What is the maximum height allowed for check dams in dry swales?

The maximum height allowed for check dams in dry swales is 12 inches. This height is prescribed to ensure proper function and effectiveness in managing stormwater. Check dams, which are typically constructed from materials such as rock, gravel, or vegetation, serve to slow down the flow of water, promote infiltration, and assist in sediment capture.

Having a maximum height of 12 inches allows for sufficient water retention without causing excessive backwater that could lead to erosion or damage to the swale itself. It also ensures that the structures can effectively maintain their integrity and function over time. The limitations on the height of check dams are based on hydrological studies and engineering principles that aim to balance water management needs with soil and vegetation stability within the dry swale system.

Higher check dams could pose risks of overtopping or failing under significant rainfall, which could lead to increased erosion or sediment discharge, negating their intended purpose. Hence, restricting the height to 12 inches is critical for the performance of dry swales in a stormwater management context.