1.  Prepared by  Prepared for  City of Palm Coast, Florida  January 27, 2015  Drainage Study Sections 30 & 34 for Development of City Wide Stormwater Management Master Plan

2. Singhofen & Associates, Inc.January 27, 2015  Comprehensive Approach for Priority Criteria  Visual Inspections of Aging Infrastructure  Pipe Ratings  Historical Records from Rainfall Events  Visual Inspections of Stormwater System  Public Works High Water Signage Areas  Complaints (Service Orders) from Citizens  Customer Service Calls Combined With Follow Up Inspections  Other Special Situations  High Groundwater Areas City of Palm Coast Modeling Priority

3. Singhofen & Associates, Inc.January 27, 2015  Section Numbers  Sections Already Modeled  Next Sections To Be Modeled City of Palm Coast Modeling Status 1234567891011 1213141516171819202122 2324252627282930313233 3435373957585960636465 81

4. Singhofen & Associates, Inc.January 27, 2015 City of Palm Coast Modeling Status

5. Singhofen & Associates, Inc.January 27, 2015  Historic storms  May 2009 Storm Event  Rainfall totals range = 20 – 25 inches  Rainfall ~ 300 Year – 5 Day storm  September 2014  Rainfall total 17-19 inches  Rainfall >200 Year – 2 Day storm  May 2009 Storm Event  “R” Section (Section 30) :  High water reported at or near homes at 3 locations  Roadway overtopping reported at approximately 5 locations  Model confirms storm conditions  “E” Section (Section 34) :  High water reported at or near homes at 4 locations  Roadway overtopping reported at approximately 10 locations  Model confirms storm conditions Current Study Findings

6. Singhofen & Associates, Inc.January 27, 2015  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 Level of Service Evaluations

7. Singhofen & Associates, Inc.January 27, 2015  System Performance Evaluation For Homes:  Home flooding evaluated relative to base flood (i.e., 100-year storm)  City has required 1 foot of freeboard above 100-year elevation Level of Service Evaluations Freeboard

8. Singhofen & Associates, Inc.January 27, 2015 Section 30 (“R” Section) – Level of Service

9. Singhofen & Associates, Inc.January 27, 2015  Section 30 (“R” Section)  High water levels due to:  Constrictions between residential areas and primary canal system  Low ground or road elevations relative to downstream road elevations or flood stages in Pine Grove Canal  2 homes predicted to flood in a 100-year event  Number of homes below City requirement for 100- year event = 19 %  9 Locations with secondary drainage deficiencies for 10 year event  Nuisance flooding (2-year event) at 8 road crossings Modeling Results

10. Singhofen & Associates, Inc.January 27, 2015 Section 30 (“R” Section) – Level of Service Deficient secondary roads = 9 Secondary drainage deficiencies

11. Singhofen & Associates, Inc.January 27, 2015 Section 34 (“E” Section) – Level of Service

12. Singhofen & Associates, Inc.January 27, 2015  Section 34 (“E” Section)  High water levels due to:  Constrictions between residential areas and primary canal system  Low ground or road elevations relative to downstream road elevations or flood stages in East Hampton Canal  No homes are predicted to flood in a 100-year event  Number of homes below City requirement for 100-year event = 18 %  4 Locations (Nodes) with secondary drainage deficiencies for 10 year event  Nuisance flooding (2-year event) at 25 road crossings Modeling Results

13. Singhofen & Associates, Inc.January 27, 2015 Section 34 (“E” Section) – Level of Service Deficient secondary roads = 4 Secondary drainage deficiencies

14. Singhofen & Associates, Inc.January 27, 2015 Recommended Improvement Plan  Section 30 Improvements:  Ditch and Pipe Modifications along Seven Locations Cost $370,600 Cost $240,800 $611,400  Section 30 Level of Service Improvements:  Homes below 100-year City requirement reduced to 17 %  Roadway Deficiencies Eliminated  Section 34 Improvements:  Ditch and Pipe Modifications Along Two Locations  Section 34 Level of Service Improvements:  Homes below 100-year City requirement reduced to 16 %  Roadway deficiencies eliminated Grand-Total

15. Singhofen & Associates, Inc.January 27, 2015  “R” Section (Section 31) Improvements - 2012  Ditch and Pipe Modifications  (Richardson Drive to Richmond Drive)  Construction Cost = $130,530  Engineers Estimate = $215,000 2012-2013 Program Results

16. Singhofen & Associates, Inc.January 27, 2015 2013-2014 Program Results  “B” Section (Section 35) Improvements - 2014  Ditch and Pipe Modifications  (Bunker Hill Drive to Burnaby Lane)  Construction Cost = $145,000  Engineers Estimate = $220,700

17. Singhofen & Associates, Inc.January 27, 2015 2014-2015 Program  “L” Section (Section 37) Improvements – 2014-2015  Ditch and Pipe Modifications  (Lindsay Drive to Lansing Lane)  Engineers Estimate = $220,000

18. Singhofen & Associates, Inc.January 27, 2015 Current & Future Work

19. Singhofen & Associates, Inc.January 27, 2015 Current Work in Design Based on Model Modeling Completed / Design PendingCosts  Section 30 Est. Construction Costs$370,600  Section 34 Est. Construction Costs$240,800  Permitting Cost$25,338 Future Work in Design Based on Model Section 31 “R” – Phase 2  Section 31 Phase 2 Est. Construction Costs$733,800  Permitting / Utility coordination Cost $30,000 Sections 35&37 Capital Improvement  Est. Construction Costs$3,339,200  Permitting Cost$50,000 Future Model Development  Sections 1 & 2“F” Model Cost$46,615  Permitting Cost$25,000 Current & Future Work Grand-Total $4,861,353

20. Singhofen & Associates, Inc.January 27, 2015  Sections 30 and 34 Expectations  Continue Maintenance and Selective Improvements  City Swale and Ditch Maintenance Has Reduced Future Capital Cost Lessons Learned?