Fort Walton Beach Council agenda — 06-17-08 special agenda — reading text

identified existing BMPs in the watershed and proposed retrofit opportunities, a summary table outlining anticipated water quality benefits and construction costs for those retrofit opportunities, PLOAD model results, and itemized cost estimate worksheets for each site. 2.0 PROJECT SUMMARY 2.1 Gap Creek Watershed —Existing Conditions Gap Creek is located in the Fort Walton Beach area of Okaloosa County and flows eastward into Cinco Bayou at Beale Parkway. Cinco Bayou is a Class H water body that is used heavily as a recreational area and outlets into western Choctawhatchee Bay. The watershed is approximately 2.9 square miles in area and is roughly bounded by Beale Parkway to the east, a runway at Hurlburt field to the west, Carmel Road to the north, Lovejoy Road and Hollywood Boulevard to the south and Mary Esther Cutoff to the southeast. The area is illustrated in the figures located in Appendix A. The creek consists of a main channel with one major tributary joining the main channel near the Overbrook subdivision. Intermittent flow through two culverts on Martin Luther King Blvd feeds the system; the north tributary flows eastward through the Emerald Village subdivision and joins the main channel near the Overbrook subdivision. The main channel Mows eastward just north of the residential side streets located on the north side of Lovejoy Road. The creek continues eastward between developed residential areas and flows into Cinco Bayou under Beale Parkway. Most of the watershed is built out; the remaining undeveloped areas are primarily wetlands, except for a few vacant parcels scattered throughout. The area located west of Martin Luther King Boulevard is partially undeveloped and consists of a mixture of Gap Creek Watershed Draft BMW Recommendations and Cost Estimates  fal privately held and government property, a. good portion of which is wetlands providing depressional storage. The area east of Martin Luther King Boulevard is almost fully built out with a mostly impervious industrial park along the south portion of the watershed and numerous residential neighborhoods with a few commercial sites throughout the remainder of the watershed. Most of the remaining vacant land is jurisdictional wetlands on the north side of the creek. The primary sources of pollutants in the watershed are expected to be from roadway and parking lot deposition and from fertilized residential lawns. Four water quality parameters of concern were identified for the Gap Creek watershed in the 2003 Okaloosa County Master Plan: total nitrogen (TN), total phosphorus ( TP), total suspended solids TSS) and biochemical oxygen demand ( BOD). These parameters of concern are consistent with the expected primary pollutant sources and are the parameters evaluated in this study. PLOAD was chosen as the water quality model for this study, based on the HDR Model Recommendation Report (December 2007). Expected pollutant loads were modeled for all identified existing BMPs, based on the area expected to be served by that BMP. The existing conditions model is illustrated in Appendix A. Twenty -two existing sites were modeled, including fifteen maintained by public entities ( Okaloosa County or the City of Fort Walton Beach) and seven maintained privately. 2.2 Gap Creek Watershed —Proposed Conditions All existing BMP sites were evaluated for potential retrofit opportunities; recommendations are presented for eight of the sites maintained by either the County or City. A complete analysis of all existing BMP sites, including a summary of why the other sites were not selected will be contained in the final report. Seven new locations for BMPs were selected and evaluated; three pond locations and four end of pipe settling chamber locations. The proposed conditions model is illustrated in Appendix A. The opportunities for retrofitting the watershed to improve water quality and address water quantity concerns were grouped into five main areas of concentration: Existing City of Fort Walton Beach wet detention pond located at the comer of Hill Avenue and Lovejoy Road Existing drainage system in the Burnette/ Bay Street area Former FDOT storage yard site/Existing Okaloosa County pond off Hickory St the existing pond outfalls into the storage yard site via a pipe network) Existing Overbrook subdivision filtration pond adjacent to Linda Cove ( Okaloosa County maintained) Gap Creek Watershed Draft BMP Recommendations and Cost Estimates 2  fal Tanglewood wet detention ponds located in Gulf Power easement ( Okaloosa County maintained) Multiple retrofit opportunities were identified and evaluated for these areas of concentration. Six other specific recommendations to improve water quality were also identified within the watershed. These opportunities are summarized in outline format in Appendix B. Fact sheets describing many of the proposals in more detail are located in Appendix C. Anticipated water quality benefits as modeled in PLOAD and cost estimates for proposed retrofit opportunities are presented in Table 1. Note that the water quality benefit is presented as a percent improvement over existing conditions — this is an overall watershed benefit. The analysis is being