2. In the design of a borehole, the radius of influence R cannot be established precisely and, therefore, is commonly assumed to be 200 m. For a well of radius, rw 250 mm and transitivity T= 0.0208 s1 that is to supply 15 m/hr, determine: i. Drawdown below which the pump must be placed ii. The percentage error in drawdown if the correct radius of influence was 300 m. 2.72TZW Assume the borehole yield Q) %3D log. R /r

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Highway Drainage

Highway drainage is the process of extracting and regulating the excess surface water on the pavement by giving the desired slope. The construction of a highway drain helps to divert the water present on the surface, and sub-grade by the means of slope. Highway drainage systems are a necessary part of smooth functioning of traffic, since the highway drainage systems provide proper disposal of unwanted substances from the highways.