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A= 255 km2
P= 780 mm/yr
Q= 1.95 m3/s
Total volume of precipitation VP:
VP = 255 km2 × 780 mm/y × (1000 m/km)2 /
(1000 mm/m) = 198,900,000 m3/y
Total volume of runoff VR:
VR = 1.95 m3/s × 86400 s/d × 365 d/y = 61,495,200 m3/y
Abstracted percentage:
[(VP - VR) / VP] × 100 = 69.08% ANSWER.
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