Harris Pond Dam

Masonry Reconstruction
Nashua, New Hampshire

The Turner Group was selected for the design and construction administration for the Harris Pond Dam Masonry Restoration.  Work includes a new spillway cap with four manual gates, new 6’x6’ deep gate, intake, gate house, and liner for the existing 5’ diameter penstock for the 35’ high ashlar, stone masonry arch dam.

 

Winooski One Hydroelectric

Winooski OneHydroelectric Station and Waterfront Park

Winooski One Hydroelectric

Burlington/Winooski, VT

Under the jurisdiction of the FERC this multi-faceted, multi-million dollar development project involved the design, permitting, and construction of a new reinforced concrete powerhouse, dam sections, two 8-foot high inflatable rubber spillways, a mechanical fish elevator system, waterfront parkway, heated trashrack deck, and a pneumatic air blaster for the removal of trashrack debris. The powerhouse is capable of withstanding 5 ft. of water over the top of the roof and accommodations for environmentally sensitive plant species.

The 7.4-megawatt hydroelectric facility with 3 bevel gear turbines is located on the Winooski River immediately upstream of Lake Champlain bordering Burlington and Winooski, Vermont.

Project amenities include a fish elevator system complete with a fish trapping, sorting and trucking station. A waterfront parkway designed for handicap accessibility includes brick walkways, cast-iron tree wells, decorative guardrails, site lighting, retaining walls, and project plantings. Also included are an access tunnel, a 20-ton overhead crane, a heated trash raking deck, hydraulic trash rack vibrators and an intake air blaster system and heavy concrete restoration.

Ottaquechee River

Minimum Flow Turbine Installation
Ottaquechee River, Windsor County; North Hartland, VT

North Hartland 1The Turner Group was retained to complete an evaluation and perform the structural design for the renovation of an existing 64,800 SF retail space into a Wal-Mart.

Turner Group visited the site to measure and evaluate the existing structural system and performed all structural designs to bring the existing structure into conformance with current code requirements.  Construction drawings and specifications for the structural work were produced and construction administration was provided.


Royal Mills

Royal MillsRoyal Mills, Pawtuxet River—West Warwick, Rhode Island

Originally built in 1890, Royal Mills in West Warwick, Rhode Island operated as one of the world’s busiest hydro-powered cotton mills for over 30 years but was eventually abandoned.   As part of a restoration and conversion of the mill building into residential condominiums, The Turner Group designed a renovation of all of the hydropower components in order to reactivate them.

Although the hydropower components were in poor condition the dam was in acceptable condition so our team designed the rehabilitation and installation facets that included the installation of a 350 kilowatt Ossberger Cross Flow turbine, a new 6 ft. diameter steel penstock, canal rehabilitation, and new intake and headgates.

The project is a model for the conversion of abandoned New England mill buildings that can be repurposed and repowered.

 

Highgate Falls Hydroelectric

Highgate FallsHydroelectric Station Upgrades

Highgate Falls Hydroelectric—Swanton, Vermont

Under the jurisdiction of the FERC, this project upgrade for additional power production included installation of one of the largest pneumatic crest control “gates” in North America. The 15’ high by 240’ long inflatable rubber spillway was installed with automatic controls, a sealed access hatch for future maintenance, and a decompression chamber adjacent to the spillway for any access periods of long duration.

The pneumatic spillway was installed on top of a new 5’ thick reinforced concrete “cap”. The entire installation was structurally stabilized by the design of a series of multi-strand, 600kip post-tensioned, tendon rock anchors. The anchor installation included the monitoring of the applied anchor force by permanently installed vibrating wire technology load cells.

As a follow-up to the original project upgrade, a minimum flow Ossberger cross flow turbine was installed in the previously designed and constructed reinforced concrete powerhouse shell. This replaced wasted minimum water flows with power production capacity.

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