cee5734_week12_2011

cee5734_week12_2011 - CEE 5734 Urban Hydrology and...

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Glenn E. Moglen Department of Civil & Environmental Engineering Virginia Tech Modeling Water Quality in SWMM - Mechanics CEE 5734 – Urban Hydrology and Stormwater Management Week 12
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Questions Comments on Calibration Relative proportion between evaporation and streamflow Water Quality in SWMM Land Use Buildup functions Washoff functions Source water concentrations Occoquan System Example Homework Assignment Discussion Today’s Agenda
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What are some problems with calibration approach? Data source Model User Comments on Calibration
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The Hydrologic Cycle – General Magnitudes
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The Hydrologic Cycle – Another Perspective
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So for Calibration in SWMM… “Tune” the Upper Evap. Fraction Recommendation: adjust “Upper Evap. Fraction” up/down until total simulated inflow is approximately 40% of the total precipitation volume. Dev. Vol. should be small.
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Proportions for Tinker Creek For 10/1/2008 – 9/30/2009 Observed precipitation: 32.64 inches Observed streamflow: 9.36 inches Thus: Streamflow is 28% of precipitation Evaporation is 72% of precipitation Note result deviates from previous slides. Previous slides represent long-term
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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_week12_2011 - CEE 5734 Urban Hydrology and...

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