|
Infiltration Fraction |
|
|---|---|
|
Conditions |
If Overland flow is simulated but unsaturated flow is NOT simulated. |
|
dialogue Type |
|
|
Fraction |
|
The Infiltration Fraction is the fraction of ponded water that infiltrates. It is used when the unsaturated zone is not explicitly simulated.
Normally the unsaturated zone simulation calculates the amount of infiltration from overland flow, since the amount of infiltration depends on the water content of the upper most soil horizon. If the soil is saturated, then the infiltration will be low. If the soil is very dry, then the infiltration could be very high.
However, the Net Infiltration Fraction is a stationary variable. The only way to simulate the dynamic changes in the amount of infiltration is to simulate the unsaturated zone.
Note When MIKE Hydro River is used in MIKE SHE, overland flow must always be included. If you want to simulate strictly saturated flow coupled to MIKE Hydro River, then you will need to use the Infiltration Fraction instead of the unsaturated flow.
The net recharge to the groundwater table, Rnet, is
where Prec is the actual precipitation, Rainfallnet is the Net Rainfall Fraction, and Infilfrac is the Infiltration fraction.
Related Items
· Precipitation Rate (V1 p. 230)
· Net Rainfall Fraction (V1 p. 232)
