Calculating Drainage: Sizing Catch Basins
Catch basins are an effective way to collect surface water that is draining to one specific area, like a low spot in the yard or below a rain gutter downspout. Surface water flows through the grate on the catch basin then exits through a drain pipe connected to the basin. There are several sizes of catch basins. To determine which catch basin is needed, you need to check the flow capacity of both the grate and the outlet where the drain pipe connects to the basin.
Flow capacity tables have been created for each catch basin. These tables show the grates that fit each basin and their corresponding flow capacities. The outlet flow capacities are also shown for each basin.
To determine if a particular catch basin will work for your situation, follow the following steps:
3.Compare the runoff calculated in step 1 to the Flow Rate for both the grate and the outlet. These Flow Rates must be larger than the calculated runoff. If these rates are greater than the calculated runoff, then this basin will work for your project. If either of these values is less than the calculated runoff, then you must use a larger basin.
See this and the full "How to Calculate Drainage" video series here. Visit the NDS contractor website to receive a starter package that includes training and marketing materials or visit the NDS YouTube channel for extensive installation videos and helpful product overviews.
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