In continuation of my previous blog, there are many structural BMPs available for stormwater control but choosing appropriate site-specific BMP is the key aspect in achieving the right results. There are several factors affecting the BMP selection:

Process involved and the chemicals present at the site;

Proximity to waterbodies and population;

Age of the facility or equipment on site;

Management of BMPs; and

Cost involved.

To help in selecting the right BMPs, first review the site profile and determine the processes that could affect the stormwater and evaluate the effectiveness of the BMPs based on the processes. Also, it is important to select the right location to meet the suitability criteria such as drainage area, slope, soil group etc.

BMPs are classified into scale-based according to the size of the application area and type-based according to geometric properties. Type-based BMPs are further classified into Point BMPs capturing discharge at a specific location like bioretention ponds, Linear BMPs which provide filtration of runoff like bio swales and Area BMPs which are land-based management practices like impervious areas.

It is always more cost effective to prevent runoff than to treat runoff. Practices such as good housekeeping, public education, employee training, material management, soil stabilization and seeding, illicit discharge elimination, stormwater reuse will help in the source reduction.

Shri Vani Sripada is a Project Engineer at Smith Management Group. Shri Vani can be reached at Please feel free to contact Shri Vani if you have any questions or need any assistance regarding the Stormwater Program.