Loading...
HomeMy WebLinkAbout2002-03-08 Drainage Calculations (Landform)DRAIN CALCULATIONS OAK PARK HEIGHTS, MN 36 & OSGOOD AVENUE WALGREEN'S SITE REVISED March 8, 2002 bt& re7,411 L LANDFORM FILE COPY MINNEAPOLIS •PHOEN TECIEOWE 01 2 1 002 510 FIRST AVENUE NORTH, SUITE 650, MINNEAPOLIS, MN 55403 (612) 252-9070 FAX/DATA: (612) 252-9077 81)01025 March 8, 2002 Drainage Analysis & Storm Sewer Narrative EXISTING ANALYSIS Oak Park Heights — Walgreen's The existing site consists of a funeral home with bituminous parking. Approximately 60% of the site (with 40% impervious area) drains to the east off the property into a drainage ditch that flows to the south. This storm water runoff continues south through storm sewer culverts under State Highway No. 36. The other 40% of the site (with 82% impervious area) drains to the south into the State Highway No. 36 Right -of Way. Currently, there is no water quantity or quality ponding on the site. There is an existing 18" storm sewer pipe that runs across the middle of the site from west to east and connects to a 30" storm pipe that flows south. The 30" storm pipe system runs south of the site and eventually outlets to a regional storm water treatment pond referred to as Perril Pond. This storm pipe system collects storm water run -off from a portion of the adjacent roadway, Osgood Avenue North (CSAH 24). It appears the 18" storm sewer pipe is not located within a drainage and utility easement. PROPOSED ANALYSIS The proposed site redevelopment includes collection of the on -site impervious and pervious runoff with concrete curb and gutter, catch basins, and storm sewer pipe. The sites overall drainage pattern will be revised to direct the on -site run -off into the existing storm sewer system described above that currently runs across the middle of the site. The 18" storm sewer pipe is currently located underneath the proposed building, therefore this existing pipe will be rerouted to the south of the proposed Walgreen's building. Due to the tight constraints of the site, on -site ponding is not feasible. To provide best management practices, an in -line storm water treatment structure (V2B 1) will be provided for storm water treatment at the end of our on -site storm sewer system. Even though the impervious area of the site is only increasing by 0.16 acres, the V2B 1 will be treating all of the proposed site's impervious run -off as well as the 0.90 acres of Osgood Avenue run -off. Field investigation and Washington County topography /aerial maps as attached determined the amount of storm water run -off draining into the 1 8" pipe from Osgood Avenue. A "drywell" manhole sized for storing the first 'A " of rainfall of the additional impervious area of the proposed site will be constructed after the V2B 1 system per direction of the watershed. Both of these structures are located prior to connection into the existing 30" storm sewer system described above. The appropriate calculations are attached. La;idforin 510 First Ave. N. Suite 650, Mprs, MN 55403 (612) 252-9070 Fax (612) 252- --9077 14 L�c-:<�.�: ?£..R "rx- �::,.w. r...... ._....: ':c� = a�a�cm .usr�.;:..:.�c:.: ...