Kan suksa kanchai nam nai lumnam Lam Pra Plerng.
1985
Kobkiat Pongput
It was found that the amount of water used for land preparation in wet season was about 250 nm. and percolation rate was about 1.04 nm./day in the pilot area of 142 rai. The average time for land preparation was about two weeks. Using storage water in the field at 50, 100 and 120 nm. for minimum, medium and maximum levels respectively the effective rainfall from the simulation could be divided into three groups: November-August, September and October groups. The irrigation efficiencies were 54 and 51% in wet and dry seasons, respectively. However, the efficiencies at 55% and 50% were assumed in the calculation of irrigation demand. A reservoir simulation model was used to calculate an average irrigable area in the dry season in 2 cases based on physical conditions of the reservoir surveyed in 1967 and 1983 where the condition in the latter case differed due to sedimentation. The area were found to be 3,000 and 2,000 rai (490 and 326 hectare) in the former and the latter case, respectively. The DSAR curves, derived from each case, could be used as a basis for determining the irrigated area in dry season in accordance with the water remaining after December in the reservoir. The average area during the dry season was 9,500 rai (1,550 hectare) when the target area was 20,000 rai (3,265 hectare) in the former case and was 5,000 rai (816 hectare) when the target was 15,000 rai (2,450 hectare) in the latter.
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