Minsi Lake Dam Public Meeting October 3, 2016 Paul Urbanik, P.E.

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Presentation transcript:

Minsi Lake Dam Public Meeting October 3, 2016 Paul Urbanik, P.E. Chief of Engineering Mission: To protect, conserve, and enhance the Commonwealth’s aquatic resources and provide fishing and boating opportunities

Overview Dam Overview Dam Deficiencies and Drawdown Rehabilitation Alternatives Working Estimates Timetable – Construction & Refill

Minsi Lake

Minsi Lake Dam Earthen embankment dam & concrete outlet works Constructed 1970 Pond surface area (normal pool) – 117 acres Drainage area – 3.7 square miles East Branch of Martins Creek Maximum depth – 26.5 feet Maximum storage volume – 1,793 acre-feet (584 million gallons) (47 years old, design life for typical structures = 50 years)

Minsi Lake Dam Constructed by J.H. Beers Inc. Purpose – fishing and boating recreation

Blue Mountain Dr. Minsi Lake Launch Parking Launch and Parking Dam Lake Minsi Dr. East Shore Dr.

Auxiliary Spillway Primary Spillway Dam East Br. Martins Creek

PA Code Title 25 Chapter 105 Dam Deficiencies Department of Environmental Protection Chapter 105. Dam Safety and Waterway Management Dam Deficiencies 105.94 Spillway Structural Stability 105.96 Outlet Works Capacity 105.98 Design Flood Criteria 105.136 Unsafe Dams

Structural Stability - Spillway NEW DESIGN OLD DESIGN

Spillway Capacity Spillway Capacity Spillway Integrity East Br. Martins Creek

Spillway Capacity

Hazard Area

Rehabilitation Concept Construct new reinforced concrete spillway capable of conveying the Probable Maximum Flood (Labyrinth Spillway) Proposed Spillway, To be constructed Existing Spillway, To be demolished

Rehabilitation Concept Raise Top of dam approximately 2.3’

Construction

Construction

Construction

Construction

Fish Habitat Rock Rubble Humps

Spider Humps & Felled Trees Fish Habitat Spider Humps & Felled Trees

ADA Access

Project Cost Estimate Working Estimate: $4,000,000 Costs include: Design Engineering Geotechnical analysis Survey and property Environmental and Historic assessments Dam Break analysis Permitting Property Acquisition (flowage easements) Construction Contract ($3.0M) Field QA by design engineer

Next Steps Fish Salvage Obtain dam safety permits and DGS authorization to advertise construction contract Construct Dam Rehabilitation

Fish Salvage Draw down reservoir (4-6 weeks) April-May 2017 Fish Salvage (1-2 days) June 2017 Fish mortality is expected as part of the process Fish moved to Brady's Lake Participants Include: Fisheries Staff Hatchery Staff Maintenance Staff Law Enforcement Staff

Fish Salvage

Fish Salvage

Fish Salvage

Rehabilitation Timeline Minsi Lake Dam Rehabilitation Timeline DEP Dam Safety Permits Dec 2016 DGS Approval & Advertise Spring 2017 Drain reservoir & salvage fish April/June 2017 Construction Summer 2017 – 2018 Habitat Construction Spring 2018 Refill reservoir Spring 2019– Summer 2019

Questions & Answers Tim Schaeffer, Director, Policy & Planning Paul Urbanik, Chief of Engineering Dave Arnold, Fisheries Manager Area 5 Ray Bednarchik, Captain, SE Region Law Enforcement

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