white rock lake redging feasibility study
TRANSCRIPT
![Page 1: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/1.jpg)
Community Meeting #1 – January 28, 2020
W H I T E R O C K L A K E
D R E D G I N G F E A S I B I L I T Y S T U D Y
![Page 2: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/2.jpg)
2
Meeting InformationPurpose of Meeting
1. Provide maintenance updates from Dallas Water Utilities
2. Provide background and objectives of dredging feasibility study
3. Gather input from community and user groups
![Page 3: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/3.jpg)
Dallas Water Utilities Announcements
• Decommission existing and install new piezometers
• Repair existing upstream (lake-side) dam slope protection and hardening
• Harden downstream earthen slope
• Repair dam spillway concrete cracking and spalling
3
White Rock Lake Dam Maintenance Improvements
![Page 4: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/4.jpg)
Dallas Water Utilities Announcements
• Inspect existing stoplogs for repair or replacement
• Manage vegetation at multiple locations
• Address 2019 inspection observations (minor changes since previous 5-yr inspection)
– Does not address increase of spillway hydraulic capacity
• Timeline:
– Spring 2020 - Advertise Construction
– Winter 2020/2021 – Begin Construction
– Fall 2022 - Complete Construction**weather dependent
4
White Rock Lake Dam Maintenance Improvements
![Page 5: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/5.jpg)
Background Information
5
![Page 6: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/6.jpg)
BackgroundFeasibility Study
What is a Feasibility Study?
6
Feasibility studies are conducted primarily to determine:
▪ Key goals of the project.
▪ Alternative solutions and associated costs.
▪ Potential project roadblocks (risk factors).
▪ Project requirements and expected timeline.
![Page 7: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/7.jpg)
BackgroundFeasibility Study
• Dallas Park & Recreation Department partnering with Dallas Water Utilities on high-level feasibility study including:
• Approaches for dredging
• Regulatory requirements for dredging
• Costs associated with design and dredging activities
• Potential funding sources for dredging projects
• Freese and Nichols hired as engineering consultant• Brownstone providing environmental consulting
7
![Page 8: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/8.jpg)
End
ReportingIncorporate Feedback
Final Recommendations
Final Feasibility Study Report
May/2020
FindingsDraft Results
Community
Input
Apr-May/2020
FundingSources
Requirements
Timelines
Apr/2020
AnalysisMethods
Alternatives
Risk Factors
Sediment Testing
Regulations
Costs
Feb-Mar/2020
Data GatheringHistoric Dredging
Site Visit
Community Input
Project Goals
Start
TimelineFeasibility Study
Dec/2019 Jan/2020
8
![Page 9: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/9.jpg)
SummaryFeasibility Study
Identify Project
Gather Community
Input
Analyze
Alternatives
Determine Feasibility
Engineering Plans
9
![Page 10: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/10.jpg)
Meeting InformationFormat of Meeting
1. Presentation with interactive survey questions (1 hour)
2. “Come & Go” feedback stations (1 hour)
10
![Page 11: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/11.jpg)
Meeting InformationOpportunities for Feedback
• Online Google Form
• Comment Cards
• Interactive Survey*
• Feedback Stations
* Interactive Survey Results are from a small population sample and cannot be considered statistically significant.
11
![Page 12: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/12.jpg)
Meeting InformationOpportunities for Feedback
• Online Google Form tinyurl.com/white-rock-dredging
• Form will be active until February 11, 2020
12
![Page 13: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/13.jpg)
Meeting InformationOpportunities for Feedback
• Comment Cards
13
![Page 14: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/14.jpg)
Meeting InformationWhat is Mentimeter?
• Interactive Survey
• Uses Your Smartphone
• Results* Displayed Real-Time
* Interactive Survey Results are from a small population sample and cannot be considered statistically significant.
14
![Page 15: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/15.jpg)
Meeting InformationWhat is Mentimeter?
