Town Stormwater Master Plan Public Educational Meeting

Town of Redington Shores SWMP Public Education Workshop Presented by: Cardno now Stantec Date: August 15, 2022 Agenda – Introductions & Project Background – Project Schedule – Scope of Work – Public Workshops & Comment Cards – Q&A Cardno now Stantec History – Engineer of Record since early 90’s – Founded 1945 – Full Service Civil and Environmental Engineering Firm – International Firm with Local Community Focus – Over 80% of Work is Public Sector – Joined Stantec in December 2021 – Over 200 Staff Locally Project Team Rick Bowers, PE | Senior Drainage Engineer / GIS / Quality Assurance/Quality Control – 30+ years of experience – Drainage Design / Stormwater Management / Watershed Management/ Asset Management / GIS Representative Project Experience Jumper Creek Watershed, SWFWMD Town of Redington Shores – Watershed Master Plan – Stormwater Needs Analysis Bushnell Watershed, SWFWMD Town of North Redington Beach – Watershed Master Plan – Stormwater Needs Analysis Blue Sink Watershed, SWFWMD University of Florida – Watershed Master Plan – Stormwater Master Plan Basin C-51, SFWMD – Watershed Master Plan Project Team Tanya Camacho, GISP | GIS – 15 years of experience – Water Resources / NPDES / Asset Management / GIS / Utilities Representative Project Experience Jumper Creek Watershed Blue Sink Watershed, SWFWMD – Watershed Master Plan – Watershed Master Plan Bushnell Watershed Wiscon Watershed, SWFWMD – Watershed Master Plan – Watershed Master Plan Hernando County Map Modernization Project, SWFWMD Roosevelt Creek Watershed Management Plan Update, Pinellas County Project Team Chris Knox, PE | Project Manager, Senior Drainage Engineer – 20+ years of experience – Drainage Design / Stormwater Management / Watershed Management Representative Project Experience Jumper Creek Watershed South Wabash Avenue Extention form – Watershed Master Plan Harden Blvd. (SR 563) to Ariana Street, Lakeland, FL Bushnell Watershed Edgewood Drive from South Florida Watershed Master Plan Avenue to Harden Blvd, Florida Bee Branch Creek Channel Restoration Town of Redington Shores Analysis – Stormwater Needs Analysis 62nd Avenue North Sidewalk Improvements – Pinellas County, FL Town of North Redington Beach Starkey Road Sidewalks, Pinellas County, FL – Stormwater Needs Analysis District-wide Stormwater Program Management – FDOT District 7 Florida Project Background and Schedule Project Location – 220 ac. with 1.19 mi of shoreline and a total of 6.22 miles of road – Situated on Sand Key in West- Central Pinellas County – Bound by the Gulf of Mexico to the west and by Boca Ciega Bay, a protected aquatic preserve, to the east Scope of Work > Development of a project management plan (PMP) that includes a list of deliverables, schedules, communication protocols, and a quality assurance/quality control (QA/QC) plan. > An existing conditions watershed evaluation, which will include field evaluations of the stormwater management system asset inventory. > Inundation analyses. > Level of Service (LOS) Analysis. > Develop responses to Town’s Review of the stormwater model and deliverables. > Best Management Practices (BMPs) alternatives to minimize flooding and address sea level rise (SLR). Model Development > Drainage Data Collection – SWFWMD Permit Reviews – LiDAR (Light Detection and Ranging) – Aerial Photographs – Landuse / Land Cover – Groundwater, Soils, Pervious & Impervious land features – Current / Future Tailwater Elevations Citation: Streamline Technologies 20140611_Migrating_from_ICPR3_to_ICPR4_Streamline_Technologies.pptx LiDAR > 2017 Pinellas County LiDAR Landuse > 2020 Landuse – Residential High Density – Recreational – Commercial and Services Model Development > Existing Drainage Structure Inventory – Catch Basins – Outfalls – Pipes > Closed-circuit TV (CCTV) – Review Video – Inspection Reports  Model Development > Existing Drainage Structure Inventory – Staff will verify locations of existing stormwater inventory and add missing structure locations if needed. – Visual condition observations captured – Survey if needed Source: Google Maps, 2022 > Design / Update the GIS Storm Pipe Systems > 284 Pipes in Database > 8 inch and larger pipes to be modeled > Upstream and Downstream Inverts provided. Missing data to be estimated from Digital Elevation Model (DEM, from LiDAR) or Upstream / Downstream Culverts Upstream Upstream Initial Initial Stage Stage at at Pipe Invert Pipe Invert Downstream Downstream at at Low Low Point Point of of Basin Basin Source: Google Maps, 2022 Structures  51 Outfalls  236 Catch Basins  Weirs  Water Control Structures  Overland