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(a) The Horton's initial infiltration capacity for a catchment is 204 mm/h and the constant infiltration value at saturation is 60 mm/h. For a rainfall in excess of 204 mm/h maintained at this rate for 50 minutes, the infiltrated volume was observed to be 50.6 mm. Determine the value of k in Horton's equation.
(b) Soil infiltration characteristics (based on Horton's equation) and an observed 4-hr duration rainfall values for a 100 ha parkland catchment are given below:
fo = 15 mm/hr, fc = 5.0 mm/hr, k=0.6 hr-1
Duration
0 - 1 hr
1 - 2 hr
2 - 3 hr
3 - 4 hr
Rainfall
in mm
17.5
12.5
15
7.5
i. Calculate the total depth of infiltration
ii. What is the total volume of runoff in m3 for the observed rainfall
iii. Estimate f index of the catchment
Mean Absolute Deviation To avoid the problem of positive and negative deviations canceling out each other, we can use the Mean Absolute Deviation which is given by
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simplified formulae
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