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Cary NC Environmental Engineering Firm Involved with Stormwater Drainoff
Stormwater runoff from the site’s impervious surfaces (building roofs, parking lots, vehicle and pedestrian travel areas) and a portion of off-site drainage areas (existing roadways) was designed to be routed through surface and subsurface conveyance measures and finished surface grade into two subsurface infiltration trench systems installed on the northern and southern corners of the property. Each infiltration trench system was designed to capture and treat the first 1.5 inches of stormwater runoff from its respective drainage area, in accordance with North Carolina’s Coastal Stormwater Management Requirements. Runoff in excess of the first 1.5 inches was designed to be routed via surface flow into vegetated swales constructed along the right-of-way along the southern property line.
Each infiltration trench consists of 30-inch diameter ADS perforated piping. The piping was installed in a row-like fashion and manifolded into a header at the inlet end of each trench. The piping was installed within a bed of 10 inches of washed stone with a stone cover 2 inches thick. A 12-inch stone border was placed along the outer perimeter of the chamber matrix, and the chambers and stone were installed within a filter fabric liner and covered with a 2-inch layer of compacted fill and 2 inches of asphalt pavement. The infiltration trenches were installed at a final depth of 2 feet above the seasonal high water table in accordance with state stormwater requirements. The piping was designed with a traffic loading rating of AASHTO H-20 due to the thin layer of cover required to maintain final site grade and depth restrictions.
VisionQuest Wealth Management