Discharge from Source: Google Maps, 2022 Closed Catchments  Hydrologic and Hydraulic Model Development / Analysis > Develop an ICPR4 model of the existing drainage conditions of the Town > Town Review > BMPs Alternatives Analysis and Recommendations – 8 conceptual BMPs to alleviate inundation Citation: Streamline Technologies 20140611_Migrating_from_ICPR3_to_ICPR4_Streamline_Technologies.pptx  Hydrologic and Hydraulic Model Development / Analysis > Development of an ICPR4 model Storm Duration of the existing drainage 2.33 mean-annual 24hr conditions for the Town of 10yr 24hr Redington Shores 25yr 24hr > Town Review 50yr 24hr 100yr 24hr > BMP Alternatives Analysis and Recommendations – 8 conceptual BMPs to alleviate flooding Citation: Google Maps  Inundation Analysis / Mapping (Existing Condition & SLR Assessment) > Evaluate overall performance and capacity of the stormwater system > Identify potential flooding problems and create town- wide flood inundation maps (current and future) Citation: Pinellas County SLR Map Application Sea Level Rise (arcgis.com)  Level of Service > Roadway Level of Service to determine roads affected by flooding > BMP Analysis to provide solutions for affected areas identified by FPLOS determination Citation: Hernando County LOS SWRA BMP Approach 20131017.pdf  Level of Service > Roadway Level of Service to determine roads affected by flooding > BMP Analysis to provide solutions for affected areas identified by FPLOS determination Public Outreach Meetings > Public Outreach Meetings – Educational Workshop and gather historical flood data – Stormwater Master Plan Results Workshop Citation: SWFWMD Public Review & Comment Cards Jumper Creek Watershed  Public Comment Cards > Public Comment Cards – submit by Oct 17th to Town Hall or helpdesk@redshoresfl.com > Leave comment cards with Town Hall receptionist > Provide as much information as possible, specifically dates, event names, and photographs, if available. Questions  Seawall Ordinance > Sec. 63-15.4. - Seawalls: construction specifications. C.Cap. The seawall cap shall be poured in place and shall have a minimum width of 22 inches and a minimum depth of 16 inches. Embedment of sheet pilings into the cap shall be six-eighths inches. Finished seawall cap elevations shall be between seven and one-half feet and eight and one-half feet N.G.V.D. Expansion joints between one-half inch and three-fourths inch shall be provided at spacings not to exceed 40 feet. Expansion joints shall be located no less than one foot from slab joints, and expansion joints shall be filled with proper expansion material. Seawall caps shall contain four longitudinal reinforcing bars not less than No. 6 size and No. 5 stirrups not more than nine inches on center within a quarter span of anchor rods and 18 inches on center for the remaining span. Benefit to Cost Analysis Each proposed BMP requires a planning level cost estimate and an analysis of the benefit to cost ratio. Costs associated with implementing a BMP may include: • Construction cost based on quantities • Mobilization • Maintenance of traffic • Contingency • Surveying and testing • Design • Permitting • Construction administration and observation • Anticipated maintenance costs Benefit to Cost Analysis For flood protection BMPs, the benefit to cost ratio measures how well the proposed improvements will reduce flood damage over a predetermined time period (usually the project life). A value above 1 indicates the cost can be well justified by the benefit through BMP implementation. A value of 1 is the “breakeven” point while a value below 1 indicates the implementation is likely more costly than the expected benefit (e.g., reduced flood damage). 𝑹𝑹𝑹𝑹𝑹𝑹𝑹𝑹𝑹𝑹𝑹𝑹𝑹𝑹𝑹𝑹𝑹𝑹 𝒊𝒊𝒊𝒊 𝒕𝒕𝒕𝒕𝒕𝒕𝒕𝒕𝒕𝒕 𝒅𝒅𝒅𝒅𝒅𝒅𝒅𝒅𝒅𝒅𝒅𝒅 𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄 𝒐𝒐𝒐𝒐𝒐𝒐𝒐𝒐 𝒆𝒆𝒆𝒆𝒆𝒆𝒆𝒆𝒆𝒆𝒆𝒆𝒆𝒆𝒆𝒆𝒆𝒆𝒆𝒆 𝒑𝒑𝒑𝒑𝒑𝒑𝒑𝒑𝒑𝒑𝒑𝒑 𝑩𝑩𝑩𝑩𝑩𝑩𝑩𝑩𝑩𝑩𝑩𝑩𝑩𝑩 𝒕𝒕𝒕𝒕 𝑪𝑪𝑪𝑪𝑪𝑪𝑪𝑪 𝑹𝑹𝑹𝑹𝑹𝑹𝑹𝑹𝑹𝑹 = 𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻 𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄 𝒊𝒊𝒊𝒊𝒊𝒊𝒊𝒊𝒊𝒊𝒊𝒊𝒊𝒊𝒊𝒊 (𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄 𝒂𝒂𝒂𝒂𝒂𝒂 𝒎𝒎𝒎𝒎𝒎𝒎𝒎𝒎𝒎𝒎𝒎𝒎𝒎𝒎𝒎𝒎𝒎𝒎𝒎𝒎𝒎𝒎) 𝒐𝒐𝒐𝒐𝒐𝒐𝒐𝒐 𝒆𝒆𝒆𝒆𝒆𝒆𝒆𝒆𝒆𝒆𝒆𝒆𝒆𝒆𝒆𝒆𝒆𝒆𝒆𝒆 𝒑𝒑𝒑𝒑𝒑𝒑𝒑𝒑𝒑𝒑𝒑𝒑 BMPs are ranked and evaluated by staff.  Inundation Analysis / Mapping (Existing Condition & SLR Assessment) > Evaluate overall performance and capacity of the stormwater system > Identify potential flooding problems and create town- wide flood inundation maps (current and future) Citation: Pinellas County SLR Map Application Sea Level Rise (arcgis.com) Surface Water and Groundwater Precipitation Sea Level Land Groundwater Lens Gulf of Intercoastal Mexico Soil Saturated with Sea Water