WARWICK, RI — RIDOT is replacing two 1990s era stormwater management holding basins that discharge into Buckeye Brook, north of the Knights of Columbus Hall on Sandy Lane and Warwick Ave., in a $598,500 project started last week.
According to an announcement from RIDOT, the agency will rebuild and expand the two water quality basins on the north and south sides of the brook. The basins have become overgrown with vegetation and have reduced capacity from accumulated sediment and debris from stormwater runoff. The new ponds will accept diverted stormwater and filter it through soil and plant materials to remove pollutants before it discharges into the brook.
- Expansion of northern retention basin capacity from 15,000 CF (cubic feet) to 23,185 CF
- Expansion of the southern retention basin capacity from 16,800 CF to 24,360 CF
- Conversion of the southern retention basin into a bio-retention basin with an under drain to provide higher levels of stormwater treatment which will improve the filtering out of pollutants transported in the collected stormwater, by a process where the collected stormwaters will be filtered through natural soils, natural plants and organic materials, and geo-textile materials which filter out and remove pollutants before the stormwaters flow into Buckeye Brook, thereby reaching goals to discharge cleaner stormwater into Buckeye Brook.
- Installation of two (2) pretreatment units will include hydrodynamic separators upstream of the stormwater bio-retention basin and will further increase water quality treatment by including these Best Management Practices (BMP’s) to extend the viability of the reconstructed stormwater basins (there is currently no pretreatment for the existing wet ponds).
- Removal and replacement of the existing chain link fence and guardrail next to the basins.
- Installation of new corrugated plastic pipe outfalls to Buckeye Brook with rip-rap scour and erosion control protection pads at the reinforced concrete pipe’s flared ends (RCP’s flared ends).
The existing wetlands on site will not be altered as part of the proposed project. However, there will be work that falls within the 100-foot riverbank wetland for Buckeye Brook, the 50-foot perimeter wetland for the wooded swamp and the two Areas Subject to Storm Flowage (ASSF). Sediment and erosion controls have already been put in place at the construction site.
The project will also lower the risk of flooding in the area by providing additional watershed storage volume and will reduce peak rates of flow to Buckeye Brook.
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