2. Assume that a rainfall event of intensity 2.25 cm/h falls over a uniformly fo

Question

2. Assume that a rainfall event of intensity 2.25 cm/h falls over a uniformly forested watershed of area 20 km2.
If the only water losses during this event are those due to interception, that is, there is no infiltration and no surface
depression storage, compute the volume of water that leaves the basin as storm runoff for a 30-min and a 105-min
rainfall, using the two models presented in class and whose equations are repeated below. Assume that K is 1.5, S is
0.2 cm and that the evaporation rate E is 0.05 cm/h.


Model A:
Li =
h if h < S
S + KEt otherwise

where h is the total storm depth and Li is volume of interception per unit area.


Model B: Interception volume Li as a function of precipitation volume P is given by,
Li = S(1? e?P/S )+ KEt



3. Repeat Problem 2 but assuming that in addition to interception there are also losses due to depression
storage. The depression storage equation is:
V = Sd (1? e?Pe /Sd )
Assume that Sd is 0.2 cm. What is the runoff ratio for these conditions? How much runoff would have been produced
halfway into the storm?

I know how to do all but the last two questions to this problem:What is the runoff ratio for these conditions? How much runoff would have been produced halfway into the storm? Please help

Explanation / Answer

Li = S(1? e?P/S )+ KEt May i know what these Question mark means.???

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