Type of Document Master's Thesis Author Hodges, Kimberly Jean Author's Email Address hodgesk@andassoc.com URN etd-294420559741551 Title Assessing Urban Non-Point Source pollutants at the Virginia Tech Extended Dry Detention Pond Degree Master of Science Department Civil Engineering Advisory Committee
Advisor Name Title Loganathan, G. V. Mostaghimi, Saied Kibler, David F. Committee Chair Keywords
- non-point
- pollution
- stormwater
- detention
- quality
Date of Defense 1997-05-23 Availability unrestricted Abstract
With a growing concern for the
environment and increasing
urbanization of rural areas,
understanding the characteristics of
urban non-point source pollution has
become a focus for water quality
investigators. Once thought to be a
small contributor to the pollution
problem, urban non-point sources
are now responsible for transporting
over 50% of all pollutants into
natural waterways. Assessing
non-point source pollution is the key
to future water quality improvements
in natural receiving waters. The
purpose of this research was to
investigate the water quality of an
urbanized watershed, analyze
current prediction methods and to
investigate the effectiveness of an
extended dry detention basin as a
pollutant removal management
practice on a 21.68-acre urban
watershed on the Virginia Tech
Campus. This research included
extensive stormwater monitoring and
sampling to characterize the runoff
and water quality from an urban
watershed. The resulting analysis
included comparing well-known
desktop prediction methods with
pollutant removal rates using an
extended dry detention basin and
comparison with different literature
values. Finally, the study team
calibrated the PSRM-QUAL model
for watershed prediction of
non-point source runoff and
pollution. The results of the
stormwater monitoring process
show that water quality prediction
methods are not very successful on
a storm by storm basis, but can be
fairly accurate over longer periods
of time with little or no storm water
quality sampling. The extended dry
detention basin is a simple yet
effective management practice for
the removal of sediments and
sediment bound pollutants.
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