Construction of Offshore Stormwater Discharges Using HDD Technologies. Karyn Erickson, D.CE., PE, President Erickson Consulting Engineers, Inc.
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1 Construction of Offshore Stormwater Discharges Using HDD Technologies Karyn Erickson, D.CE., PE, President Erickson Consulting Engineers, Inc. 1
2 Presentation Overview Introduction Project Need and Purpose Site Conditions Project Objectives and Design Design Considerations Construction Flamingo Beach Discharge Site Conclusion
3 Introduction Issues with Existing Beach Outfalls Eroding Shoreline vs. Accreting Shoreline 2 Solutions: Re-Route Discharges Landward Away from Dune Bypass the Dune and Marine Littoral Zone
4 Project Need and Purpose Existing Outfall Identified as Source of Fecal Coliform Causing Multiple Beach Closures Block Discharge Due to Accretion Localized Roadway Flooding Due to Back-up of Existing System During Seasonal Rainfall Events
5 Approximate Location of Existing Stormwater Pond Existing Vegetated Ditch Existing Outfall
6 Accreting Dune Existing Outfall
7 Site Conditions Accreting/Stable Shoreline (8 ft/yr) Wide Beach with Depth of Closure at (-18 ft NAVD 88 Public Beach Ranked #1 Beach in US in 2012 with High Recreational Use Absence of Hard-Bottom Features in Vicinity of Discharge
8 Approximate -18 ft Depth of Closure
9
10
11
12 Project Objectives and Design Prevent Erosion of Beach Dune and Littoral System via Offshore Discharge Treat Discharges for Particulate Matter and Fecal Coliform (Filtration and UV Disinfection) Improve Function of Existing System Diffuser System Limit Construction Impacts to Beach Dune
13 13
14 Contech Storm Filter
15 Contech Storm Filter
16 Acquionics In-Line UV Disinfection System
17 Pipeline Route Using HDD to Minimize Sea Oat Impacts
18
19 Design Considerations Pipeline Sizing Discharge Normal, Seasonal Rainfall (2 in/85 ac) Low Relief from Seafloor using HDD Placement Pipeline Placement To Depth of Closure (-18 ft NAVD88) Prevent Impacts to Nearshore Resources Diffuser Section Mixing Zone (8-10 fps Velocity - <150 ft) Durability and Low Maintenance Anchoring System Capacity (+/- 10,000 lbs force per anchor) Strapping (316 Stainless Steel)
20 Final Design Details Pipeline Material Pipeline Length Pipeline Placement Filtration System Bacteria Treatment System Discharge Capacity HDD Pipeline Below Seabed Depth of Emergent Pipeline Anchoring System Diffuser System 16 HDPE DR 9 (DIPS) Or 14 FPVC DR 18 (DIPS) 3,200 ft (from pump station) 3,090 ft (HDD placement) Horizontal Directional Drill (HDD) Storm Filter by Contech (40 siphon actuated, media-filled cartridges) UV Disinfection by Acquionics 1,000 GPM (2.5 in Rainfall Event) ft 18 ft 12 Chance Helical Anchors (w/ 10,000 lbs resistance each) Power Seal Tapping Sleeve 4.5 Tideflex Duckbill Diffuser (8-10 fps discharge velocity 8 diffusers)
21
22
23 Pipeline Fusion and Pull Box Process
24 Beach Road Stormwater Improvements Owner: Sarasota County, FL Engineer: Erickson Consulting Engineers, Inc. Contractors: Forsberg Construction, Inc. (Prime) Mears Group, Inc. (Driller) Orion Marine Group (Marine)
25 Flamingo Ditch Site Stormwater Improvements (Venice, FL) Pipeline Material Pipeline Length Pipeline Placement Filtration System Bacteria Treatment System Discharge Capacity HDD Pipeline Depth Depth of Emergent Pipeline Anchoring System Diffuser System 2-24 in ID HDPE or FPVC (2 pipelines running parallel) 1,000 ft Horizontal Directional Drill (HDD) Contech CDS Water Treatment Unit (vortex sediment removal) UV Disinfection by Acquionics 21,000 GPM (2 in Rainfall Event) ft 16 ft 20 Chance Helical Anchors (w/ +/-10,000 lbs resistance each) Power Seal Tapping Sleeve 3 Tideflex Duckbill Diffuser (8-10 fps discharge velocity 32 diffusers)
26 Flamingo Ditch Eroding Shoreline 26
27 Flamingo Ditch Designed
28 Flamingo Ditch Designed
29 Flamingo Ditch Designed
30 Conclusions Stormwater Discharge Treatment with Discharge Offshore is an Effective Solutions Removes Bacterial and Fine Sediments to Protect Nearshore Water Quality Eliminates Erosion of Nourished Beaches and Between Nourishments Backshore Flooding of Low Barrier Islands Eliminated
Construction of Offshore Stormwater Discharges using HDD Technologies
TM2-T2-04 Construction of Offshore Stormwater Discharges using HDD Technologies Karyn Erickson, PE, Erickson Consulting Engineers, Sarasota FL Bobbi Claybrooke, EI, Erickson Consulting Engineers, Sarasota
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