Municipal Green Stormwater Infrastructure (GSI) Feasibility Analysis for Nine Mile Run, Girty's Run and McNeilly Run Sewersheds
Green Stormwater Infrastructure

BMP Features

Client: 3 Rivers Wet Weather
Location: Allegheny County, PA

As a key member of the 3 Rivers Wet Weather (3RWW) Program Management Team, LSSE developed an engineering assessment and planning-level technical / cost-effectiveness-based methodology used to identify GSI opportunities within Combined Sewer Long Term Control Plans (LTCP) and Wet Weather Planning (WWP). Lacking any pertinent publishing guidance, the goal was to develop and implement an evaluation protocol for comparison of GSI vs. conventional grey alternatives cost effectiveness and to assess source flow reduction alternatives. The evaluation report involved several pilot sewersheds and included:

  • mapping GIS features;
  • identifying project areas;
  • analyzing data;
  • evaluating the effectiveness in reducing runoff;
  • developing capital and operating cost estimates; and
  • providing a summary of the findings and project deliverables.

Methodology was based on the state-of-the-art scientific, technical and GIS protocols, U.S. Environmental Protection's Agency (EPA) system for Urban Stormwater Treatment and Analysis Integration (SUSTAIN), best management practices (BMP) siting tool and 3RWW RainWays Tool.

The results of the study were reviewed by municipal representatives and engineers from each of the pilot sewersheds who expressed satisfaction with the process and indicated they intend to use the results.