Saturation excess runoff occurs after the filling of soil storage above a shallo

Question

Saturation excess runoff occurs after the filling of soil storage above a shallow water table. It is believed to be the dominant mechanism of runoff in humid environment with shallow water tables and flat topography. For a homogeneous soil profile, it could be shown that the depth of water to fill storage above a shallow water table is given as: where d is depth to water table. Requirements 1) Fit the Brooks-Corey empirical relationship in the range of water content between (assumed to occur at 0, m) and 8, br for layers 4, 5, and 7. 2) Plot, on the same graph, the soil storage in em of water versus depth to water table for d between 10 cm and 150 cm. Which soi your answer. l is more amenable to flooding and saturation excess runoff? Explain 3) Plot runoff depth versus depth to water for storms with 1, 2, and 5 inches of rain. Provide one plot for each soil. 4) What is the length of the overland flow plane generated by saturation excess runoff when the land slope is 0.5, 1.3, and 4 %. For each slope and soil, assume water table depth is at 10, 30, and 100 cm below land surface. Repeat the exercise for 1, 2, and 5 inches of rainfall depth.

Explanation / Answer

brooks morey model

for h<hb

Se=(h/hb)(lambda)

Kr=(h/hb)(-2-3*lambda)

for h<=hb

Se= 1

Kr =1

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