Exercise 1: (2 marks)
There is a pool with base 6.1 m x 6.1 m. The height of the initial water level is 1.52 m. There
is a hole at the bottom of the pool. There were 10 days long precipitation, evaporation, and
water level measurement. How much is the daily volume of seepage?
Days
1
2
3
4
5
6
7
8
9
10
Evaporation (mm)
1.25
0
1.25
0
1.25
1.25
0
1.25
1.25
1.25
Precipitation (mm)
Water Level (cm)
152
2.5
5
10
132
Exercise 2: (2 marks)
In a catchment area, approximated by a circle diamater of 100 km, four rainfall stations are
situated inside the catchment area and one station is outside in its neigh-bourhood. Annual
precipitations recorded at the five stations in 1980 were provided. Determine the average
annual precipitation by the Thiessen- mean method.
Thiessen polygon area enclosing each station is identified. It may be noted that station 1 in this
problem does not have any area of influence in the catchment.
Station
Boundary of area
Area (km2)
Rainfall (cm)
1
2
3
4
5
abcd
dce
ecbf
fba
-2141
1609
2141
1963
85.0
135.2
95.3
146.4
102.2
Exercise 3: (2 marks)
The isohyets due to a storm in a cathment were drawn in following Figure and area of the
catchment bounded by isohyets were tabulated as below.
Isohyets (cm)
Area (km2)
Station 12
30
12.0 10.0
140
10.0 8.00
80
8.0 6.0
180
6.0 4.0
20
Estimate the mean precipitation due to storm.
Exercise 4: (2marks)
A soil has following characteristics f0= 1.0 in/hr; fc=0.40 in/hr; k= 0.5 hr -1.
Calculate:
a) Values of ” at t = 10 min, 30 min, 1 hr, 2 hrs, 4 hrs, and 8 hrs. (1 mark)
b) Total volume of infiltration over the 8 hour period. (1 mark)
Exercise 5: (2 marks)

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