A catchment has 4 sub areas (see table below). The annual precipitation and evaporation from each of the sub areas are given below. Assume that there is no change in the groundwater storage on annual basis and calculate for the whole catchment the values of annual average A. Precipitation (Ans. P ave = 1105.167 mm) B. Evaporation (Ans. E ave = 532.416 mm) C. What are the annual run-off coefficients for the subareas and for the total catchment area as a whole? (Ans.ratio = 0.508)
A catchment has 4 sub areas (see table below). The annual precipitation and evaporation from each of the sub areas are given below. Assume that there is no change in the groundwater storage on annual basis and calculate for the whole catchment the values of annual average A. Precipitation (Ans. P ave = 1105.167 mm) B. Evaporation (Ans. E ave = 532.416 mm) C. What are the annual run-off coefficients for the subareas and for the total catchment area as a whole? (Ans.ratio = 0.508)
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
A catchment has 4 sub areas (see table below). The annual precipitation and
evaporation from each of the sub areas are given below. Assume that there is no change in
the groundwater storage on annual basis and calculate for the whole catchment the values
of annual average
A. Precipitation (Ans. P ave = 1105.167 mm)
B. Evaporation (Ans. E ave = 532.416 mm)
C. What are the annual run-off coefficients for the subareas and for the total
catchment area as a whole? (Ans.ratio = 0.508)
Transcribed Image Text:Sub-area
Area
Annual
Annual
PA
EA
Run-off = P - E
Runoff
Precipitation Evaporation
(Rainfall)
(mm)
(mm²)
coefficient =
(mm)
runoff/rainfall
A
10.7
1030
530
B
3.0
830
438
8.2
900
430
D
17.0
1300
600
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