Pitt and Gibbon Combined Sewer Surcharging Mitigation

The Pitt and Gibbon Sewer Surcharging Mitigation aims to reduce flooding by increasing the combined sewer system capacity near the intersection of South Pitt Street and Gibbon Street.
Page updated on Oct 9, 2024 at 6:37 PM
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Project Summary

Phase: Planning

Status: Active

Location: Old Town

Managing Dept.: Project Implementation

Sponsor Dept.: Transportation & Environmental Services

Map of Alexandria with a red box indicating the project location at the intersection of S. Pitt St. and Gibbon St.
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Project Description

Google street view image of the intersection at S. Pitt St. and Gibbon St.

Residents near the intersection of Pitt and Gibbon have experienced flooding during intense rainfall events. In 2005, City of Alexandria implemented the Tanyard Ditch Storm Sewer Flood Relief Project, which involved the installation of a separate storm sewer in the project area. This project helped relieve the combined sewer system and mitigate flooding for frequent storm events. However, residents in this area still experience flooding during more intense storms. The Pitt and Gibbon Combined Sewer Surcharging Mitigation project aims to increase capacity of the existing combined sewer system to alleviate flooding for these larger (10-year design) storms.

Funding

Project Budget: $28,480,000

Learn more about the City of Alexandria's Fiscal Year Budget.

CIP Section: Sanitary Sewers

Schedule

  • Planning: January 2022 - March 2025    
  • Design: March 2025 - December 2027    
  • Construction: December 2027 - May 2030

Planning

The City of Alexandria is currently in the planning stage of a second phase of improvement for this area. This project aims to provide additional relief for larger storm events (10-year storm event). An investigation was performed in 2022, which provided modeling of the existing watershed and developed several alternatives. The City is currently exploring additional alternatives and collecting field information to develop an approved, constructible, alternative to move towards formal design.