�� r..W- r=te =esc cry . JF SO1 oigu9t - pcb mad marisn Zr3A. MIMS - oori Zhid J.K314764 (J) 0 0 CO, ,01 HJ kTS *ON 'WV'S'D) z Site Walgreen's Proposed Project # SD01025 Existing Location Oak Park Heights, MN Preparer J. Taveggia Basin Existing Site Date 1131/2002 Land Use Description p Acres Per Practice e6e1ueoJed sioS y Percentage sips 8 Percentage Sip S 0 Percentage s 0 Product Residential: average lot size 5500 s.f., 65% impervious 0.04 77 85 90 92 CD o o a o a Residential: average lot size 11000 s.f., 38% impervious 1 61 75 83 87 Residential: average lot size 14500 s.f., 30% impervious Swamp with No Open Water 57 72 81 86 Residential: average lot size 22000 s.f., 25% impervious 0 54 70 80 85 Residential: average lot size 1 acre, 20% impervious 4.20 51 68 79 84 Residential: average lot size 2 acre, 15% impervious 47 65 76 82 Farmsteads 59 74 82 86 Streets and Roads: paved with curb and gutter Streets and Roads: gravel Streets and Roads: dirt 0.04 98 76 72 98 100% 85 82 98 89 87 98 91 89 3.4 0 Open Water Lakes or Ponds Storm #1 100 100 100 100 0 Swamp with 1/3 Open Water 1 85 85 85 85 0 Swamp with No Open Water 2.3 78 78 78 78 0 Cultivated Land: without conservation treatment Cultivated Land: with conservation treatment Pasture or Range Land: poor condition Pasture or Range Land: good condition Meadow: good condition Wood or Forest Land: thin stand, poor cover, no mulch Wood or Forest Land: good cover Open Space, Lawns, Parks, Golf Courses: good condition Open Space, Lawns, Parks, Golf Courses: fair condition Commercial and Business Areas (85% impervious) Industrial Districts (72% impervious) Paved Parking Lots, Roofs, Driveways Hydrologic Curve Number Com heet 0.48 0.21 1.36 72 62 68 39 30 45 25 39 49 89 81 98 81 71 79 61 58 66 100% 55 61 100% 69 92 88 100% 98 88 78 86 74 71 77 70 74 79 94 91 98 Landform, 510 First Avenue North, Suite 650, Minneapolis, MN 55403, Phone 612.252.9070, Fax 612.252.9077 91 81 89 80 78 83 77 80 84 95 93 98 0 0 0 0 0 26.4 0 14.49 0 0 133.28 2.09 IMMEEMENIEW Total Acres Product Total 177.57 Weighted Runoff Curve # 85 Storm #1 r Storm #2 Storm #3 Units Frequency 1 10 100 Year Rainfall 2.3 4.2 5.9 Inches Runoff Q 1.00 2.60 4.20 Inches Cultivated Land: without conservation treatment Cultivated Land: with conservation treatment Pasture or Range Land: poor condition Pasture or Range Land: good condition Meadow: good condition Wood or Forest Land: thin stand, poor cover, no mulch Wood or Forest Land: good cover Open Space, Lawns, Parks, Golf Courses: good condition Open Space, Lawns, Parks, Golf Courses: fair condition Commercial and Business Areas (85% impervious) Industrial Districts (72% impervious) Paved Parking Lots, Roofs, Driveways Hydrologic Curve Number Com heet 0.48 0.21 1.36 72 62 68 39 30 45 25 39 49 89 81 98 81 71 79 61 58 66 100% 55 61 100% 69 92 88 100% 98 88 78 86 74 71 77 70 74 79 94 91 98 Landform, 510 First Avenue North, Suite 650, Minneapolis, MN 55403, Phone 612.252.9070, Fax 612.252.9077 91 81 89 80 78 83 77 80 84 95 93 98 0 0 0 0 0 26.4 0 14.49 0 0 133.28 2.09 IMMEEMENIEW Total Acres Product Total 177.57 Weighted Runoff Curve # 85 Site Walgreen's Proposed Project # SD01025 Existing Location Oak r Preparer •• Basin , Existing Site Dr rr Drainage Area Runoff Curve Number Time of Concentration Rainfall Distribution Type Pond and Areas Spread Throughout Watershed Frequency Rainfall, P Initial Abstraction, la Compute l a!P Unit Peak Discharge, qu Runoff, Q Pond and Swamp Adjustment Factor, Fp Peak Discharge Qp Graphical Peak Discharge Am ON Tc Inch CFS 0.0033 85 0.25 l l 0.15 CSM / Inch 725 1.00 1.0 2.37 Square Miles Hours Percent of Am Landform, 650 Butler North Building, 510 First Avenue North, Minneapolis, MN 55403, Phone (612) 252 -9070, Fax (612) 252 -9077 0.08 j 0.06 775 800 2.60 4.20 1.0 6.58 1.0 10.97 Site Walgreen's Proposed Project # SD01025 Existing Location Oak Park Heights Preparer J. Taveggia Basin Existing Date 5/7/2001 Sheet Flow 3. Flow Length, L 