HomeMy WebLinkAbout2001-04-20 Drainage CalculationsDRAINAGE CALCULATIONS
OAK PARK ILLIGHTS MN
WALGREEN'S SITE
AP
2001
LANDFORM
MINNEAPOLIS PHOENIX
FILE COPY
510 FIRST AVENUE NORTH, SUITE 650, MINNEAPOLIS, MN 55403 (612) 252-9070 FAX/DATA: (612) 252-9077
SD01025 April20, 2001
Drainage Analysis & Storm Sewer Narrative
The existing condition of the site is 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. 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. Landform is
currently working with the City of Oak Park Height's Engineering Consultant to
determine the outlet of this existing storm sewer system. It appears to collect 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.
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
18" storm sewer pipe 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. The appropriate
calculations are attached.
Landform
510 First Ave. N. Suite 650, Mpls, MN 55403
(612) 252 -9070 * Fax (612) 252-9077
Oak Park Heights — Walgreen's
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Site
1Nalgreen's
Preparer
J. Taveggia
Project #
SR98001
Date
Length
Ft.
4/19/2001
Location
Oak Park Heights, MN
Design Storm
Pipe
Cap.
CFS `
10
Page 1
Mannings n
0.011
0.013
Segment
Area
A
Acres
Runoff
0
Tc Tp Tc +Tp
Min. Min. Min.
Intensity
1
In /Hr
CB
Q
CFS
Pipe
Q
CFS
Length
Ft.
Pipe
Dia.
In.
Pipe
Material
Pipe
Slope
%
Pipe
V
Ft/S
Pipe
Cap.
CFS `
Excess
Capacity
CFS
From I To
_
CB 1 CBMH 2
0.04
0.79
10.0 1.0 11.0
5.60
0.18
0.18
120
12
RCP
0.20
2.0
1.6
1.4
CBMH 2 CBMH 3
0.60
0.88
11.0 mm 0.2 11.2
5.40
2.85
3.03
106
18
RCP
2.00
8.4
14.9
11.8
CBMH 3 CBMH 4
0.22
0.85
11.2 0.2 11.4
5.30
0.99
4.02
90
18
RCP
2.00
8.4
14.9
10.8
CBMH 4 CBMH 6
0.23
0.86
11.4 0.2 11.6
5.20
1.03
5.05
102
18
RCP
2.00
8.4
14.9
9.8
Roof Drain CBMH 5
0.34
0.90
10.0 0.2 10.2
5.60
1.71
1.71
33
10
PVC
0.50
3.4
1.8
0.1
CBMH 5 CBMH 6
0.13
0.90
10.2 0.8 10.9
3.50
0.41
2.12
154
12
RCP
0.55
3.4
2.6
0.5
CBMH 6 Exist. STMH
0.04
0.81
11.6 0.1 11.7
5.20
0.17
7.34
40
18
RCP
2.00
8.4
14.9
7.5
D
MINNEA.POLAS-PHOEN1X X
Storm Sewer Pipe Sizing
Landform Engineering Company 510 First Avenue North, Suite 650, Minneapolis MN, 55403 Phone 612.252.9070,
Fax 612.252.9077
Site
1Nalgreen's
Preparer
J. Taveggi
Project #
SR98001
Date
4/19/2001
Location
Oak Park Heights, MN
Design Storm
10
Page 1
Mannings n
0.013
t�
Upstream Structure
Struct Grate Invert Build
CB 1 906.58 903.08 3.50
CBMH 2 906.05 898.40
CBMH 3 904.78 896.18 8.60
CBMH 4 904.43 894.28 10.15
900,50
CBMH 5 905.18 900.24 4.94
Roof Drain
CBMH 6 905.78 885.00
Type Casting
27" Dia. R- 3250 -A
7.65 48" Dia. R- 1792 -FG
48" Dia. R- 1792 -FG
48" Dia. R- 1792 -FG
66" Dia. R- 3250 -A
20.78 48" Dia. R- 1792 -FG
Structure Design Information
Struct
Downstream Structure
Grate
Inlet Invert Build
CBMH 2 906.05 902.84 898.40 7.65
CBMH 3 904.78 896.28 896.18 8.60
CBMH 4 904.43 894.38 894.28 10.15
CBMH 6 mm 905.78 892.24 885.00 20.78
CBMH 5 905.18 900.34 900.24 4.94
CBMH 6 905.78 899.39 885.00 20.78
Exist. STMH 890.22 884.20 883.32 6.90
Comments
Incl. Osgood Ave. Runoff (Exist. 18 ")
Landform Engineering Company 510 First Avenue North, Suite 650, Minneapolis MN, 55403 Phone 612.25 2.9070,
Fax 612.252.9077