#SDIP1610 Storm Drain Inlet Protection

BMP Fact Sheet (SE-10)

Storm drain inlet protection measures prevent soil and debris from entering storm drain inlets. Drain inlet protection measures temporarily pond runoff, allowing sediment to settle before entering the storm drain. These measures are temporary and should be implemented before soil is disturbed and maintained until the site is stabilized.

Storm drain inlet protection BMPs are used to detain and filter sediment laden runoff from construction sites. Examples of storm drain inlet protection devices include: silt fences, filter fabric, gravel bags, and sand bags.

Before a storm event, deploy a series of chevrons or check dams designated on your Erosion Control Plan to further protect drain inlets. Chevrons are designed to reduce the velocity of stormwater flow, allowing sediment to settle and accumulate before reaching the drain inlet. Chevrons are typically constructed with gravel bags or sand bags.

In general, storm drain inlet protection measures are practical for areas receiving relatively clean runoff that is not heavily laden with sediment. They are designed to handle drainage from areas less than 1 acre (CASQA, 2003). Protection measures should be used in conjunction with other erosion and sediment controls. To prevent clogging, BMPs must be maintained frequently and throughout the entire year. If sediment and other debris clog the inlet, drain inlet protection measures can actually cause erosion in other unprotected areas.

It is critical to conduct daily inspections of all drain inlet protection BMPs to ensure they are functioning properly. If you feel that your BMPs are inadequate, contact your QSD. Your QSD can make an amendment to your Erosion Control Plan to implement additional BMPs and ensure that all drain inlets are protected.