Public Works and Environmental Services

CONTACT INFORMATION: Our administrative offices are open 8 a.m. – 4:30 p.m., Mon - Fri
703-324-5500 TTY 711
12000 Government Center Parkway
Suite 449, Fairfax, Va 22035
Joni Calmbacher
Director, Stormwater Planning

Potomac Hills Neighborhood Stormwater Improvements

Project Number: SD-000032-085

Project Update: October 12, 2023

Flodding - Potomac Hills


Project Background

As a result of several recent storm events, including the July 2019 event, the Potomac Hills neighborhood experienced significant flooding. This stormwater improvement project will evaluate existing drainage and stormwater infrastructure that leads to the local stream, Pimmit Run, and recommend a solution to mitigate the flooding.

Project Description

This neighborhood stormwater improvement project will evaluate existing drainage and stormwater infrastructure throughout the Potomac Hills neighborhood and within a 90-acre drainage area that leads to Pimmit Run. The project's primary goals are to mitigate structural flooding and improve the resiliency of the drainage system.

Project Location

This project is in the Potomac Hills neighborhood and includes the drainage system from Mori Street, Nelway Drive, Kellogg Drive and Cola Drive to Pimmit Run.

map - Potomac Hills


Project Phase

County staff are evaluating the concept design and alternatives to minimize large scale disruption throughout the neighborhood. Staff will be working with individual property owners over the coming months to determine solutions to reduce structural flooding.

Project Benefits

  • Reduce localized flooding
  • Address structural flooding and public safety concerns
  • Improve stormwater drainage conditions and infrastructure


The draft concept design has been received and is under review by County staff. County staff are in the process of evaluating next steps.

What to Expect

Throughout the design process Fairfax County staff will work closely with the design engineer and Potomac Hills community to determine the best possible solution to reduce flooding hazards within the project area.

Project Cost and Funding Source

The design and construction of the Potomac Hills stormwater improvement project are estimated to cost $3-5 million. Stormwater projects are funded through the county Stormwater Service District. Construction is based on approval of future funding.


For more information, please email the Project Manager, Heather Ambrose at within the Stormwater Planning Division, Department of Public Works and Environmental Services, or call 703-324-5500, TTY 711.

Fairfax Virtual Assistant