refined to illustrate the percent improvement for the sub -watershed that the BMP is located within (there are six sub -watersheds identified in the Gap Creek basin). More detailed results from the model are located in Appendix D; the full model results will be presented in the final report. Overall cost estimates are presented in Table 1; itemized cost estimates can be found in Appendix E. 2.3 Analysis of MLK Culverts An additional aspect in the scope of this project required the analysis of the carrying The capacity of the two culverts on Martin Luther King Drive within the watershed. HEC -HMS and HEC -RAS models developed for the 2003 Okaloosa County Master flan were updated to reflect the development that has occurred in the watershed west of the road since that time. Both analyses were conducted for the 2, 10, 25, 50 and 100 year storms ( 24 hour duration, SCS Type 3 storm). Results are summarized in Appendix F. In the 2003 analysis, no overtopping occurred at the northern culvert for this series of storms. Overtopping was shown to occur at the southern culvert for storm frequencies of ten years and greater ( County hydraulic capacity requirements are for 25 -year storm). It was recommended at that time not to upsize the culvert as there is limited available floodplain downstream of the culvert; an increase in runoff has the potential to cause increased flooding in the area, and corresponding increased risk to property. The updated analysis utilized County survey information collected in 2008 for the culvert sizes. The analysis indicates the northern culvert continues to be adequate to convey flow for the suite of storms considered; no overtopping was noted. The southern culvert remains undersized as expected; overtopping stages are 0.1' of a foot higher for the 10- year storm and remain the same for the others. The analysis demonstrates that continued development west of Martin Luther King is detrimentally impacting the system' s carrying capacity. However, due to the fact no increase in overall maximum stage is anticipated and the increased stage during the 10 -year storm is still below the stages Gap Creek Watershed Draft BMP Recommendations and Cost Estimates  fal observed during other storms, we continue to recommend maintaining the current culvert size. Continued development west of Martin Luther King Blvd will further exceed the hydraulic capacity of the system and may requiring revisiting this analysis at a later date. 3.0 CONCLUSION There are numerous retrofitting opportunities available within the Gap Creek watershed. Over twenty options are presented here. Cost estimates range from approximately $ 75 for residential rain barrels to almost $ 500,000 to develop the former FDOT site into a constructed wetland treatment system. The PLOAD analysis is currently showing the constructed wetland has less of a water quality benefit than the current swale system; this analysis will be refined, as it is contrary to the expected benefits from such a system. A number of the proposed retrofit options show a positive water quality benefit to the watershed for one or all of the constituents of concern; this benefit should be more pronounced when analyzed on a sub -watershed basis. Additionally, a number of the options presented are expected to have a flood control benefit within the watershed, based on a qualitative assessment of site conditions, the previous model for the watershed, and the theoretical benefits of the solutions presented. Draft BMIP Recommendations and Cost Estimates Gap Creek Watershed 4  CITY COUNCIL SPECIAL MEETING June 17, 2008 Public Hearing Agenda - First Reading 1- 11. 1- 1-. 1. 1 .......................... Consideration of Ordinance 1764, amending Section 12. 72 of the Land Development Code, creating Article 12. 743, entitled " Dog Friendly Dining" CDS Director) Agenda Item Number: SP - 4  CITY OF FORT WALTON BEACH, FLORIDA MEMORANDUM To: Joyce Shanahan, City Manager ) N Through: Missy McKim, CDS Director.Ji,,.V From: Samantha D. Abell, Senior Planner Date: June 3, 2008 Subject: Consideration of Ordinance 1764 - AMENDING SECTION 12. 73, ENTITLED MISCELLANEOUS PROVISIONS," OF THE CITY' S LAND DEVELOPMENT CODE, BY CREATING ARTICLE 12. 743, ENTITLED " DOG FRIENDLY DINING;" BY CREATING, PURSUANT TO SECTION 509.223, FLORIDA STATUTES, A LOCAL EXEMPTION TO CERTAIN PROVISIONS OF GENERAL LAW AND AGENCY RULES RELATING TO PUBLIC FOOD SERVICE ESTABLISHMENTS IN ORDER TO PERMIT PATRONS' DOGS AT CERTAIN DESIGNATED OUTDOOR PORTIONS OF SUCH ESTABLISHMENTS; PROVIDING FOR IMPLEMENTATION AND ENFORCEMENT PROCEDURES; PROVIDING FOR CONFLICTING PROVISIONS; PROVIDING FOR SEVERABILITY AND PROVIDING AN EFFECTIVE DATE. ( MPB Case # 08- 16 -LD) REQUEST: The CDS Department has received a request from Jenna Caldwell and Brian Burger, owners of Tijuana Flats restaurant, and Dee Poirrier, CEO of PAWS requesting that the city sponsor an amendment to the land development code ( LDC) to allow patron' s dogs within certain outdoor areas of restaurants within the city limits. BACKGROUND: On June 2, 2006, in Orlando, Florida, the Governor of the State of Florida, approved Committee Substitute for Senate Bill 1172 of the 2006 Florida Legislature), an act creating sec. 509. 233, F. S. which created a