Penn State Runoff Model
F. X. Browne, Inc. personnel have used
stormwater modeling to examine the hydrology and pollutant discharges of a small
urban watershed in southeastern Pennsylvania. The model was prepared using the 1995 Penn State Runoff Model for
Water Quality. The 88 acre watershed was largely residential with significant
areas of commercial land use, two major state highways, and a local commuter
rail line. The model was designed to evaluate the water quality improvement of
implementing various upstream BMPs.
In order to expand their treatment plant, Wrightstown was required to conduct water quality modeling to show that the effluent from their expanded plant would not violate existing water quality standards. F. X. Browne, Inc. conducted intensive physical, chemical, and biological monitoring of North Run Crosswicks Creek to develop and run the QUAL2E water quality model. F. X. Browne, Inc. evaluated various flow and water quality scenarios with respect to stream water quality. F. X Browne, Inc.ís modeling results allowed the Wrightstown treatment plant to be expanded in a cost-effective manner.
Spring Creek Water Quality Modeling
F. X. Browne, Inc. personnel evaluated phosphorus standards for wastewater treatment plants in the Spring Creek and Bald Eagle Creek watershed using the dissolved oxygen balance model DOBAL. The model was used to estimate diurnal fluctuations in dissolved oxygen concentrations due to photosynthetic activities of rooted aquatic macrophytes in the stream. This information was used, along with in-stream phosphorus concentrations and solar radiation, to develop an empirical relationship between in-stream primary productivity, in-stream total phosphorus concentrations, and solar radiation for the Spring Creek Watershed.
Wasteload Allocation Evaluations
F. X. Browne, Inc. has conducted wasteload allocation studies using sophisticated water quality models for the Sambo Creek (Smithfield Township, Monroe County, PA), Concord Creek (Concord, PA), and Little Walker Creek (Shohola Township, Pike County, PA) to determine effluent limits for wastewater treatment facilities.
F. X. Browne, Inc. developed a White Paper on stormwater modeling for a county in Maryland. The paper evaluated numerous models including the EPA Stormwater Management Model (SWMM), Non-point Source Model, STORM, HSPF Model, DR3M-QUAL, P4 Urban Catchment Model, AGNPS, ANSWERS, CREAMS, HEC-1, and the EPA Screening Procedures. The paper provided several matrices that illustrated the applicability and desirability of each model. A priority ranking system was developed to assist in the selection of the proper model.
New York DEP Croton Reservoir Study
F. X. Browne, Inc. was hired by the New York City DEP to evaluate water quality modeling of the Croton Reservoir and to evaluate the proposed watershed management plan and BMPs recommended for the Croton Reservoir watershed. F. X. Browne, Inc. worked with a blue-ribbon Citizens Advisory Committee to develop a regional plan for avoiding filtration of the Croton Reservoir water supply.
Moores Creek, Charlottesville, Virginia
F. X. Browne, Inc. developed an in-stream water quality model of Moores Creek in Charlottesville, Virginia. The model used the sophisticated Monte Carlo water quality simulation. Field activities included diurnal water quality monitoring, time-of-travel studies, and dye studies.
City of Independence, Missouri
F. X. Browne, Inc. used the Penn State Runoff Model (PSRM) to model a subwatershed in the City of Independence. Various development and stormwater control scenarios were used to model stormwater flow, pollutant loadings, and resultant water quality. F. X. Browne, Inc. developed a users' manual and presented the manual at a modeling seminar.
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