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A= 420 km2
P= 375 mm/yr
Q= 0.7 m3/s
Total volume of precipitation VP:
VP = 420 km2 × 375 mm/y × (1000 m/km)2 /
(1000 mm/m) = 157,500,000 m3/y
Total volume of runoff VR:
VR = 0.7 m3/s × 86400 s/d × 365 d/y = 22,075,200 m3/y
Abstracted percentage:
[(VP - VR) / VP] × 100 = 86% ANSWER.
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