(b) For the last 80 years, the average annual rainfall for the Trident River cat
ID: 296297 • Letter: #
Question
(b) For the last 80 years, the average annual rainfall for the Trident River catchment was 800 mm, the average annual potential evapotranspiration was 1,100 mm and the average annual runoff from the catchment was 150,000 ML. The Trident River catchment area is 500 km2 (i) What was the average annual runoff depth in mm? (2 marks) (ii) Estimate the runoff coefficient (also known as the runoff ratio). (iii) Estimate the average annual actual evapotranspiration in mm iv) What assumption did you make in answering (ii)? (1 mark) (1 mark) (1 mark)Explanation / Answer
(i) Average Annual Runoff depth is 30 cm
[(150000 x 106 x 100) / 103 x 500 x 106]
(ii) Q=CxIxA
C=150000 x 106 / 500 x 800 x 106
=.3
(iii) P - R= E
80 - 30= 50cm
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