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Drainage Study Sections 31 & 35/37 for Development of City Wide Stormwater Management Master Plan. Prepared for City of Palm Coast, Florida. Prepared by. August 30, 2011. Study Findings. May 2009 Storm Event Rainfall totals range = 20 – 25 inches Rainfall ~ 300 Year – 5 Day storm

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  1. Drainage Study Sections 31 & 35/37 for Development of City Wide Stormwater Management Master Plan • Prepared for • City of Palm Coast, Florida • Prepared by • August 30, 2011

  2. Study Findings May 2009 Storm Event Rainfall totals range = 20 – 25 inches Rainfall ~ 300 Year – 5 Day storm Bird of Paradise Area (Section 35) : High water reported near homes at 3 locations Measured water elevations validate model simulations (simulated elevations within 0.1 feet of measured values) Measured high water elevations equate to 25 or 50 Year - 24 Hour storm condition Rymfire Ditch Area (Section 31) : Roadway overtopping reported at approximately 5 locations Model confirms storm conditions

  3. Level of Service Evaluations System Performance Evaluation For Ditches & Canals: Service Level A: Flow is contained within the system (i.e., no flooding of major roadways, minor roadways, yards or buildings occurs) Service Level B: Flow is contained within the right of way (i.e., flooding is limited to the outer lane of major roadways and right-of-way area of yards) Service Level C: Flooding of minor streets precludes travel and flooding of yards is at the buildings but no structure flooding occurs. Service Level D: Extensive flooding of yards including buildings. Note: Level of Service Objective = “B” Level “C” is considered deficient Level “D” is considered unacceptable

  4. Level of Service Evaluations Freeboard System Performance Evaluation For Homes: Home flooding evaluated relative to base flood (i.e., 100-year storm) City code requires 1 foot of freeboard above 100-year elevation

  5. Section 31 (“R” Section) – Level of Service

  6. Modeling Results Section 31 High water levels due to: Constrictions at Royal Palms Pkwy, school & park driveways Low ground elevations in “R” Section relative to Royal Palms Pkwy and Rymfire Drive No home flooding predicted Number of homes below City standard for 100-year event = 3 % No secondary drainage deficiencies for 10 year event Nuisance flooding (2-year) at 5 road crossings

  7. Culvert replacement and ditch modifications Bypass ditch with outfall to Royal Palms Canal Section 31 (“R” Section) – Recommended Improvements

  8. Secondary drainage deficiencies Section 35 (“B” Section) – Level of Service Deficient secondary roads = 2

  9. Modeling Results Section 35 High water levels due to Constrictions at London Drive, US 1 (to Hulett Branch) I-95 (to Mulberry Creek) Home flooding predicted in < 1 % of homes (all in Bird of Paradise area) Number of homes below City standard for 100-year event = 11 % Secondary drainage deficiencies - 10 year event = 2

  10. Culvert replacement and ditch modifications Section 35 (“B” Section) – Recommended Improvements

  11. Secondary drainage deficiencies Section 37 (“L” Section) – Level of Service Deficient secondary roads = 6

  12. Modeling Results Section 37 High water levels due to Constrictions at London Drive, US 1 (to Hulett Branch) I-95 (to Mulberry Creek) No home flooding predicted Number of homes below City standard for 100-year event = 9 % Secondary drainage deficiencies - 10 year event = 6

  13. Culvert replacement and ditch modifications Section 37 (“L” Section) – Recommended Improvements

  14. Excavate existing stream Possible Detention/Reuse Storage Locations 1) ~100-acft required in total 2) Also requires construction of control structures and recovery pump system Sections 35 & 37 – Recommended Capital Improvements

  15. Recommended Improvement Plan Section 31 Improvements: Ditch and Pipe Modifications (Richardson Drive to Richmond Drive) Construct Ditch and Pipe under Royal Palms Parkway Cost $194,200 $733,800 $924,000 Level of Service Improvements: Homes below 100-year City standard reduced by 43 % Nuisance flooding eliminated Sub-total

  16. Recommended Improvement Plan Section 35 Improvements: Pipe Modifications (Bunker View Drive to Bunker Hill Drive) Cost $159,700 Level of Service Improvements: Homes below 100-year City standard reduced by 61 % Roadway deficiencies eliminated Sub-total $159,700

  17. Recommended Improvement Plan Section 37 Improvements: Pipe & Ditch Modifications Lincoln Lane to Lindsay Drive Laramie Drive to Lindsay Drive Laramie Drive to Lynbrook Drive Cost $63,200 $116,600 $184,800 Level of Service Improvements: Homes below 100-year City standard reduced by 69 % Roadway deficiencies eliminated Sub-total $364,600

  18. Recommended Improvement Plan Section 35 and 37 Improvements: Ditch Modifications (between Old Kings Road and I-95) Channel Modifications and Detention Storage Creation Cost $145,800 $3,193,400 Level of Service Improvements: Homes below 100-year City standard reduced by 63 % Homes remaining below 100-year City standard = 4 % All secondary deficiencies eliminated Sub-total $3,339,200

  19. Recommended Improvement Plan Summary of All Costs: Section 31 Improvements Section 35 Improvements Section 37 Improvements Section 35 and 37 Improvements Cost $924,000 $159,700 $364,600 $3,339,200 Grand-Total $4,787,500

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