2024 02 15 AZ GOP LD4 Gen Meeting Minutes_FINAL_20240228.docx
Woodglen Lake Dredging and Restoration
1. Woodglen Lake Dredging and Restoration
Department of Public Works and Environmental Services
Project Update, September, 2013
2. Woodglen Lake: Meeting Agenda
Project Goals and Status
Woodglen Lake Conditions
Project Overview
Site Access and Decanting Basin Restoration
Dredging Approaches
Streambank Stabilization
Lake Habitat Restoration
Project Timeline
February Meeting highlights
Questions and Answers
3. Project Goals
Restore sediment pool and create in-lake forebay
Aesthetics
Long-term downstream water quality benefits
Improve lake water quality and habitat
Stabilize two stream locations to protect access
road
Remove existing decanting basin and provide long
term maintenance improvements
4. Woodglen Lake: Project Status
Data collection completed
Lake dredging and management plan completed
Design plans and specifications
Preliminary design – completed
Final design – current design phase
Permitting
Late 2013: complete final design
Begin construction in spring 2014
5. Woodglen Lake Facts
Drainage area =
740 Acres (1.15 square miles)
Lake surface area =
12.5 acres
Sediment pool capacity =
160,000 cubic yards (CY)
Current sediment in lake =
29,300 CY
Estimated annual sediment load =
1,200 CY / year
16.6 feet
29,300 CY
8. Woodglen Lake: Project Overview
Staging Area
Improved access
road
Sediment forebay
Lake dredging,
shoreline restoration,
lake habitat improvement
Removal and
restoration of decanting
basin
Potential
reforestation areas
9. Dredging Approaches
1. Wet Dredging: Mechanically dredge deposited
sediment and haul wet. Normal pool maintained.
(Note: This option will still require lake drawdown for
a short period of time to build the forebay berms)
2. Dry Dredging: Drain the lake and dry deposited
sediment in place prior to hauling
3. Project will be bid out with the option to dredge wet
or dry
Partial drawdown option for dry dredging: drawing the
lake down by 9 feet would leave a 3.5 acre pool; sediment
would be dried in the dewatered section of the lake in
place prior to hauling. Approximately 1/2 of the deposited
sediment volume would be removed.
12. Wet Dredging
General Sequence
Establish access and staging areas
Conduct dredging utilizing barges
Haul wet sediment to disposal site
for drying
Pros
Less weather dependent
Quicker initial start to dredging
Less potential for schedule
extensions or delay
Cons
Increased sediment handling effort
at disposal area
Potentially higher cost
13. Dry Dredging (Full or Partial Drawdown)
General Sequence
Initiate drawdown of lake
Establish access and staging areas
Establish diversion channels within lake
Conduct dredging
Pros
Higher daily sediment removal rates
Minimal sediment handling effort at
disposal area
Potentially lower cost
Cons
Very weather dependent
Higher potential for delays due to weather
Even with a reduced pool, there will be a
need to relocate/salvage fish
14. Huntsman Lake Dam Rehabilitation Project Fish Relocation (May, 2013)
15. Woodglen Lake: Partial Drawdown
Staging Area
A partial drawdown would leave a 3.5
acre pool with a maximum depth of 5
feet with an average depth of 1 to 2 feet.
Approximate volume of sediment to be
removed 15,000 CY
16. Lake Restoration
In-lake forebay
Wetland planting
Shoreline stabilization
Fish habitat
Fish stocking
Lake Barton:
Fish stocking by Virginia Game and Inland Fisheries
Fish habitat created from
salvaged trees
20. Fish Habitat Structures
Photos Courtesy of the Pennsylvania Fish and Boat Commission
Nesting Structure
Porcupine Crib Jr.
Rock Rubble Piles
Post Clusters
23. Access During Construction
Pedestrian
access to
lake from
Zion Drive
will be
maintained
(after hours)
Lake Barton
example
24. Woodglen Lake: Project Status and Timeline
Data collection completed
Lake dredging and management plan completed
Design plans and specifications
Preliminary design – completed
Final design – current design phase
Permitting
Late 2013: complete final design
Begin construction in spring 2014
25. Woodglen Lake Dredging and Restoration
Project Timeline
Early 2014: construction bid advertisement
Spring 2014: begin dredging
Dredging method will depend on bid results
Project duration: 6 to 7 months
26. February Meeting Discussion Highlights
Dry/Wet dredging: in order to ensure a competitive
bidding environment, both options have to be allowed,
with partial drawdown an option for dry dredging
Cheapest dredging method: depends on disposal site
identified, either method could be cheaper
Project cost-effectiveness: forebay and maintenance
enhancements make this project cost-effective from the
viewpoint of downstream water quality improvements
and long-term costs