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Published byArron Harrington Modified over 9 years ago
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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
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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
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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
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Singhofen & Associates, Inc.January 27, 2015 City of Palm Coast Modeling Status
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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
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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
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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
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Singhofen & Associates, Inc.January 27, 2015 Section 30 (“R” Section) – Level of Service
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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
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Singhofen & Associates, Inc.January 27, 2015 Section 30 (“R” Section) – Level of Service Deficient secondary roads = 9 Secondary drainage deficiencies
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Singhofen & Associates, Inc.January 27, 2015 Section 34 (“E” Section) – Level of Service
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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
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Singhofen & Associates, Inc.January 27, 2015 Section 34 (“E” Section) – Level of Service Deficient secondary roads = 4 Secondary drainage deficiencies
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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
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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
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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
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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
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Singhofen & Associates, Inc.January 27, 2015 Current & Future Work
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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
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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?
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