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A= 124 km2
P= 250 mm/yr
Q= 0.25 m3/s
Total volume of precipitation VP:
VP = 124 km2 × 250 mm/yr × (1000 m/km)2 /
(1000 mm/m) = 31,000,000 m3/yr
Total volume of runoff VR:
VR = 0.25 m3/s × 86400 s/d × 365 d/yr = 7,884,000 m3/yr
Abstracted percentage:
[(VP - VR) / VP] × 100 = 74.6% ANSWER.
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