18
Prepared by Prepared for City of Palm Coast, Florida March 12, 2013 Drainage Study Sections 30 & 34 for Development of City Wide Stormwater Management Master Plan
Prepared by
Prepared for City of Palm Coast,
Florida
March 12, 2013
Drainage Study Sections 30 & 34 for Development of City Wide
Stormwater Management Master Plan
Singhofen & Associates, Inc. March 12, 2013
Comprehensive Approach for Priority Criteria
Visual Inspections of Aging InfrastructurePipe Ratings
Historical Records from Rainfall EventsVisual Inspections of Stormwater SystemPublic Works High Water Signage Areas
Complaints (Service Orders) from CitizensCustomer Service Calls Combined With Follow Up Inspections
Other Special SituationsHigh Groundwater Areas
City of Palm Coast Modeling Priority
Singhofen & Associates, Inc. March 12, 2013
Section Numbers
Sections Already Modeled
Next Sections To Be Modeled
City of Palm Coast Modeling Status
1 2 3 4 5 6 7 8 9 10 11
12 13 14 15 16 17 18 19 20 21 22
23 24 25 26 27 28 29 30 31 32 33
34 35 37 39 57 58 59 60 63 64 65
81
Singhofen & Associates, Inc. March 12, 2013
City of Palm Coast Modeling Status
Singhofen & Associates, Inc. March 12, 2013
May 2009 Storm Event Rainfall totals range = 20 – 25 inchesRainfall ~ 300 Year – 5 Day storm
“R” Section (Section 30) :High water reported at or near homes at 3 locationsRoadway overtopping reported at approximately 5 locationsModel confirms storm conditions
“E” Section (Section 34) :High water reported at or near homes at 4 locationsRoadway overtopping reported at approximately 10 locationsModel confirms storm conditions
Current Study Findings
Singhofen & Associates, Inc. March 12, 2013
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
Singhofen & Associates, Inc. March 12, 2013
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
Singhofen & Associates, Inc. March 12, 2013
Section 30 (“R” Section) – Level of Service
Singhofen & Associates, Inc. March 12, 2013
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
Singhofen & Associates, Inc. March 12, 2013
Section 30 (“R” Section) – Level of Service
Deficient secondary roads = 9
Secondary drainage deficiencies
Singhofen & Associates, Inc. March 12, 2013
Section 34 (“E” Section) – Level of Service
Singhofen & Associates, Inc. March 12, 2013
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 eventNuisance flooding (2-year event) at 25 road crossings
Modeling Results
Singhofen & Associates, Inc. March 12, 2013
Section 34 (“E” Section) – Level of Service
Deficient secondary roads = 4
Secondary drainage deficiencies
Singhofen & Associates, Inc. March 12, 2013
Recommended Improvement Plan
Section 30 Improvements:Ditch and Pipe Modifications along Seven Locations
Cost$360,200
Cost$254,100
$614,300
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
Singhofen & Associates, Inc. March 12, 2013
“R” Section (Section 31) Improvements - 2012Ditch and Pipe Modifications
(Richardson Drive to Richmond Drive)Construction Cost = $130,530Engineers Estimate = $215,000
2012 Program Results
Singhofen & Associates, Inc. March 12, 2013
Current & Future Work
Singhofen & Associates, Inc. March 12, 2013
Current Work in Design Based on ModelSection 35 “B” & Section 37 “L” CostsSection 35 Est. Construction Costs $159,700Section 37 Est. Construction Costs $364,600Permitting Cost $32,327Modeling Completed / Design PendingSection 30 Est. Construction Costs $360,200Section 34 Est. Construction Costs $254,100Permitting Cost $25,338
Future Work in Design Based on ModelSection 31 “R” – Phase 2Section 31 Phase 2 Est. Construction Costs $733,800Permitting / Utility coordination Cost $30,000 Sections 35&37 Capital Improvement Est. Construction Costs $3,339,200Permitting Cost $50,000
Future Model DevelopmentSections 1 & 2“F” & 11 “B” Model Cost $66,235Permitting Cost $25,000
Current & Future Work
Grand-Total $5,440,500
Singhofen & Associates, Inc. March 12, 2013
Section 34 ExpectationsContinue Maintenance and Selective ImprovementsCity Swale and Ditch Maintenance Has Reduced Future Capital Cost
Lessons Learned?
