Watersheds in Prince William Countywatershedmap.PNG

 
What is a Watershed?
 
A watershed is any area of land that water flows across or through.  Eventually, all waters flow toward a major river.  In Prince William County, we have nine watersheds with thirty-two sub sheds whose waters including streams and creeks flow to the Potomac River, then onto the Chesapeake Bay and eventually to the Atlantic Ocean.  Find out which watershed you live in by visiting our County Mapper page and selecting "Watershed" under the Environment layer. 
  
 
Click here to see a full-size image of the watershed map to the right (link will open in a new window).
 
Watershed Studies
 
Environmental Services undertakes a variety of studies to assess, monitor evaluate and seek improvements for our watersheds. These studies help determine priorities to prevent pollution, flooding, and improve water quality.  Links are provided below to complete reports from previous studies for your information.
 
  



 
WATERSHED:  BROAD RUN
 
BROAD RUN WATERSHED STUDY: Assessment of Stream Corridors and Storm Water BMPs in Five Representative Sub watersheds
 
September 2012
 
WHITMAN REQUARDT & ASSOCIATES LLP 
 
The Watershed Management Branch, Prince William County Public Works Department  Environmental Services Division, and Whitman Requardt  & Associates (WR&A) recently completed a study of the Broad Run Watershed and examined five sub watersheds in detail (Rocky Branch & Tributary, Unnamed Tributary to Broad Run, Dawkins Branch, and Kettle Run ). The purpose of the study was to determine ways to improve the County’s GIS data, assess current stream conditions, and to examine existing storm water management facilities to identify and prioritize problem areas. The results will be used to recognize opportunities for future Capital Improvement Projects. 
 
This report presents the findings of the study. It makes recommendations for: expanding GIS data coverage, improving the storm water management program, improving various programs to meet Federal and State regulatory requirements, and provides planning cost estimates totaling almost $1,140,000 for the thirteen conceptual storm water and stream projects identified as a result of the study. 
 
View the full report for the Broad Run Watershed Final Study with supporting documents:

WATERSHED:  QUANTICO CREEK
 
QUANTICO CREEK WATERSHED ASSESSMENT REPORT
 
April 2011
 
MACTEC Engineering and Consulting, Inc.
 
The Watershed Management Branch, Prince William County Public Works Department, Environmental Services Division, and MACTEC Engineering and Consulting, Inc., recently completed a study of portions of the Quantico Creek Watershed. The purpose of the study was to assess current stream conditions and to examine existing storm water management facilities to identify and prioritize problem areas. The results will be used to recognize opportunities for water quality improvement and future Capital Improvement Projects.
 
This report presents the findings of the study, makes recommendations, and provides planning cost estimates totaling more than $15,000,000 for forty five conceptual projects identified as a result of the study.
 
View the final report: 
 
Quantico Watershed Study Final Report
 
Supporting documents: 

 


WATERSHED: POWELLS CREEK

LAKE MONTCLAIR SEDIMENT FOREBAY FINAL REPORT AND RECOMENDATION
 
June  2010
 
RINKER DESIGN ASSOCIATES PC 
 
Rinker Design Associates (RDA) conducted an alternatives analysis of the conceptual design for an in-lake fore bay previously presented by Whitman Requardt & Associates.  (See “LAKE MONTCLAIR SEDIMENTATION CONTROL FEASABILITY STUDY” JULY 2008 WHITMAN REQUARDT & ASSOCIATES LLP. as described above) 
This RDA report examines numerous design and location alternatives presents findings and recommends that no fore bay construction be under taken at this time due to relative stability in the upper Powell's Creek Watershed.  RDA further recommends periodic bathymetric monitoring of the upper end of Lake Montclair to determine the actual amount of sedimentation over time. 
 
View the full report for the Lake Montclair Sediment Forebay Report along with supporting documents:

 


WATERSHED:  BULL RUN
 

BULL RUN WATERSHED STUDY

March 2010

WHITMAN REQUARDT & ASSOCIATES LLP 

The Watershed Management Branch Prince William County Public Works Department Environmental Services Division and Whitman Requardt  & Associates (WR&A) recently completed a study of portions of the Bull Run Watershed (Linden Yorkshire and Buckhall areas). The purpose of the study was to assess current stream conditions and to examine existing storm water management facilities to identify and prioritize problem areas. The results will be used to recognize opportunities for future Capital Improvement Projects. 

This report presents the findings of the study, makes recommendations and provides planning cost estimates totaling almost $1,400,000 for the nineteen conceptual projects identified as a result of the study.   

View the full report for the Bull Run Watershed Final Study with the following documents:


WATERSHED: FARM CREEK AND MARUMSCO CREEK

FARM CREEK AND MARUMSCO CREEK WATERSHED MANAGEMENT PLAN

December 2009

PARSONS BRINCKERHOFF 

The Watershed Management Branch Prince William County Public Works Department Environmental Services Division and Parsons Brinckerhoff (PB) recently completed a study of  the Farm Creek and Marumsco Creek Watersheds in eastern Prince William County. The purpose of the study was to assess current stream conditions, to examine existing storm water management facilities in order to identify and prioritize problem areas and to review historical flooding issues within the watershed(s). The results will be used to recognize opportunities for future Capital Improvement Projects. 

This report presents the findings of the study, makes general watershed recommendations and provides planning cost estimates totaling almost $6,000,000 for twenty-nine conceptual projects identified as a result of the study. 

View the full report for the Farm Creek and Marumsco Creek Watershed Study with supporting documents:


 WATERSHED: POWELLS CREEK

 

LAKE MONTCLAIR SEDIMENTATION CONTROL FEASABILITY STUDY

July 2008

WHITMAN REQUARDT & ASSOCIATES LLP 

Prince William County Watershed Management Branch engaged Whitman Requardt & Associates to evaluate erosion and sediment transport in the upper reaches of Powells Creek above Lake Montclair. The purpose of the study was to determine the feasibility of reducing the sediment load and deposition to Lake Montclair. 

The final report presents the findings of the study and provides information about the condition of the upper stream reaches sediment transport mechanisms and three (3) conceptual designs and locations for a sediment trapping forebay in the vicinity of the upper end of Lake Montclair. 

View the full report for the Lake Montclair Sedimentation Control Study.

  

 


WATERSHED: POWELLS CREEK

POWELLS CREEK WATERSHED MANAGEMENT PLAN

June 2008

MICHAEL BAKER CORPORATION 

Prince William County Watershed Management Branch tasked Michael Baker Corporation with examining the entire Powells Creek Watershed to build on previous watershed assessment studies; evaluate current conditions in the watershed; and to present the findings in a series of strategic and focused conceptual project plans to be used to budget future Capital Improvement Project (CIP) funds. Additional objectives were to provide mitigation for ongoing County projects and to measure progress toward protecting the watershed. 

This report presents general recommendations applicable to the full watershed and suggests nineteen (19) concepts for potential CIP projects at an estimated cost of approximately $7500000. The concepts presented include: stream restoration stream enhancement storm water pond retrofits culvert retrofits and Low Impact Development (LID) projects. 

View the full report on the Powells Creek Watershed Management Plan along with supporting documents: