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New High Level Storm Sewers

High Level Storm Sewers (HLSS) are one strategy for alleviating pressure on the combined sewer system and limiting CSO events. HLSS are designed to capture 50% of the rainfall, before it enters our pipes, and divert it directly into the waterways through permitted outlets, reducing the volume of flows that pass through the treatment plants and the combined sewer system. In addition, they alleviate street flooding in problematic areas. But we cannot simply install these separated sewers at every site. Since they require a separate pipe and outlet to a waterbody, this strategy is only cost-effective for developments near the water's edge.

High-Level Storm Sewers Planned for Construction:

  1. Southeast Queens- Springfield Blvd (Q)
  2. Southeast Queens - Laurelton Creek (Q)
  3. Gowanus Canal (K)
  4. Throggs Neck (X)
  5. Pennyfield Ave Outlet (X)
  6. Fairfax Ave/Waterbury Ave /Rawlins Ave (X)
  7. Waterbury Ave/Stadium Ave (X)

Reservoir Levels

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