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Supplemental Materials - Storm Drainage Memorandum
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Supplemental Materials - Storm Drainage Memorandum
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Last modified
7/3/2024 1:50:59 PM
Creation date
7/3/2024 1:50:23 PM
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Template:
PDD_Planning_Development
File Type
PDT
File Year
24
File Sequence Number
1
Application Name
BRAEWOOD HILLS 3RD ADDITION
Document Type
Supplemental Materials
Document_Date
7/2/2024
External View
Yes
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Braewood Hills Runoff Detention <br />2-Year Storm <br />Post-development <br /> 12/18/2023 <br /> Subbasin : BasinL4 <br /> Input Data <br />Area (ft²) ......................................................................... 88339.00 <br />Impervious Area (%) ...................................................... 20.00 <br />Impervious Area Curve Number .................................... 98.00 <br />Pervious Area Curve Number ........................................ 76.00 <br />Rain Gage ID ................................................................. 2-Year <br /> Composite Curve Number <br /> Area Soil Curve <br />Soil/Surface Description (ft²) Group Number <br />Composite Area & Weighted CN 88339.00 80.4 <br /> Time of Concentration <br />Subarea Subarea Subarea <br />Sheet Flow Computations A B C <br /> Manning's Roughness : .4 0.00 0.00 <br /> Flow Length (ft) : 369 0.00 0.00 <br /> Slope (%) : 15 0.00 0.00 <br /> 2 yr, 24 hr Rainfall (in) : 3.12 0.00 0.00 <br /> Velocity (ft/sec) : 0.22 0.00 0.00 <br /> Computed Flow Time (min) : 27.61 0.00 0.00 <br />Subarea Subarea Subarea <br />Shallow Concentrated Flow Computations A B C <br /> Flow Length (ft) : 100 0.00 0.00 <br /> Slope (%) : 10 0.00 0.00 <br /> Surface Type : Grassed waterway Unpaved Unpaved <br /> Velocity (ft/sec) : 4.74 0.00 0.00 <br /> Computed Flow Time (min) : 0.35 0.00 0.00 <br />Total TOC (min) ..................27.96 <br /> Subbasin Runoff Results <br />Total Rainfall (in) ............................................................ 3.11 <br />Total Runoff (in) ............................................................. 1.43 <br />Peak Runoff (cfs) ........................................................... 0.45 <br />Weighted Curve Number ............................................... 80.40 <br />Time of Concentration (days hh:mm:ss) ........................ 0 00:27:58
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