Problem: The grading & drainage plans for a new development called out for eight (8) drywells to be installed in a retention basin. The developer was looking or any and all value engineering for cost savings. StormWater Pros was looking for opportunities to provide developer savings by not affecting the drainage design and long-term performance.
Solution: StormWater Pros installed four (4) of the eight (8) drywells called for on the plans. Once these four (4) drywells were installed then a field percolation test was performed to determine the actual field percolation rate. The field percolation rate determined was much higher than the minimum specified criteria rate used by the design engineer and thus causing more drywells to be specified than needed. StormWater Pros worked with the City personnel and design engineer to recalculate the amount of drywells needed by using an actual field percolation rate. These calculations justified the reduction of drywells needed to four (2) and led to a significant cost savings for the developer.