Storm Drainage Design Project Essay Example | Topics and Well Written Essays - 1500 words - 3

Storm Drainage stick out Project - Essay ExampleThe inf broken in into the river after the rainfall is through different ways. The major types ar overland flow which represents the surface flows which includes other direct flows into the river. The ground water flow component is the sub-surface outpouring component contributing to the river discharge from a particular region after the rainfall. If the major portion of overflow water reaches the river as overland flow , a heavy rainfall would result in fast(a) response in the river and the hydrograph shape would be peak. Thus the risk of floods would be higher in this case. darn if the major share is through ground water flow the rise in discharge is slow and the repose of the river is slower. Thus the rate at which the flood waters reaches the river body determines the shape of t he hydrograph. The major factors contributing to these situations are characteristics of drainage basin, type and amount of precipitation, land use pa ttern in a region, impact caused by human intervention, size and shape of drainage basin and major river prudence measures adopted (Flood hydrograph, n.d.).The hydrograph for river Cynon is drawn fored on the rainfall and river flow depth data (figure 1). The discharge in the river is plotted along y-axis and the time (in hours) along x axis. Similarly, the rainfall depth is indicated on a indirect y axis in the same graph corresponding to particular instant of time. Based on the flood hydrograph obtained for the river Cynon, it is obvious that the drainage characteristics of the terrain results in the occurrence of peak discharge soon after the rainfall. The drainage basin soil characteristics is said to have relatively low value of permeability and this results in low infiltration rates into the soil. The rising limb of the hydrograph has a very steep rise while the recess limb was not as steep. The receding limb required more time to reach the base flow condition which justif ied the