There is slight difference of each environment. By making the water eroded the sand in front of the pier and back with 1% slope at .Concrete column flow, slope 2% at 1, 2 and 3% slope flow flow at the flow and slope 3 more to make the area of the sand around the water column will be blow to make the depth of the sand around it are deep and wide.Distance around the column respectively of the flow and slope.After the trial, all three cases we The water flow is not able to flow through. What khwangkrasae with water flow as normal. Cause sand erosion under the lead around obstructions that cause of the floor. Specifically, the case is undershot weir. Water can flow through the difficult with the variable speed of the water, and slopes in the area, the water must flow through under the weir.Erosion (erosion), and a wide area, and deepen, which depending on the slope and speed of the water.
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