During development of enclosures which have a structural role (Pump Chambers, Manholes, Water Storage, Septic Tanks, Bio-Reactor) the design engineer has to evaluate all the forces acting, i.e. their direction and magnitude.
The walls are subject to compression forces from the earth surrounding the chamber which increases with depth. Groundwater conditions impose a potential for crushing the chamber and may add buoyancy. The deadload of the overfill and any vehicular / pedestrian load or other imposed stresses act upon the chamber. Then we have to consider where in the World it is to be installed and if the effects of temperature upon the polymer are a critical consideration e.g. permafrost.
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