Title page for ETD etd-05152007-173722

Type of Document Master's Thesis
Author Gorrie, Jason Robert
URN etd-05152007-173722
Title An Examination Of Water Quality Impacts On Lake Manassas
Degree Master of Science
Department Environmental Engineering
Advisory Committee
Advisor Name Title
Godrej, Adil N. Committee Chair
Grizzard, Thomas J. Committee Member
Post, Harold E. II Committee Member
  • Nutrient Loading
  • Eutrophication Models
  • Reservoirs
  • Lakes
  • Eutrophication
Date of Defense 2007-04-26
Availability unrestricted
Lake Manassas is a man-made impoundment in the Northern Virginia suburbs of Washington, D.C. The lake currently supplies drinking water at an average rate of 10.5 million gallons per day to the City of Manassas, Virginia. The lake discharges, via the Broad Run, a tributary of the Occoquan Reservoir. The Occoquan Reservoir supplies potable water to over 750,000 people in the Northern Virginia area.

This thesis presents the results of a limnological analysis of Lake Manassas. The techniques used are established limnological techniques to arrive at a profile which can be compared to accepted scales of ranking.

One conclusion from the analysis is that Lake Manassas is eutrophic, which means that the production of biomass in the lake is at a higher than desired rate. The result of this eutrophic condition is that the water quality of the lake will decline rather rapidly. Another conclusion is that Broad Run is the major supplier of nutrients into Lake Manassas, but that conditions are also affected by a point source discharge from a sewage treatment plant. These conclusions are consistent with previous studies done on Lake Manassas.

In summary, Lake Manassas is an important water resource in the Northern Virginia area, and it is important to continue to closely monitor and manage runoff practices in the watershed to ensure the lake does not degrade to unacceptable conditions.

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