Oftentimes, stormwater regulations require retention facilities to be fully drained within 48 hours for reasons such as vector control and managing back-to-back storms, but Lennar Homes wanted the stormwater facilities at Harvest Village to drain for a much more practical purpose…they wanted to build a park and playground. Months earlier, as the home builder was about to commence construction on the common space amenities within this new residential project, a spring storm left stormwater sitting in their retention basins for days and days. Though initial testing indicated the facilities should drain through the basin bottom within the time allowed, accumulated stormwater stood for more than 5 days, preventing construction activities from starting.
After learning of the failed design, Jurupa Valley officials suggested that Lennar Homes consider a drywell and recommended they contact Torrent Resources. Over the next few weeks, Torrent staff worked closely with the project’s civil engineer and contractor to design and install two MaxWell Plus Systems…one in each of the two basins.
Both systems were installed to a depth of 30’, which allowed them to penetrate the impermeable, confining layer that was preventing the basin from draining. Upon completion, each Plus System was flow tested and produced stabilized perc rates of 0.39 and 0.13 CFS. At this combined rate, these drywell systems can dispose of over 185,000 cubic feet in 48 hours, more than 2½ times the total volume the basins can hold.
Once the MaxWell Plus Systems were installed and tested, Lennar was able to complete the improvements in both retention basins and provide the Harvest Village residents with some beautiful amenities to enjoy.
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