We were excited when Washington, D.C.’s Department of Public Works approached us with a stormwater challenge. Our task was to create a standardized watertight precast sand filter that would comply with regulations and would be easy to install and easy to inspect. The result became known to engineers as the Oldcastle D.C.-Style Sand Filter.
Soon after the project’s completion, orders started coming in from other cities that needed a standard, readily available system for filtering pollutants from stormwater runoff.
The success of the D.C. project didn’t stop there — it led to development of another filtration solution for capturing sheetflow runoff. We soon designed the precast Delaware-Style Sand Filter, a low-profile primary filtration system that captures nutrients and sediment from stormwater runoff, that is now used in many other parts of the country.
