WMS:Soil Type Runoff Coefficient Files

Like land use, soil type coverages/grids can be used to map model parameters. Tables with corresponding runoff coefficients, Green & Ampt parameters, or CASC2D values for different can be mapped. The CASC2D tables are the same as defined in the land use section. Runoff coefficient table definitions and examples are given in Figure 1 and Figure 2.

Figure 1. Soil Type Runoff Coefficient File Format

ID1, "Soil type description 1", RC1

ID2, "Soil type description 2", RC2

ID3, "Soil type description 3", RC3

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IDn, "Soil type description n", RCn

Figure 2. Sample Soil Type Runoff Coefficient File

1, "Highly impervious", 1.0

2, "Slightly pervious", .9

3, "Moderately pervious", .75

4, "Highly pervious", .5

Green & Ampt mapping file definitions and an example are given in Figure 3 and Figure 4.

Figure 3. Green & Ampt Soil Table File Format

ID1, "Soil type description 1", XKSAT1, RTIMP1, PCTEFFECTIVE1

ID2, "Soil type description 2", XKSAT2, RTIMP2, PCTEFFECTIVE2

ID3, "Soil type description 3", XKSAT3, RTIMP3, PCTEFFECTIVE3

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IDn, "Soil type description n", XKSATn, RTIMPn, PCTEFFECTIVEn

Figure 4. Sample Green & Ampt Soil Table File

19, "Gunsight-Cipriano complex, 1-7% Slope", 0.63, 50.0, 0.0

18, "Greyeagle-Suncity Variant complex, 1-7% Slope", 0.23, 50.0, 0.0

17, "Gachado-Lomitas-Rock outcrop complex, 7-55% Slope", 0.16, 50.0, 20.0

72, "Lehmans-Rock outcrop complex, 8-65% Slope", 0.09, 50.0, 30.0