5. Land Slope, s 6 Travel Time 7. Surface Description 8. Flow Length, L 10. Average Velocity, V 11. Travel Time Channel Flow 13. Wetted Perimeter, P 14. Hydraulic Radius 15. Channel Slope, s 17. Velocity 18. Flow Length, L 19. Travel Time . Surface Description 2. Mannings Roughness Coeff. n 4. Two - Year, 24 Hour Rainfall, P2 Shallow Concentrated Flow 9. Watercourse Slope, s 12. Cross Sectional Flow Area, a 16. Manning's Roughness Coeff., n Time of Concentration or Travel Time Segment ID Feet Ft/Ft Ft/Sec Hours Segment ID N/A SF Feet Feet Ft/Ft Ft/Sec Feet Hours bit. pavement N/A #DIV/0! 0.011 74 27 0.014 0.02 0.00 1 0.00 1 1 0.00 0 woodland N/A N/A #DIV/0! 0.4 130 2.7 0.131 0.23 0.00 0.00 1 1 0.00 0 Landform, 510 First Avenue North, Suite 650, Minneapolis, MN 55403, Phone 612.252.9070, Fax 612.252.9077 N/A N/A 0.00 0.00 0.00 1 1 1 0.00 0 #D IV101 0.25 0.00 N/A 20. Watershed or Subarea Time of Concentration 0.25 12 IN" 11 1M i r I MIN 105121 Efar4 l ara Sri' .41allik • ,. ' Ala wetj laW21211"1"""Mkat2--dr-'"iliall'7 \ \ • -. 1 .: ,..,..---- ,,.......,----'-,..,;,..- - -----fri -' --->--- ---- . \\ ----___ „„..----_ _ ........._......_....„..-- ___.- ,,,,,-;:,--_,---, :_„,:2-__...,;... • .. 1 W.. \ \‘\ -----'---.-----":"::::::- - =• 5-',.--- ,,:---E._///4._. ..., _ .„.,........ „„ ,,,.... - / ', ----- -- 7:::..- -: -.-:::'/ ,_........_ J d tk, Ili - ----------,,,, ,,,,,-- , r / ._ \ . . . 1 f • i. sIWON ,..,A,F, ' -... ,. : .1.A. : ':"....: .. • • . CO :1,41 1,,,. 7. -- , -,:■‘,.,,,,, ,C,,,,,,,,,,,,,,,,,,:•......,,,w.....,,,,,,,— .... i . ...... 1 ,I he, r,, •,,, -- N a4Pre.a 1 L. IV 1 0 c D 0 0 o ci) 0 .cc t.) 2.09 Total Acres Product Total 185.21 SD01025 Existing Weighted Runoff Curve # 89 Site Walgreen's Proposed Project # SD01025 Existing siioS 8 Location Oak Park Heights, MN Preparer J. Taveggia Basin Proposed Date Rev. 03/08102 Land Use Description p Storm #1 Acres Per Practice Percentage SIPS d Percentage siioS 8 Percentage SI!OS abaaueoied SI!oS 0 Product 100 Year Rainfall 2.3 4.2 5.9 Inches Cultivated Land: without conservation treatment Cultivated Land: with conservation treatment 1,30 3.00 72 62 Inches 81 71 88 78 91 81 0 0 Pasture or Range Land: poor condition Pasture or Range Land: good condition 68 39 79 61 86 74 89 80 0 0 Meadow: good condition 30 58 71 78 0 Wood or Forest Land: thin stand, poor cover, no mulch Wood or Forest Land: good cover 45 25 66 55 77 70 83 77 0 0 Open Space, Lawns, Parks, Golf Courses: good condition Open Space, Lawns, Parks, Golf Courses: fair condition 0.53 39 49 100% 61 69 74 79 80 84 32.33 0 Commercial and Business Areas (85% impervious) 89 92 94 95 0 industrial Districts (72% impervious) 81 88 91 93 0 Residential: average lot size 5500 s.f., 65% impervious Residential: average lot size 11000 s.f., 38% impervious Residential: average lot size 14500 s.f., 30% impervious Residential: average lot size 22000 s.f., 25% impervious Residential: average lot size 1 acre, 20% impervious Residential: average lot size 2 acre, 15% impervious Farmsteads 77 61 57 54 51 47 59 85 75 72 70 68 65 74 90 83 81 80 79 76 82 92 87 86 85 84 82 86 o © n o o Q o r Paved Parking Lots, Roofs, Driveways 1.56 98 100% 98 98 98 152.88 Streets and Roads: paved with curb and gutter Streets and Roads: gravel Streets and Roads: dirt 98 76 72 98 85 82 98 89 87 98 91 89 0 0 0 Open Water Lakes or Ponds Swamp with 113 Open Water Swamp with No Open Water 100 85 78 100 85 78 100 85 78 100 85 78 0 0 0 Other G •r. :;`:. ..... .� n - c.�'•' r,V+: .�•.r , .. -r.. .. . . -. <a, .... ,. . -. ..:..,.. ,�� = ^. sr rr _W ... ,:� • .... . ..w.... .n.