Master Plan Development - City of Boca Raton

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City of Boca Raton Stormwater Management Master PlanOther Relevant DataB. Septic Service AreasThe City provided an AutoCAD file outlining areas of the City that are currently served by septicsystems. The information was converted into a shapefile and is presented in Figure 9. Less than1% of the City’s land area (±160 acres) is served by septic systems; however, the City is makingan effort to convert service of these areas to the public sewer collection system as otherunderground improvements are made.From a stormwater perspective, septic systems are often considered a source of pollution (fecalcoliform, nitrogen, etc.) to nearby waterways. PBC Health Department provided information forcalendar year 2006 that indicated a 0.93% incidence of septic tank failure in the County. Boca’sminimal number of septic systems, may indicate this is a minor concern for the City.C. Private Stormwater SystemsA review of the private stormwater systems within the City was done using the informationprovided in the stormwater system database, the SFWMD permits database, and the jurisdictionalroadway information. Some areas, as discussed with City, are considered semi-private whichmeans that the roadway and possibly the drainage structures are under the jurisdiction of the City,while the lake system and discharge structure are not. According to this review, approximately27% of the City is served by private stormwater systems, and approximately 4% is served bysemi-private systems.While the City has the ability to investigate, plan for, and make improvements to systems underits jurisdiction, it may have more challenges achieving improvement in private systems. The Citymay consider revising codes and ordinances to address future redevelopment of private areas as ameans to achieve higher levels of service and increased water quality. Future requirements byother government entities may impose requirements that the City develop codes that affect evenprivate systems discharging into Waters of the State.D. Light Detection and Ranging (LiDAR) InformationLiDAR is an optical remote sensing technology used to collect topographic data. Theinformation typically has a precision of approximately 6 inches. While not accurate enough fordesign purposes, it has proven very useful in drainage basin delineation, and computer modeling.In 2001, the International Hurricane Research Center at Florida International University wasawarded grant funding from the Federal Emergency Management Agency (“FEMA”) for aprogram entitled the Windstorm Simulation and Modeling project. As a component of this effort,LiDAR information was gathered for the southern portion of PBC, which included the entire City.In 2007, the SFWMD updated the data to correct some areas of error that were identified.L/bocaswmp/a6016.01/InterimReport 11-27-07/r02Page 12MOCK•ROOS
City of Boca Raton Stormwater Management Master PlanOther Relevant DataThe updated LiDAR information from SFWMD was acquired and translated into the ArcGridseen in Figure 10. The LiDAR data is available as a Digital Elevation Model (“DEM”), which isessentially a collection of points that each contains three-dimensional spatial information. Thepoint information is extremely dense making its use cumbersome and slow on the computer andillegible on any map printed at a useful scale. To facilitate using the data, the point data wasconverted into a grid. In this case, a 10-foot by 10-foot area represents one grid unit. Theelevation values for all points within each grid unit area are averaged and the average value isassigned to the grid unit. The resulting grid of average elevation values can be used to estimateelevations in a given area or to visualize elevation variations. The vertical datum of the originalpoint data is NAVD 1988. The elevation information was converted to the NGVD 1929 datum(by adding the approximate difference of 1.5’) in order to correspond more readily to otheravailable elevation information.L/bocaswmp/a6016.01/InterimReport 11-27-07/r02Page 13MOCK•ROOS
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Table 4Potential High Risk Facility
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City of Boca Raton Regulatory Infor
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Master Plan Development - City of Boca Raton

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