Here is a graphical view of the nonlinear runoff processes in InfoSWMM and SWMM5:
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1. Three runoff surfaces
a. Impervious with Depression Storage
b. Pervious
c. Impervious without Depression Storage
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2. Evaporation
a. Constant
b. Time Series
c. Monthly
d. Temperature
e. Climate File
f. Monthly Adjustments for Climate Change
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3. Slope (same for all runoff surfaces) |
4. Infiltration
a. Horton
b. Modified Horton
c. Green Ampt
d. Modified Green Ampt
e. Curve Number or SCS or CN
f. Monthly Adjustments for Climate Change for all Infiltration Methods
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5. Roughness (Manning’s n)
a. Impervious
b. Pervious
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6. Width or the Dimension of the Subcatchment (same for all runoff surfaces) |
7. Wind Speed for Snowmelt
a. Climate File
b. Time Series
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8. Depression Storage
a. Impervious
b. Pervious
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9. Temperature for Snowmelt
a. Climate File
b. Time Series
c. Monthly Adjustments for Climate Change
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10. Other conne
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