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cee5734_hw2_2011 - Virginia Tech Department of Civil and...

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1 Virginia Tech Department of Civil and Environmental Engineering CEE 5734 Urban Hydrology and Stormwater Management Homework #2: The SCS/NRCS Graphical Peak Discharge Method Due: February 2, 2011 This homework closes out the Rational Method calculations left over from the Homework #1 that were delayed until this week. This homework then introduces the student to SCS/NRCS methods: defining and making use of basic quantities such as the Curve Number ( CN ), Storage ( S ), Initial Abstraction ( I a ), Runoff( Q ), Travel Time ( T t ), Time of Concentration ( T c ), and Peak Discharge ( Q p ). The homework reinforces the calculations associated with developing a basin averaged CN value and to use the graphical peak discharge method. In all calculations students will demonstrate an appropriate understanding of significant figures. Left over from the Rational Method Area 1 Area 2 Area (acres) 6.1 8.3 Runoff coefficient 0.35 0.28 T c (minutes) 10. 15. Pipe 1-2 Pipe 2-3 Manning’s Roughness 0.025 0.028 Length (feet) 350 480 Slope (ft/ft) 0.0025 0.015 1.
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