Runoff Curve Number Calculations and ComparisonU
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0.25 AC
LOT 1
5.86 ACLOT 3
14.56 AC
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0.39 AC
OFF-E
0.41 AC
DIR-N 0.17 AC
DIR-S 1.22 AC
DEV
13.99 AC
FUT DEV
5.86 AC
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Basin Type of Cover/ Percent Weighted
Name A B C D Condition of Cover of Basin A B C D CN
DEV 0% 0% 39% 61% Impervious (Pond Area) 8% 98 98 98 98 98.0
0% 0% 39% 61% Commercial 70% 89 92 94 95 94.6
0% 0% 39% 61% Open Space, Good Cond. 22% 39 61 74 80 77.7
DEV 100%91.2
FUT DEV 0% 0% 48% 52% Commercial 90% 89 92 94 95 94.5
0% 0% 48% 52% Open Space, Good Cond. 10% 39 61 74 80 77.1
FUT DEV 92.8
OFF-N 0% 80% 20% 0% Impervious 2% 98 98 98 98 98.0
0% 80% 20% 0% Open Space, Good Cond. 98% 39 61 74 80 63.6
OFF-N 64.3
OFF-E 0% 70% 30% 0% Impervious 12% 98 98 98 98 98.0
0% 70% 30% 0% Open Space, Good Cond. 88% 39 61 74 80 64.9
OFF-E 68.9
Weighted Curve Project:Michigan Road Site
Number Calculations Date:6/29/2018
Prepared By:TPG
Soil Group % Curve Number (CN)
Job No.:W17-0567
Proposed Conditions Checked By:KCS
WinTR-55 Current Data Description
--- Identification Data ---
User: ShortJ Date: 7/31/2019
Project: 70050012 - CBA Carmel Units: English
SubTitle: Stormwater Runoff Calculations Areal Units: Acres
State: Indiana
County: Hamilton NOAA_A
Filename: P:\70050012\WIP DRAWINGS\Civil\Calcs\TR-55 Stormwater Runoff Data - Drainage Area and Total Property.w55
--- Sub-Area Data ---
Name Description Reach Area(ac) RCN Tc
------------------------------------------------------------------------------
CBA SITE PROPERTY AREA Outlet 1.23 91 .145
Total area: 1.23 (ac)
--- Storm Data --
Rainfall Depth by Rainfall Return Period
2-Yr 5-Yr 10-Yr 25-Yr 50-Yr 100-Yr 1-Yr
(in) (in) (in) (in) (in) (in) (in)
--------------------------------------------------------------------------------
2.85 3.53 4.06 4.81 5.4 6.02 2.37
Storm Data Source: Hamilton NOAA_A County, IN (NRCS)
Rainfall Distribution Type: Type II
Dimensionless Unit Hydrograph: <standard>
WinTR-55, Version 1.00.10 Page 1 7/31/2019 1:45:27 PM
ShortJ 70050012 - CBA Carmel
Stormwater Runoff Calculations
Hamilton NOAA_A County, Indiana
Sub-Area Land Use and Curve Number Details
Sub-Area Hydrologic Sub-Area Curve
Identifier Land Use Soil Area Number
Group (ac)
--------------------------------------------------------------------------------
CBA SITE Open space; grass cover > 75% (good) D .5 80
Paved parking lots, roofs, driveways D .73 98
Total Area / Weighted Curve Number 1.23 91
==== ==
WinTR-55, Version 1.00.10 Page 1 7/31/2019 1:45:27 PM