Master Plan Development - City of Boca Raton

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City of Boca Raton Stormwater Management Master PlanExisting Levels of Servicesduration (a 3-day event may have lower peak one-hour intensity than a 1-day or 1-hour event).Therefore, care should be taken when comparing the level of protection provided to one roadversus another.We recommend the additional effort be made to determine if the permitted design storm events,and resulting minimum road (or parking) elevations meet the City’s minimum level of protection.We also recommend, for consistency, that the City establish a corresponding rainfall volumeassociated with this design storm event. The City should also consider increasing the minimumlevel of protection for roadways to the 5-year/1-day event for new development; this would beconsistent with current SFWMD requirements.B. Water Quality ProvidedInformation researched in the SFWMD permit files included the level of water quality providedfor each permitted project. For areas of new development, SFWMD requires that a projectprovide either 1” times the permitted area or 2.5” times the percent impervious of the permittedarea, whichever is greater. (The percent impervious for this calculation is not straightforward;SFWMD has a specific formula for percent impervious for determining required water qualityvolume.) It can safely be stated that if a project for new development received a SFWMD permit,it provides some level of water quality. In addition to the basic water quality requirement,SFWMD requires that commercial and/or industrial landuse projects include a dry pre-treatmentretention volume equal to ½” times the project area. From the review of the SFWMD permitfiles, it appears that in the City, this requirement is frequently met with the use of exfiltrationtrench.For the City’s use, it is valuable to know what level of water quality is provided by the variouspermitted areas. Figure 13 depicts the level of water quality provided as 1” over the entirepermitted area, 2.5” times the percent impervious, or that the information was unavailable. Areasthat have no designation are not permitted through SFWMD and/or did not have designated waterquality volume specified in the permit. SFWMD permits issued for areas that were developedprior to permitting regulations are not currently subject to the water quality requirement.The actual volume of water quality provided is harder to extract from the permit files. AlthoughSFWMD Staff Reports have a location for reporting this value, it is often filled in with the samevalue as the required water quality volume; any additional water quality volume provided by theproject goes undocumented. However, additional information about water quality for permittedareas is available in the database associated with the SFWMD permit shapefile. This includesfields for the required volume and the type of water quality provided (wet detention, exfiltrationtrench, etc.).L/bocaswmp/a6016.01/InterimReport 11-27-07/r02Page 16MOCK•ROOS
City of Boca Raton Stormwater Management Master PlanInformation Maintenance Plan Recommendations6. Information Maintenance Plan RecommendationsEach database of information that has been acquired or developed under this task has value to theCity in managing their stormwater system. It is therefore recommended that the City budget forannual upkeep of this information. It will be necessary to assign responsibility for the updates tospecific staff positions. The City should document the responsibilities in the job descriptions forthose positions, so that the updates continue, regardless of the individual filling the position.SFWMD Permit InformationThe updating of the SFWMD permit information may be carried out in several ways. A periodicsearch of the SFWMD on-line permit information could generate a list of permits issued for theTownships and Ranges within Boca, for a specified range of dates. This permit informationcould then be researched to extract the database information desired. Alternatively, the Citycould require the submittal of a copy of the SFWMD permit and Staff Report for any projectrequired to obtain one.Stormwater System GISAs construction projects within the City are completed (by the City, State, County, or privateentities), the City should establish the requirement that a copy of the record information besubmitted to the City. The record information can be used to supplement and/or update theinformation that exists in the current stormwater GIS. Furthermore, the City could undertake aproject to review archived record drawing information to supplement the database information inthe existing stormwater GIS.Fields could be added to the database for scheduled and completed maintenance activities. A userinterface could be developed so that work orders could be generated from the database. Thissystem could also be used to generate a summary of the activities that have been conductedduring a specified period of time, and could be used for annual NPDES reporting.Citizen ComplaintsA user interface could be developed so that the staff position responsible for receiving the citizencomplaints could enter the information into the database associated with a shapefile representingthe area of the complaint. The fields of information could be configured so that a work orderreport could be generated for use by staff conducting the initial investigation. After the initialinvestigation, the work order could be returned and the results entered into the database. Again, areport could be generated if a subsequent work order were required to address a specificmaintenance or repair issue. With appropriate planning of the database fields, this GIS could beused to generate the citizen complaint information required by the City’s NPDES annual report.Drainage BasinsIn conjunction with the 1 st year reporting for each 5-year MS4 NPDES permit term, an update ofthe City’s major outfalls is required. In conjunction with this a review of the City’s drainageL/bocaswmp/a6016.01/InterimReport 11-27-07/r02Page 17MOCK•ROOS
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City of Boca RatonStormwater Manage
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Master Plan Development - City of Boca Raton

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