• Go to www.menti.com
• Use code 75 56 46
or
• Scan QR code (on screen and on FAQ card)
QR Code
* Interactive Survey Results are from a small population sample and cannot be considered statistically significant.
15
![Page 16: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/16.jpg)
16
![Page 17: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/17.jpg)
Meeting InformationOpportunities for Feedback
• Feedback Stations
• City of Dallas, FNI, and Brownstone staff available to answer questions
17
![Page 18: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/18.jpg)
Mentimeter Information
• Go to www.menti.com
• Use code 75 56 46
or
• Scan QR code (on screen and on FAQ card)
QR Code
* Interactive Survey Results are from a small population sample and cannot be considered statistically significant.
18
![Page 19: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/19.jpg)
19
![Page 20: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/20.jpg)
BackgroundUse of White Rock Lake Park
• 9.33-mile hike and bike trail
• Picnic areas
• Rental facilities: Winfrey Point and Big Thicket
• Fishing piers
• Sailing and rowing facilities
• Meeting and event facility: White Rock Bath House Cultural Center
• Dallas Arboretum
• Audubon Society-designated bird watching area and wetlands site
Recreational Lake
20
![Page 21: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/21.jpg)
21
![Page 22: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/22.jpg)
22
![Page 23: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/23.jpg)
23
![Page 24: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/24.jpg)
• Removing sediment from lake
• “Hydraulic Dredging” for White Rock Lake would use cutter suction head pump
• Restores water depth
BackgroundWhat is Dredging?
24
![Page 25: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/25.jpg)
• Cost
• Noise
• Smell
• Water Quality
• Sediment Dewatering & Disposal
• Site Disturbances
• Temporary Closures
• Suspended Sediment
• Wildlife Impacts
BackgroundConstruction Considerations
25
![Page 26: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/26.jpg)
• Improve conditions for water activities
• Water quality impacts
• Improve shoreline maintenance(i.e. trash and debris)
• Project will not provide flood control benefits
BackgroundDredging Benefits
26
![Page 27: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/27.jpg)
History of White Rock Lake
Dredging
1937 1955-56 1974 1996-9827
![Page 28: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/28.jpg)
• 1937– Completed in 3.5 years– 400,000 cubic yards of sediment removed – 90 acres of land reclaimed
• 1955-1956– 15,000 cubic yards of sediment removed
• 1974– 1,350,000 cubic yards of sediment removed– Sediment used to rebuild marshy areas– Creation of Mockingbird Point
History of White Rock Lake
Dredging
28
![Page 29: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/29.jpg)
History of White Rock Lake
Dredging 1996-98
• Last dredging completed in 1998
• Last study that preceded the dredging was in 1994• Study found that sediment impacted
oxygen levels in the summer, which could threaten the fish population
• Approximately 3,000,000 cubic yards of sediment removed
29
![Page 30: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/30.jpg)
History of White Rock Lake
Dredging 1996-98
• Bond-Funded Project
• 1995 Bond Funds - $9M
• DWU Revenue Bonds - $9M
• Reimbursed with stormwater revenues
• Cost savings realized when a landowner needed his gravel pit filled in Hutchins, Texas
• Dredge boat pumped sediment from the bottom of the lake through 24-inch pipes straight into the pit for 9 months
30
![Page 31: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/31.jpg)
31
![Page 32: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/32.jpg)
32
![Page 33: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/33.jpg)
33
![Page 34: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/34.jpg)
34
![Page 35: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/35.jpg)
35
![Page 36: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/36.jpg)
36
![Page 37: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/37.jpg)
Feedback Stations
37
![Page 38: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/38.jpg)
38
![Page 39: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/39.jpg)
39
![Page 40: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/40.jpg)
40
![Page 41: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/41.jpg)
41
![Page 42: WHITE ROCK LAKE REDGING FEASIBILITY STUDY](https://reader031.vdocuments.us/reader031/viewer/2022012514/618dd22125214f7c713f032a/html5/thumbnails/42.jpg)
42