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e BONBAR PLACE e
TR.55 - PRELIMINARY DETENTION ANALYSIS
Date: 11/2/00
Project No.: KAK.OO2
Project Description: BON BAR PLACE
County: Carmel, IN
Description Preliminary Detention Analysis
Basin ID: SITE I
Basin Area : 35.77 Acres
IWorksheet 2: Runoff curve number and runoff
Cover
5011 Type Group Description eN .,. Area CN x'" Area
PRE Soil B woods/grass- poor 73 36.00 2628.00
Soil C woods/grass. poor 82 12.00 984.00
Soil D woods/grass- poor 86 20.00 1720.00
Water Surface impervious 98 32.00 3136.00
100.00 8468.00
CN 85
POST Water Surface impervious 98 32.00 3136.00
Soil 8 residential<1/8 acre 85 34.00 2890.00
Soil C residential<1/8 acre 90 34.00 3060.00
100.00 9086.00
CN 91
2 yr . 24 hr 2.9
10 yr . 24 hr 4.2
100 yr . 24 hr 5.8
Sheet Flow segment ID
Flow Length (<300 ft) ( ft ) 300.00 71.00 PRE
Two year 24-hr rainfall 2.90 2.90
Land Slope (ft/ft) 0.026 0.014 0.372
Surface coeff. 0.150 0.150 22.32
Shallow concentrated flow
Flow Length ( ft ) 274.00 0.00
Slope (ft/ft) 0.026 0.010
(Paved / Unpaved) U p 0.029 Time (hrs) 0.00
Fh~ure 3.1 => Ave. Velocity ~ Lao 1.76 Time (mln) 0.00
Channel Flow
Cross Sec. Area ( ft^2 ) 1.00 3.14
Wetted Perimeter ( ft ) 1.00 6.28
Hydraulic Radius ( ft ) 1.00 0.50
Channel Slope ( ft/ft ) 1.000 0.010
Manning's Coeff. 1.000 0.013
Velocity (ftls ) 1.49 7.22 0.00
Flow Len h ft 0.00 658.00 0.00
PRE POST
Total Time (hrs) => 0.40 Time (hrs) 0.18
Total Time (mln) => 24.07 Time (mln) 10.54
Designed by EAG
Page 1
TR55in.xls
Table 4-1 =>
Exhibit 4-11I =>
Fi2ure 6-1 =>
Designed by EAG
e
SOHBAR PLACE
IWorksheet 4 . Graphical Peak Oischa rge method
fIlE
sq. ml
Drainage Area
Runoff Curve No.
Time of Concentration
Rainfall Distribution Type
Pond and Swamp areas
Frequency
Rainfall (24 hr) P
Initial abstraction la
Compute la/P
Unit Peak Discharge
Runoff, Q
Pond & Swamp adj. factor
'eak discharce
q (cfs)
IWorksheet 6a . Detention basin storage
Drainage area, Am
Design Storm
Peak inflow = Post lOO-year
Peak outflow = Pre 10-year
outflow / inflow
=> DETENTION REQUIRED =
STAGING OF POND =
SURF ACE AREA OF POND =
0.0559
85
0.40
II
2 YR Storm
hr
PRE
10 YR Storm
0.056 mi ^2
100 yr
252.00 cfs
87.48 cis
0.35
4.95
0.43
11.56
FT
AC
Page 2
e
f.Q.sI
0.0559 sq. ml
91
0.18 hr
II
POST
100 YR Storm 2 YR Storm 10 YR Storm 100 YR Storm
5.80 2.90 4.20 5.80 in
Q.1ll OdD ue ~ in
0.061 0.068 0.047 0.034
no &50 ~ ~ csmlin
4.08 1.97 3.20 4.75 in
1.0 1.0 1.0 1.0
100 YR Storm 2 YR Storm 10 YR Storm 100 YR Storm
143.68 93.40 cfs
Storage vol. I Runoff vol., Vs/Vr
Runoff, Q (from worksheet 2)
Runoff volume, Vr=Q*Am*S3.33
Storage volume, Vs=Vr*(Vs/Vr)
~
4.75 in
14.15 ac- ft
4.95 ac- ft
AC-FT
TR55in.xls
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