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A 5 inch (inside diameter) well is to be placed to a total depth of 60 m in an unconfined sand aquifer. The saturated unit weight (γsat) of the sand is 20.0 kN/m3 and the anticipated depth to water in the well during pumping is 20 m below ground surface. Would a 30 slot stainless steel screen (2.0 m long; located at the bottom of the well) have sufficient collapse strength for this application?
Notes:
a) assume that the water level inside the well will be the same as the water level immediately outside the well
b) to obtain a horizontal soil pressure, the vertical soil pressure (stress) at a given depth must be multiplied by a coefficient of earth pressure, Ko (recall basic soil mechanics ...). Assume this coefficient has a value of 0.50
c) use a factor of safety of 1.5
d) you can obtain stainless steel well screen specifications by following the link www.johnsonscreens.com/. Use the data for the Small Diameter Free-FlowTM Well Screens, W60 construction.
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