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Storm Drainage Design Project - Case Study Example

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This paper "Storm Drainage Design Project" discusses the effects of different land management practices on water economy of drainage areas. It is necessary that the stream-hydrograph that is obtained from drainage areas be separated into ground-water flow…
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Storm Drainage Design Project
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Download file to see previous pages The improvement of the present methods and the development of new methods for the differentiating ground-water run-off and the surface run-off has been specifically pointed out as one of the deficiencies in hydrologic precipitation and other measurements that are essential to watershed studies are obtained from drainage areas that are supporting continuous streamflow and ranging in size.

The flood hydrograph is a plot of river discharge, usually a line graph over time. Rainfall is also plotted over time in the form of a bar graph. There are factors that control the shape of hydrographs. The typical shapes are shown and the main components are labeled (Weyman, 1975). A hydrograph tells the difference between the peak rainfall from the peak discharge. The difference is termed as lag time. When the lag time is greater, there is a lesser chance of flooding. A short lag time indicates that water had reached the river channel quickly. The rising limb is the rise in discharge shown on the graph, while the falling limb is the decrease in the discharge. There are factors that affect flood hydrograph. Large areas of basins receive more precipitation than small ones and therefore have a larger runoff. A larger size would mean longer lag time as water has a longer distance to travel to reach the trunk river. The shape of the basin, (according to Gillesania, 2006), typically the elongated basin produces a lower peak flow and longer lag time than a circular one with the same size. The elongated basin will produce a lower peak flow and longer lag time than a circular one of the same size. The slope has a very important effect. Channel flow will be faster down a steep slope, producing a steeper rising limb and shorter lag time. Permeable types of rocks would mean rapid infiltration and little overland flow thus producing a shallow rising limb. Since the soil is one important factor, infiltration is generally greater on thick soil, although clay acts as an impermeable layer. If there is more infiltration, longer lag time occurs and shallower rising limb. ...Download file to see next pagesRead More
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