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 Patterns of Area 27.24 Inches Source: Houston Engineering Feasibility Report
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
Lake Shamineau Hydrogeology Groundwater Flow Direction
Hydrogeologic Investigation
Rotosonic Drilling
Rotosonic Drilling Core Boring B-1: 74.5 feet below the surface – coarse- grained sand with gravel.
Geologic Cross-Sections
Hydrogeologic Cross-Sections W
Hydrogeologic Cross-Sections
Infiltrometer and Percolation Testing Infiltrometer Test - 5.625 Feet Per Day Percolation Testing - 195.65 Feet Per Day - 197.50 Feet Per Day
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
Surficial Sand Model Thickness
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
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
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
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”
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
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
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
Lake Shamineau: Intake Screen Design Devils Lake Intake Structure - Underwater - 75 feet from shore - Buoys marking location - Safe
Lake Shamineau: Pumping Structure - Pumping Station - One Pump – 2,750 gpm - Two Pumps – 4,500 gpm
Lake Shamineau: Piping - High Density Polyethylene (HDPE) For Directional Drilled - Polyvinyl Chloride (PVC) For Open Cut Trenches - 18-Inch Diameter Forcemain
Lake Shamineau: Infiltration Basins - Wet / Dry Cycle Operation - Three Basins - Weekly Rotation Infiltration Basins at Camp Ripley
Lake Shamineau: Groundwater Modeling Scenario 3 - Three Basins - Hydraulic Conductivity = 115 ft/day - Three Feet Per Day Loading
Lake Shamineau: Groundwater Modeling Scenario 12 - Two Basins - Hydraulic Conductivity = 115 ft/day - Ten Feet Per Day Loading
Lake Shamineau: Downstream Effects - Water Levels High In Downstream Wetlands - Infiltrated Water Will Move North/Northeast - Some Will Flow Out Stanchfield Lake Outlet
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
Next Steps for Lake Shamineau High Water Outlet Project
Step 1: Route Alternative Analysis - Agency Discussion - Discharge Location Landowner Discussion/Contact - Hydrogeologic Investigation - Alternative Analysis (infiltration & Direct Completed Discharge) - Preliminary Cost Estimation
Step 2: Surveying and Detailed Design - Onsite Surveys - Landowner Contacts For Route - Detailed Preliminary Design - Preliminary Operational Plans - Water Control Plan Ongoing - Contingency Plan - Revise Cost Estimates and Schedule - Preliminary Permitting Requirements
Step 3: Final Plan and Permitting - Environmental Assessment Worksheet (EAW) - Permitting & Utilities Agreements - Right-of-Way (Easement) Descriptions Fall 2019
Step 4: Final Design & Specifications - Finalize Design Alternative - Bid Documentation & Advertisement - Contractor Selection Over Winter
Step 5: Construction - Finalize Property Agreements - Construction - Grant Reimbursement Next Spring
Tha Thank Y nk You! ou!
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