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Chao Phraya River basin is a large country. An area of about 160,000 sq. Km, or one in three of the country's main economic areas. 2554 flood damage is very much in the year 2554 peak through Nakhon Sawan, 4,680 cubic meters / second, but the river can drain 3,200 cubic meters / second. The small river in Ayutthaya is approximately 1,300 cubic meters / second. Canal water diversion is one of the interesting option. Because the problem is resolved to the point. But it must be the starting point and the right size. Therefore, the study of the condition of the flood water diversion by the year 2554, it is an interesting case study used a mathematical model to study the events Infoworks RS 2551 to calibrate the models used. Year 2554 to test the model and application. The calibrated model to change the water as runoff PDM found that the variable rainfac be Cmax of the drainage basin on the 1.193 4.629 and 101.834, respectively calibration coefficients rough water found in the river in between. 0.025 to 0.033 in the river is between 0.028 to 0.035 and that the diversion of water from a well. With a difference one side and two side water diversion would result in a level difference between the seven case studies: 1) water diversion East 400 cubic meters / second 2) water diversion East 1,000. . m / sec. 3) water diversion along the west bank of the Ping River - Mae Klong 1,200 cu.m / sec 4) diversion East Coast and West Coast 400 and 1200 m / s, respectively 5) water diversion. East Coast and West Coast 1,000 and 1,200 cubic meters / second, respectively 6) diversion East Coast. And west along the Ping River - Marine size volumes of excess water and 7) diversion East Coast. And the west side of the river Ping River to the sea With the volume of excess water. The diversion canal is used to determine the soil trapezoid-shaped cut. The slope side 1: 1.5, the slope of the canal. Regardless of soil properties and land prices. The study found that the size of the diversion of excess water volume in 2554 was the diversion of the river west of the Ping River to 380 cubic meters / second over the Ping River to the Sakae Krang River 1400 -. 1780 cubic meters / second, the Sakae Krang River. To point out the 1700-2070 cubic meters / second, the diversion East Coast throughout the length 1130 cubic meters / second, with the diversion of flood water levels were up in all provinces fell apart. as well as case studies in the area Sawan 1-7 0.00 0.00 0.28 0.28 0.29 0.55 and 0.84 meters, respectively, in Ayutthaya. In the case of the 1-7 0.02 0.05 0.05 0.02 0.06 0.47 and 0.47 meters respectively.
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