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Run Offf Hydrology Essay

343 words - 2 pages

Infiltration is the movement of water into the soil under the driving
forces of gravity and capillarity, and limited by viscous forces
involved in the flow into soil pores as quantified in terms of
permeability or hydraulic conductivity. The infiltration rate, f, is the
rate at which this process occurs. The infiltration rate actually
experienced in a given soil depends on the amount and distribution
of soil moisture and on the availability of water at the surface. There
is a maximum rate at which the ...view middle of the document...

If rainfall intensity exceeds the ability of
the soil to absorb moisture, infiltration occurs at the infiltration
capacity rate. Therefore to calculate the actual infiltration rate, f, is
the lesser of fc or w. Water that does not infiltrate collects on the
ground surface and contributes to surface detention or runoff (Figure
35). The surface overland flow runoff rate, R, is the excess surface
water input that does not infiltrate.
R = w - f (28)
This is also often referred to as precipitation excess.
The infiltration capacity declines rapidly during the early part of a
storm and reaches an approximately constant steady state value after
a few hours (Figure 7). The focus of this section on at a point
infiltration models for calculating runoff is on how to calculate
runoff accounting for the reduction of infiltration capacity. We use
accumulated infiltration depth, F, as an independent variable and
write infiltration capacity as a decreasing function fc(F), then as F
increases with time fc is reduced. fc may be a gradually decreasing
function, or a threshold function, as in the case of saturation excess
runoff where there is a finite soil moisture deficit that can

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