I have a catchbasin with an inlet and outlet storm pipe. I need to know where the elevation in measured for the inverts of these two pipes and for the bottom of the catchbasin. Please be specific where these elevations are taken at since these drain pipes have wall thicknesses and the catch basin has thickness at its bottom. Also is the inlet pipe at a higher or lower elevation than the outlet pipe? would any the these pipes be resting on the bottom of the catch basin or would there be a difference in elevation?.
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