Drainage Study Sections 31 & 35/37
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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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Prepared by

  • 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


Prepared by

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


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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


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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


Section 31 r section level of service

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


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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


Section 31 r section recommended improvements

Culvert replacement and ditch modifications

Bypass ditch with outfall to Royal Palms Canal

Section 31 (“R” Section) – Recommended Improvements


Section 35 b section level of service

Secondary drainage deficiencies

Section 35 (“B” Section) – Level of Service

Deficient secondary roads = 2


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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


Section 35 b section recommended improvements

Culvert replacement and ditch modifications

Section 35 (“B” Section) – Recommended Improvements


Section 37 l section level of service

Secondary drainage deficiencies

Section 37 (“L” Section) – Level of Service

Deficient secondary roads = 6


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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


Section 37 l section recommended improvements

Culvert replacement and ditch modifications

Section 37 (“L” Section) – Recommended Improvements


Sections 35 37 recommended capital improvements

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


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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 Citystandard reduced by 43 %

Nuisance flooding eliminated

Sub-total


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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 Citystandard reduced by 61 %

Roadway deficiencies eliminated

Sub-total

$159,700


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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 Citystandard reduced by 69 %

Roadway deficiencies eliminated

Sub-total

$364,600


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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 Citystandard reduced by 63 %

Homes remaining below 100-year City standard = 4 %

All secondary deficiencies eliminated

Sub-total

$3,339,200


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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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