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The Study of Storm Drainage: the Analysis of Hydrographs

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In the study of storm drainage, the analysis of hydrographs is important. A hydrograph plots the river discharge as a function of time. Measurements are done at a certain point in a river. Rainfall is the input used to a watershed and the stream flow is also considered as the output of the watershed. A hydrograph also represents how a watershed reacts to rainfall. The response of a watershed to rainfall depends on several factors which affect the shape of a hydrograph. This represents the effect of rainfall on a particular basin.

This is a hypothetical response of a watershed to the input of rainfall. This will allow calculations of the response to any input(rainfall). Hydrographs are often affected by factors of soil saturation and surroundings. The vegetation type and the steepness of the surrounding lands, with the drainage density. Very dry weather, normally creates a crust on river beds and wet winters would increase the discharge. Sand and clay produce flashy hydrographs but there could be a difference between the two. Since we have already solved for the discharge of water in the river, we can now compare the discharge of water in the river with the discharge of water in the open channel.

The river will be able to supply water to the open channel. A pump will be required to lift water from the river to the open channel. The design of the pump will depend on the discharge of water in the open channel, as stated by Young and Freemen, 2000. The design load of the pump must be equal to the discharge of water in the open channel.

The design load of the pump that was computed is safe and would be able to draw water from the river to the open channel. With the computed load design of the pump which is 6.9927432733195HP, a 7.0 HP pump will be used. The water that is pumped to the open channel will not overflow. The amount of water will of constant volume as it reaches the reservoir in the nearby area.  

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