EXPERIMENTAL CONSIDERATION ON HEIGHT AND DISTANCE EFFECTS OF CONSECUTIVE DAMS IN HYDRAULIC FLOW

Check dams are small structures in order to decrease the slope of waterways, reduce flow rate and inhibiting erosion. Choosing the type of materials, dimensions, distance and height of these different factors, depends on tabs to the quarries, slope and dimensions of waterways, the amount of rainfall and the level of the bed materials in upper watershed. The right choice of materials, dimensions, distance and height tabs play an important role in reducing costs. Therefore, check the flow and scheduling behavior in dealing with obstacles such as check dams correcting mainly "to control the mountainous route in bed, according to the slope of the platform changes, their height and distances as a tracer that is discussed in this article. Considering that the behavior of the flow is a function of the depth of discharge, These tests have achieved on the flume with the length of 12.5 meters in variable slopes, discharges, heights and different intervals for consecutive walls in the lab. As well, the results have been discussed and analyzed for dimension-less ratios of the depth to the height(y/Hw), depth to the distance (y/L), Froude number and hydraulic factor (Cd), that led to the choice of the optimal distance and height of check dams.