Estimate the infiltration rate with philips equations

Reference no: EM133191748 , Length: Word count: 2 Pages

Problem 1: Philip's Infiltration Equations

In a field measurement of infiltration over a pasture area using a ring infiltrometer, the following recording was made: water level in the infiltrometer dropped 1.0 inch after the first hour; dropped an additional 0.5 inch during the second hour. Note that infiltration rate constantly changes with time, and evaporation is negligible. Assuming Philip's Equations apply, estimate the infiltration rate (in inches/hour) at the end of the third hour.

Problem 2: Green-Ampt Infiltration Model

A rainstorm of constant intensity produces 1.6 cm of rainfall in two hours on a loam soil (porosity η = 0.55, hydraulic conductivity K = 0.1 cm/hr, and wetting front soil suction head ψ = 20 cm). The soil moisture content prior to the storm θi is 15%.

a) Compute the cumulative infiltration F and the infiltration rate f at t = 1 hour.

b) Calculate the cumulative infiltration F, infiltration rate f, and cumulative excess rainfall (or surface runoff) at the end of the storm (i.e., at t = 2 hours)?

Problem 3: SCS Method for Direct Runoff

a) Compute the runoff from a 7-in rainfall on a 1500-acre watershed that has hydrologic soil groups that are 40 percent group A, 40 percent group B, and 20 percent group C interspersed throughout the watershed. The land use is 90 percent residential area that is 30 percent impervious, and 10 percent paved roads with curbs. Assume AMC II conditions.

b) What was the runoff for the same watershed and same rainfall before development occurred? The land use prior to development was pasture and range land in poor condition.

Reference no: EM133191748

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