So we now know what the minimum volume of the wet well should be to handle all inflow rates. We now need to select our wet well shape and size. This is an iterative process. A good place to start is by sizing the minimum hatch dimensions as this sets the minimum well diameter.
First determine the horizontal dimensions of the pumps by referring to the technical information sheets for your selected pump. Some important dimensions are shown in the following example:
The minimum length of the hatch is the distance between where the guide rail bracket mounts onto the hatch edge and the front of the pump. This is typically shown on the pump technical sheet.
To determine the minimum width of the hatch, use the following equation:
Hatch Width = (Number Of Pumps * Pump Width) + [(Number Of Pumps – 1) * Minimum Pump Spacing]