Geoscience Reference
In-Depth Information
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PROBLEMS
12.1
(a) Derive the 1 h unit hydrograph from the 2 h unit hydrograph given in Table 12.1. (b) Calculate
the runoff in
cm h
−
1
x
=
15 mm h
−
1
resulting from the following pattern of excess rainfall:
for 0
<
t
<
1h;
x
=
25 mm h
−
1
for1<
t
<2h;and
x
=
39 mm h
−
1
for2<
t
<3h.
12.2
The table lists a storm runoff hydrograph resulting froma4hstorm of presumably uniform
(in space and time) but unknown intensity on a basin of 29.5 km
2
. (a) Construct the S hydrograph,
and determine the intensity of the storm rainfall (in cm h
−
1
) from the (smoothed) equilibrium flow