 as > .c 0 C a) c o E >,E C ° 0 y o coi Cu a E aC E o ns o V1 0 0 0 ° c E a o a, a a) -u E a) Z `�' a c •-° °pL o o 2a o ° me m �, as Q O d Q' d O D U O U 4.-_ , c . N t0 a 0 Cu C o c aTipa ° U a) � � ona -o a) .c aai a, -0 ° wc > CO $ U U w in U 3 a_ O < m E Q Ew a m cc) o �, Cu tmCa O c EU O '.�N O ,., L" (a0 Cu O) w N Z o a ai m ° N 4? L] N (00 O •m y C Cu c m t. •• > 5 L m 0 i6 O)CO CV p m E O 'o cal ac) C o c 42 m, ( - 3a � U = o Q co : - •m Oa Q0 N p E >.E stn a� E _ as 8 3 -` a'i 2' D o o ca.co c �n E - o 1 o) ,DE 0 oi '- v 2 ° 'o c o 0 c . a; o a) ZQ ao Cu Laa o 'p O C a a7 U a) 7 a) - U > > >, a) O N -C - rn ..T ,,) -` C Q O) a) U U L a U U c ,- ,- a a) u) a) E o O O -Q O C co _C 7 ai c U) O U 20 p a) p CO O o -a U L 'p o -O to is rM .c E co L c 1- ‘- w E - o p a E u) � U 2 a=oQ R 1- '6 u) u) u) - o - H 8 -_ w C_ 2 C O T p O (f) O U C (n 0 o 'U m.a CO CO C 7--,.. 'al p (/) a �(;) -6 w Cum° o p E as > c >. s V a) oTO U U o v Cu wo 0 (n Q -0 W N N N O -- co 4 w O O L z U E cg O ce ce n. as m m L. E CC om O ❑ c w m c Ts y u , c8 2 o U ❑ z a in o ce __ ❑ 2 a Q 2 Q io c 0 3 4 m W J 2 a, a. a a1 N o 0 a o ,, Cu a, -- � c r2 a to a o o f a ❑ o ❑ c n o ❑ ❑ c a- ❑ ❑ a o) a a m m U U ❑ z o) a a m 0] 0 0 ❑ z o) < a m EO at c C c w w z ® . • E a)• a, L (A Q (/) O C a) . 3• U R O Z 0 Hydrologic Soil Group—Washington County,Minnesota Alchemy Sound&Vision Site Hydrologic Soil Group Map unit symbol Map unit name Rating Acres in AOI Percent of A01 1538 Santiago silt loam,2 to 6 B 1.5 61.2% percent slopes 342C Kingsley sandy loam,6 C 0.1 5.9% to 12 percent slopes 861C Urban land-Kingsley 0.8 32.8% complex,3 to 15 percent slopes Totals for Area of Interest 2.4 100.0% Description Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms. The soils in the United States are assigned to four groups(A, B, C, and D) and three dual classes(A/D, B/D, and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential)when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential)when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. USDA Natural Resources Web Soil Survey 7/8/2024 Conservation Service National Cooperative Soil Survey Page 3 of 4