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A = 250 km2
P = 800 mm/yr
Q = 2 m3/s
Total volume of precipitation VP:
VP = 250 km2 × 800 mm/y × (1000 m/km)2 /
(1000 mm/m) = 200,000,000 m3/y
Total volume of runoff VR:
VR = 2 m3/s × 86400 s/d × 365 d/y = 63,072,000 m3/y
Abstracted percentage:
[(VP - VR) / VP] × 100 = 68.46% ANSWER.
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