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Table 4.

The average rainfall, average annual yield and yield variations of different sub-watersheds of Yan Oya basin.

Basin hydrological attributes1234567
Catchment area (km2195.64 258.09 239.85 172.05 192.42 264.95 228.63 
Average annual rainfall (mm) 1,472 1,332 1,270 1,400 1,406 1,274 1,259 
Average annual discharge (MCM) 71.5 93.2 79.9 70.6 97.6 128.2 93.2 
Highest annual discharge (MCM) 244.9 257.6 148.7 156.9 218.5 433.9 324 
Lowest annual discharge (MCM) 16.5 29.5 32.7 23.7 32.2 19.7 13.8 
CV in annual discharge (%) 65 52 40 44 45 64 66 
Average annual run-off per unit area (MCM/km20.36 0.36 0.33 0.41 0.51 0.48 0.41 
Basin hydrological attributes1234567
Catchment area (km2195.64 258.09 239.85 172.05 192.42 264.95 228.63 
Average annual rainfall (mm) 1,472 1,332 1,270 1,400 1,406 1,274 1,259 
Average annual discharge (MCM) 71.5 93.2 79.9 70.6 97.6 128.2 93.2 
Highest annual discharge (MCM) 244.9 257.6 148.7 156.9 218.5 433.9 324 
Lowest annual discharge (MCM) 16.5 29.5 32.7 23.7 32.2 19.7 13.8 
CV in annual discharge (%) 65 52 40 44 45 64 66 
Average annual run-off per unit area (MCM/km20.36 0.36 0.33 0.41 0.51 0.48 0.41 
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