SLIDE 1
Lak Lake e Sha hamin mineau eau
Hi High gh Wat ater r Ou Outlet tlet Project roject
Current Lake Shamineau Water Level
OHW 1075.1 Source: DNR Lake Finder
Highest Recorded 1277.14 Ordinary High Water Level 1275.1
Lak Lake e Sha hamin mineau eau Hi High gh Wat ater r Ou - - PowerPoint PPT Presentation
Lak Lake e Sha hamin mineau eau Hi High gh Wat ater r Ou - - PowerPoint PPT Presentation
Lak Lake e Sha hamin mineau eau Hi High gh Wat ater r Ou Outlet tlet Project roject Current Lake Shamineau Water Level Highest Recorded 1277.14 Ordinary High Water Level 1275.1 OHW 1075.1 Source: DNR Lake Finder Precipitation
SLIDE 2
SLIDE 3
Precipitation Patterns of Area
Source: Houston Engineering Feasibility Report 27.24 Inches
SLIDE 4
Lake Shamineau: Alternatives Considered
Houston Engineering Report
- No Action (Damage Would Continue)
- Property Buyout ($16 Million Estimate)
- Southwest Bound Outlet
- Northeast Bound Outlet
WSN Focused on the Northeast Bound Outlet
SLIDE 5
Lake Shamineau Hydrogeology
Groundwater Flow Direction
SLIDE 6
Hydrogeologic Investigation
SLIDE 7
Rotosonic Drilling
SLIDE 8
Rotosonic Drilling Core
Boring B-1: 74.5 feet below the surface – coarse- grained sand with gravel.
SLIDE 9
Geologic Cross-Sections
SLIDE 10
Hydrogeologic Cross-Sections
W
SLIDE 11
Hydrogeologic Cross-Sections
SLIDE 12
Infiltrometer and Percolation Testing
Infiltrometer Test
- 5.625 Feet Per Day
Percolation Testing
- 195.65 Feet Per Day
- 197.50 Feet Per Day
SLIDE 13
MGS Sand Models
Prepared by Minnesota Geological Survey (MGS)
- Prepared for Morrison County Geologic Atlas
- Look at Well Records and Other Geologic Data
- Model Sand Layer Thickness for Many Layers
- Provide GIS Shape Files for Use in Other Studies
SLIDE 14
Surficial Sand Model Thickness
SLIDE 15
Northeast Outlet Discharge Options
- Pumping to Perch Lake
- Direct Boring to North of Stanchfield Lake
- Pumping to Wetland North of Ridge
- Pumping to the Gravel Pit for Infiltration
SLIDE 16
DNR Grant Requirements
Flood Hazard Mitigation Grant Assistance
- Purpose: Funds for Studies and Damage Reduction
- Eligible Projects: Flood Damage Reduction, Flood
Protection, and Water Level Control
- Who Can Apply: Local Government Units Including
Lake Improvement Districts
- Level of Assistance: 50% of Eligible Costs
Need to Identify the Project or Outlet
SLIDE 17
Step 1 -Preliminary Engineering Report
- I. Introduction
- Background
- Project Description
- Hydrologic and Hydraulic Data
- II. Project Sizing Analysis
- III. Project Economic Analysis
- IV. Feasibility
- V. Next Steps
SLIDE 18
Step 2 - Other Project Review
Little McDonalds, Krebs, and Paul LID Teamed with Devils Lake LID near Perham, MN
- Two Pumping Structures
- Pump Water 5 Miles
- Started Pumping Last
September
- Looked at Several Routes
- ”Problem Solved”
SLIDE 19
Lake Shamineau: Project Sizing
- Lake Shamineau has risen 1.7 feet in one
year
- Require removal of 2,438 acre feet of water
in one year
- Pumping rate of 3,680 gallons per minute in
150 days
- Design for 4,500 gallons per minute to
handle down time
- Piping would be 18-inch forcemain
SLIDE 20
Lake Shamineau: Project Options
Alternative 1. North Pumping Route Alternative 2. South Pumping Route Alternative 3. Gravity Line to Wetland Area with Pumping Station in Wetland to Gravel Pit
SLIDE 21
Lake Shamineau: Intake Screen Design
- Intake Screen
- Stainless Steel
- Gravity Flow to Pumping Station
- No Suction
- Cleaned with Jets System
Beebe Lake by St. Michael, MN Little McDonald Lake Intake
SLIDE 22
Lake Shamineau: Intake Screen Design
Devils Lake Intake Structure
- Underwater
- 75 feet from shore
- Buoys marking location
- Safe
SLIDE 23
Lake Shamineau: Pumping Structure
- Pumping Station
- One Pump – 2,750 gpm
- Two Pumps – 4,500 gpm
SLIDE 24
Lake Shamineau: Piping
- High Density Polyethylene (HDPE) For
Directional Drilled
- Polyvinyl Chloride (PVC) For Open Cut
Trenches
- 18-Inch Diameter Forcemain
SLIDE 25
Lake Shamineau: Infiltration Basins
- Wet / Dry Cycle Operation
- Three Basins
- Weekly Rotation
Infiltration Basins at Camp Ripley
SLIDE 26
Lake Shamineau: Groundwater Modeling
Scenario 3
- Three Basins
- Hydraulic Conductivity = 115 ft/day
- Three Feet Per Day Loading
SLIDE 27
Lake Shamineau: Groundwater Modeling
Scenario 12
- Two Basins
- Hydraulic Conductivity = 115 ft/day
- Ten Feet Per Day Loading
SLIDE 28
Lake Shamineau: Downstream Effects
- Water Levels High In Downstream Wetlands
- Infiltrated Water Will Move North/Northeast
- Some Will Flow Out Stanchfield Lake Outlet
SLIDE 29
Anticipated Permits for Lake Shamineau High Water Project
- USACE Section 404
- MNDNR Public Waters Work
- MPCA Construction Stormwater Permit
- Morrison County CUP
- Morrison County SWCD Wetland Permit
SLIDE 30
Next Steps for Lake Shamineau High Water Outlet Project
SLIDE 31
Step 1: Route Alternative Analysis
- Agency Discussion
- Discharge Location Landowner
Discussion/Contact
- Hydrogeologic Investigation
- Alternative Analysis (infiltration & Direct
Discharge)
- Preliminary Cost Estimation
Completed
SLIDE 32
Step 2: Surveying and Detailed Design
- Onsite Surveys
- Landowner Contacts For Route
- Detailed Preliminary Design
- Preliminary Operational Plans
- Water Control Plan
- Contingency Plan
- Revise Cost Estimates and Schedule
- Preliminary Permitting Requirements
Ongoing
SLIDE 33
Step 3: Final Plan and Permitting
- Environmental Assessment Worksheet (EAW)
- Permitting & Utilities Agreements
- Right-of-Way (Easement) Descriptions
Fall 2019
SLIDE 34
Step 4: Final Design & Specifications
- Finalize Design Alternative
- Bid Documentation & Advertisement
- Contractor Selection
Over Winter
SLIDE 35
Step 5: Construction
- Finalize Property Agreements
- Construction
- Grant Reimbursement
Next Spring
SLIDE 36
Tha Thank Y nk You!
- u!