From Mays 2011 Ground and Surface Water Hydrology See tabulated values in Mays Table 881 Example A watershed has 40 residential 14 ac lots 25 open space good condition 20 commercial and business 85 impervious and 15 industrial 72 impervious with corresponding soil groups of ID: 536170
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Slide1
SCS Dimensionless Unit Hydrograph
From Mays, 2011, Ground and Surface Water Hydrology
See tabulated values in Mays Table 8.8.1Slide2
Example
A watershed has 40% residential (1/4 ac lots), 25% open space (good condition), 20% commercial and business (85% impervious) and 15% industrial (72% impervious) with corresponding soil groups of C, D, C and D. What is the depth of runoff from 6 in of rain
Assume the rainfall occurs in a pattern of 2 in in first hour, 3 in in second hour and 1 in in third hour determine the rainfall excess hyetographAverage slope is 3%, Area is 3 mi
2
, hydraulic length is 1.2 mi.
Determine the SCS unit hydrograph. What is the direct runoff hydrograph from the rain used earlierSlide3
Kinematic Wave Overland Flow
From Mays, 2011, Ground and Surface Water HydrologySlide4
Combination of
hillslope
elements into a distributed hydrologic model
From Mays, 2011, Ground and Surface Water Hydrology