Effects of hydraulic gradient Sample Clauses

Effects of hydraulic gradient. Short-term infiltration tests will tend to over-estimate long-term infiltration rates. The initial infiltration rate is significantly larger than the saturated hydraulic conductivity because the hydraulic gradient term is larger than one. As more water infiltrates, the gradient approaches a value of one and the infiltration rate approaches the saturated hydraulic conductivity. • If recharge or infiltration is sufficient to cause the wetting front to reach a regional or perched water table, the hydraulic gradient may drop to a value significantly less than one and the infiltration rate may be much less than the saturated hydraulic conductivity. This is a very important concept and one that is overlooked in design approaches in which infiltration rates are estimated solely on the basis of soil types or saturated hydraulic conductivity estimates. • The results of computer simulations demonstrate that, in highly permeable soils, assuming a hydraulic gradient of one is not a conservative estimate. Conversely, in low permeable soils, assuming a hydraulic gradient of one may be conservative.
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