ERD Clients and Projects
 
 

 

Performance Evaluation of Detention with Filtration Systems


CLIENT INFORMATION
CLIENT: St. Johns River Water Management District
CONTACT: David Miracle, P.E. (904-448-7917)
PROJECT DATES: 1990-1993
PROJECT DIRECTOR: Dr. Harvey H. Harper, P.E.
LABORATORY DIRECTOR: Vanessa Permaul


PROJECT BUDGET AND SCHEDULE
PROJECT BUDGET: $134,000
FINAL COST: $134,000
PROPOSED SCHEDULE: 24 months
ACTUAL COMPLETION TIME: 27 months*
*Due to change in study site


PROJECT INFORMATION
Construction of Experimental Side Drain FilterAn 18-month study was conducted by ERD to evaluate the performance, refine the design practices and support rule revisions for the use of detention with filtration as a stormwater management technique in the lower St. Johns River basin. A wet-bottom detention with filtration system in DeBary, Florida was selected as the study site.

ERD performed a delineation of contributing watershed areas and defined physical characteristics of the pond such as bathymetric and stage-storage relationships. Instrumentation was installed to provide a complete hydrologic budget for the pond including a recording rain gauge, recording evaporimeter, recording water level indicator, and a staff gauge.

Completed Side Drain FilterIn addition, multi-port groundwater monitoring wells were installed by ERD personnel to collect groundwater samples at four discrete locations within the water table. A total of 16 piezometers were installed to provide piezometric contours surrounding the pond.

Constructed Flow Monitoring WeirInstrumentation for automatic collection of stormwater samples was also installed at the pond site. Stormwater samples were collected during storm events over a six-month period, to represent a wide range of rainfall intensities and antecedent dry period. Continuous monitoring of water quality characteristics of the underdrain discharges was also conducted to determine removal efficiencies for typical stormwater pollutants within the detention with filtration system.

Sediment core samples were collected in the pond to investigate the horizontal and vertical migration of heavy metals and nutrients within the pond sediments.


RELEVANT WORK EFFORTS/PRODUCTS

  • Delineation and field verification of contributing watershed boundaries
  • Use of field surveys to develop bathymetric and stage-storage relationships for the stormwater pond
  • Installation of monitoring equipment to conduct a complete hydrologic balance for the pond
  • Installation and sampling of three multi-port groundwater monitoring wells
  • Installation and maintenance of automatic stormwater collection and flow monitoring equipment to characterize inputs and outputs from the pond
  • Evaluation and modeling of horizontal and vertical migration of heavy metals and nutrients in the stormwater system
  • Evaluation of the removal efficiency and important attenuation mechanisms for typical stormwater pollutants within the pond water column and filter system
  • Development of recommendations to improve performance of detention with filtration systems

 

 

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