Research Article
Assessment of Surface Runoff for Tank Watershed in Tamil Nadu Using Hydrologic Modeling
Table 5
Computation of irrigation demand for paddy for the year 2008-09.
| | Item | Month | | September | October | November | December | January | February | Season |
| | Percentage of annual daytime hours, | | 0.26 | 0.27 | 0.26 | 0.27 | 0.27 | | Average Temperature
(°C) | | 26.00 | 24.80 | 24.60 | 25.8 | 27.80 | | Potential evapotranspiration
(mm/day) | | 5.19 | 5.14 | 5.02 | 5.27 | 5.61 | | Crop coefficient
| | 1.10 | 1.10 | 1.20 | 1.30 | 1.00 | | | Crop water requirement | | | | | | | | | mm/day | | 5.71 | 5.66 | 6.03 | 6.84 | 5.61 | | | mm/month | | 171.26 | 175.38 | 186.82 | 191.65 | 174.00 | | | SAT, mm | 200.00 | | | | | | | | PSL, mm/month @4 mm/day | | 120.00 | 124.00 | 124.00 | 112.00 | 124.00 | | | WL, mm | | | | | | | | | , mm | 48.60 | 499.80 | 167.80 | 0.00 | 0.00 | 0.00 | | | Irrigation demand, mm | 151.40 | 0.00 | 131.58 | 310.82 | 303.65 | 298.00 | 1195.45 |
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