SOIL SCIENCE 322Problem Set #6April 3, 2008Due April 10, 20081.From problem set number 5 you determined, and were given information thatindicated, that the water table of soil was between 23 and 45 cm below the surfaceof a soil. Assume this soil has a restrictive layer at 200 cm and the average depthto the water table is 34 cm. Using this information and the computer program onthe class web page called DRAIN or the one on NRCS’s web site determine thespacing of subsurface drains if you are to grow a crop with a rooting depth of 100cm for the following situations: 1)If this is the same soil as the sample youdetermined the hydraulic conductivity for in problem set #5 (which had an averagevalue of 3.9x10cm/s) determine the optimal drain spacing. 2)If you were to-2grow the same crop using the K for Plano silt loam, which is 2.6x10
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