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WATER RESOURCES / STORMWATER MANAGEMENT

 

West Melbourne Stormwater Needs Analysis Phase II
Brevard County

DRMP provided water resources engineering for this 37-square mile project to provide updates to stormwater infrastructure inventory, develop a watershed surface water model using a GIS platform and ICPR, and develop a 100-year floodplains and master stormwater plan.  Updates to GIS stormwater infrastructure inventory were conducted by review of ERP files, Water Control District databases, County and City project files.  Sub-basin development occurred using ArcHydro.  A surface water model was developed in ICRP vs. 3.10 for entire canal and creek network throughout City limits and parts of County.  Verification of model was performed with biggest recent flood from Tropical Storm Fay.  Floodplain delineation was conducted for 100-year storm event.  Flooding problem areas were analyzed and flood protection projects with water quality improvements were recommended.  Methodology and findings were presented to the City Council and documented in a GIS database and technical memorandum.

 

Project Photos (click for larger view)
 
Florida Hospital Rollins Campus   Florida Hospital Rollins Campus          

 

 

Dunedin Isles Roadway and Drainage Improvements
City of Dunedin

DRMP provided drainage and roadway design to provide stormwater retrofit to the Dunedin Isles subdivision (approximately 80 acres) that was experiencing chronic flooding due to a lack of storm sewer and flat longitudinal grade.  The project required the reconstruction of 11 residential streets with numerous sidewalk replacements and ADA upgrades and also improved the water quality discharge to the Hammock Park wetland system; and ultimately to Cedar Creek. To help facilitate positive drainage, the roads were reconstructed with a 2-foot drop curb/valley gutter and increased slopes.  Some of the street pavement designs utilized geogrid to provide additional structural support to help protect existing utilities.  Numerous undersized outfall pipes were replaced with larger pipes.  This project also included the design of two stormwater ponds that function together in a cascade approach which effectively removes a greater amount of pollutants. In the upstream portion of the basin, one dry pond was proposed on the historic Dunedin Golf Course to attenuate and treat large volumes of golf course runoff that was previously sheet flowing across residential roads and into residential homes. Downstream, an existing wet pond was expanded to provide additional flood volume and treatment.  In addition, a CDS unit was proposed to treat two residential streets which could not be piped to the pond system due to hydraulic grade issues. 

 

Project Photos (click for larger view)
 
Florida Hospital Rollins Campus   Florida Hospital Rollins Campus          

 

 

Districtwide NPDES
FDOT District Three

DRMP drainage engineers are providing NPDES permit implementation and compliance services districtwide for FDOT District Three. Tasks are comprised of Phase I and Phase II annual report updates, mapping, inspections, monitoring, pollutant loading updates, stormwater retrofit design, development of standard operating procedures, coordination with local partners and public involvement. Under this contract, our drainage staff has updated outfall mapping for the entire District Three system (798 outfalls).

 

Project Photo (click for larger view)
 
Florida Hospital Rollins Campus              

 

 

Center Ridge Watershed Management Plan
Southwest Florida Water Management District

DRMP developed a comprehensive watershed management plan (WMP) for the Center Ridge watershed which is approximately 55 square miles located in central Citrus County, Fla.  The project centered upon developing a surface water model (ICPR version 3.1) based on an accurate digital terrain and structural inventory, providing accurate floodplain information to FEMA standards for DFIRM generation by others, evaluating water quality aspects of watershed and developing alternatives for improvements to flood protection and water quality using Best Management Practices (BMPs).  In addition, detailed data collection, including review of 80 geotechnical/drainage reports and over 340 project files, was utilized in developing the surface water model with special detail added for the groundwater components. All study input and results are meticulously organized in a GIS geodatabase using the most current version of the District-supported GWIS (version 1.6).

 

Project Photos (click for larger view)
 
Florida Hospital Rollins Campus   Florida Hospital Rollins Campus          

 

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