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Published byMargery Joseph Modified over 9 years ago
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RunoffRunoff Creating a spatially explicit runoff grid
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Goal Create a grid based surface in which each cell represents runoff transport Used for estimating streamflow Loadings and concentrations of water quality Driving factor in equations
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http://www.prism.oregonstate.edu/
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ASCII to Raster
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Defining a projection for the precip grid
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Regression relationship For 5 gauging stations located within the Cheat and Tygart Drainage Basins (vicinity of study area) I found 30yr average annual precip and 30yr annual depth of stream flow - both values were in mm. Best fit was: Depth of streamflow in mm = (.655474) * annual precip total in mm
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Runoff grid
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Now for cumulative annual runoff Part APart B
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Cumulative runoff
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Streamflow from cumulative runoff We multiply cu_runoff2 (which is in m 3 per year) by the number of cubic feet per cubic meter (35.2875) and divide by the number of seconds per year (31557600). For result called est_flow will have the 30yr annual average flow in cfs.
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Estimated flow
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Flow for stream cells only
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Checking the value to the gauge
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421 cfs for 30yr annual gauge average compared to 471 modeled (within 89%)
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Questions / Comments?
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