cee5734_week5_2011

cee5734_week5_2011 - CEE 5734 Urban Hydrology and...

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Glenn E. Moglen Department of Civil & Environmental Engineering Virginia Tech The NRCS WinTR-20 Rainfall-Runoff Model CEE 5734 – Urban Hydrology and Stormwater Management Week 5
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Administrative Comments Questions Today – WinTR-20 Input basics Single sub-area Sub-divided system Interpreting output Plots and other features Detention basin design (time permitting) Today’s Agenda
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Define project settings This is first screen to appear when you start WinTR-20
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Choose “Sub-Area” See class demonstration for extra tools to specify: area, curve number and time of concentration.
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Choose “Storm Analysis”
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Control the Time Increment & Summary Output Default time step is generally not a convenient value – set to value of your choice. Click “Yes” for output from Sub- Area and Reaches to get summary peaks.
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Now SAVE the file! Must do this to get “Run” menu choice!
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Choose “Run” menu choice An output file appears: TR-20 peak: 527 ft 3 /s at 12.2 hours Compare to tabular method for this same problem (see last week’s slides): 379 ft 3 /s at 12.6 hours. What are the sources of differences?
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Differences between TR-20 and Tabular Method First difference: I a /P in last weeks example was 0.22
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This note was uploaded on 12/24/2011 for the course CEE 5734 taught by Professor Moglen during the Spring '11 term at Virginia Tech.

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cee5734_week5_2011 - CEE 5734 Urban Hydrology and...

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