�<,.. � ,.. a; >:�:•,. rC; =��:�:•. ,..... s... _.... �: � •r n..,..... ..,>..� ...... -.. ,...,.., ... ...... ... ..,_ .:. ............ .... ....._..._ . -Y. -. _ .: ... i': ... _.... _. ., _.,.. -w. r.. ...w ., ..7'.'. 0 0 .... n. . "%: ... . Hydrologic Curve Number Computation Sheet Landform, 510 First Avenue North, Suite 650, Minneapolis, MN 55403, Phone 612.252.9070, Fax 612.252.9077 Storm #1 Storm #2 Storm #3 Units Frequency 1 10 100 Year Rainfall 2.3 4.2 5.9 Inches Runoff Q 1,30 3.00 4.60 Inches Hydrologic Curve Number Computation Sheet Landform, 510 First Avenue North, Suite 650, Minneapolis, MN 55403, Phone 612.252.9070, Fax 612.252.9077 Site g r e en s osed Proposed p ....... ............................... Project # 5001025 Existing Location Oak Park Heights, MN Preparer J. Taveggia Basin . =:•r ' Proposed Date _ -r -, < • rte, Rev. 03/08/02 Drainage Area Runoff Curve Number Time of Concentration Rainfall Distribution Type Pond and Areas Spread Throughout Watershed Graphical Peak Discharge Am CN Tc 0.0033 89 0.21 0 Square Miles Hours Percent of Am Frequency Rainfall, P Initial Abstraction, la Compute la /P Unit Peak Discharge, qu Runoff, Q Pond and Swamp Adjustment Factor, Fp Peak Discharge Qp Inch Inch CSM 1 Inch Inch CFS 2.3 0,247 0.11 4.2 0.247 0.06 0.247 0.04 775 1 825 1 860 1,30 1.0 3.29 3.00 1.0 8.08 4.60 1.0 12,92 Year Storm #1 Storm #2 10 Storm #3 100 5.9 Landform, 510 First Avenue North, Suite 650, Minneapolis, MN 55403, Phone 612.252.9070, Fax 612.252.9077 Comments Downstream Structure 1 L9'S 0V9 1 5L:9 I z6 1 vE 195' 1 59'9 a enuI 902.15 L6'006 9Z'006 1.0'668 1.8'868 !.6'L69 99'L69 ''Z. 6 8 59'£68 0l 65'506 1 906.64 [ Et I 1 905.43 1 905.06 1 903.83 1 oo'5os I oo'sos I 1 900.30 Upstream Structure 1 MEI eu 1 L9'E LL' 9 Eu 1 09'9 I ss'9 1 zo 991 a eAuI 902.48 1 1 ZO'Z06 L9'006 eu C9'868 898.21 1 68'L68 1 897.56 i£168 '0'1 eut 1 _905.59 b9 eu _905.43 905.06 1 ss'£os l 1 905.00 00'906 a. c o Li. 0.. 0 0 ............ £'Z Z 1L'OE 1i; it7 1971. t- 1 L 9E • i- E'b c 9'8 6'8 6.C 9 0'91. a) T > 2 Q I 0 : �.'L )£'G )9 :9'9 C'0 X9'0 X9'0 1L'0 17J a) ry � 0_ 0 f z ��� 99' 09'0 89'9 9c'0 9C'0 99'0 oco 1 0Z a_ 0 Z1, Z6 81, Z 1.3 W ( ) C - 0 L . L . ti U 0'01. 0'01. 0'0t 0'9 8t 9 1 t'Z m 0 LL 0 U 111 II eu eu Z'Z 9'0 8't 1 Z 9'0 L... - `r a I II 111 W g g I 1111 III I 0'Zl. 6'.. 5'[.G 0'01, 8�0 I t'01, ,t 1 0 t i c : ) 1111111 I 6•0 6'0 6'0 6'0 6'0 6'0 0'I. OA, E 1.13 , 9E 5t i gt 06 L9 1 9L _6 L 6L 6L U3 Q Q -0 2 U Q < 5E'0 J o I H °° I 1060 � Ez'o 1 vo z1(7 o f oo 00'0 • a) 1..1, J eu Fi :71 LI Down- Stream Struct. 5 80J . 17 90 r E 80� s e� z 90 � 1.azn STMH1/ -� I HW X3 I Up- Stream Struct. ❑i 1 5 901 I t 901 1Offsite s 931 Z 8� L 831 1,aznI 1STMH C\4 . �-- Q a. CD 0 TO CD :41 co c Ca o ci o J co J � - x T . E o f p� co 0 o 650 BUTLER NORTH BUILDING 510 FIRST AVENUE NORTH Date: 03/08/02 PHONE: 612.252.9070 FAX: 612.252.9077 MINNEAPOLIS, MN 55403 STORAGE FOR 1/2 " OF RAINFALL OVER INCREASED IMPERVIOUS AREA STORMWATER VOLUME (BASED ON RATIONAL FORMULA) DRYWELL DESIGN 6' Dia MH/ 16,2' Build ADDNL IMP. SITE AREA (acres) A= RUNOFF COEFFICIENT C_ INFILTRATION RATE (in /hr) IR= DRYWELL INFILTRATION AREA (sf) IA1= DESIGN RAINFALL EVENT (IN) d= STORAGE VOLUME REQUIRED (CF) d *A= 0.26 0.90 0.5 468.0 ,0.5 i 471.9 HEIGHT PERFORATED MH Hi (feet)= 8.5 INSIDE MH RADIUS RI (feet)= 3 OUTSIDE MH RADIUS R2 (feet)= 3.58 HEIGHT STONE BELOW MH H2 (feet)= 2 OUTSIDE STONE RADIUS R3 (feet)= 5.6 P1= 3.141593 S TORAGE VOLUME PROVIDED (CF) WALGREEN'S OAK PARK HEIGHTS, MN SDOIO25 1 482.6