LIHI Certificate #106 - Greenville Project, Connecticut

Greenville Project, LIHI #106
Nombre del proyecto Greenville
Certificado LIHI No. 106
Plazo del certificado LIHI
 March 6, 2018 – March 5, 2028
Dueño Servicios públicos de Norwich
Estado Connecticut
Ubicación Located at river mile 1.3 on the Shetucket River in the City of Norwich, New London County, Connecticut.
Capacidad instalada Total 2.2 MW

10th Street: 1.4 MW

2nd Street: 0.8 MW
Generación media anual 4,825 MWh
Tipo de instalación De pasada
Comisión Federal de Comercio No. P-2441 issued in 1993, expires 12/31/2043

The Greenville Project is located in Norwich, CT at the cabeza of tide on the Shetucket River, where it spans the river in a generally east-west direction. The presa is the most downstream dam on the Shetucket River. Upstream about 5 miles is the Occum Project (LIHI #105). The reach below the dam is subject to tidal influence. At its mouth, the Shetucket River combines with the Yantic River to form the Thames River 15 miles upstream of Long Island Sound in New London, Connecticut. The Thames River basin is the third largest major river basin in Connecticut.

The project is comprised of an impoundment, cuna de madera dam, paso de peces facilities, gatehouse, a canal, canal aliviadero, the Second Street central eléctrica located at the canal end and additional powerhouse, known as the Tenth Street Station, located approximately 800 feet downstream from the canal headworks.

The gatehouse, canal, canal spillway, and powerhouse are located along the west bank. The Eight Street Bridge spans the canal and river approximately halfway between the dam and the Second Street powerhouse. The dam is of masonry and timber construction, with a spillway length of 399 feet and a tablero de flash height of 1.3 feet. The gatehouse is separated from the dam by masonry-lined earth fill embankment and has six timber puertas, each approximately 11 feet wide by nine feet high, which admit water to the canal.

The canal is earth lined, approximately 3,200 feet in length, 70 feet wide and 13 feet deep. The canal runs parallel to the river. The canal spillway is constructed of concrete, masonry and timber material. There are twelve concrete formed spillway sections, each approximately 7.7 feet wide. The spillway crest elevation is approximately 19 feet (USGS datum), with an additional two feet of Detener registros in each section.

The Second Street powerhouse is located at the end of the canal, approximately 3,200 feet downstream of the dam. The Second Street powerhouse contains two vertical Turbinas Francis with a total installed capacity of 0.8 MW.

The Tenth Street powerhouse is located 800 feet downstream from the canal headworks and includes a 15-foot-deep, 30-foot-wide by 80-foot-long concrete intake canal artificial. The powerhouse containing one horizontal Kaplan turbine/generator unit with an installed capacity of 1.4 MW and a short tailrace discharging into the bypass reach.

El proyecto opera en un de pasada mode and impounds an 80-acre reservoir. The project provides a continuous minimum flow of 250 cfs through spillway flashboard notches and the fish passage facilities from combined flows of 100 cfs through the upstream fish passage system; 50 cfs through the downstream fish passage system; and 100 cfs through flashboard notches across the dam. This flow regime was developed in consultation with the Connecticut Department of Energy and Environmental Protection (CTDEEP) and USFWS.

Waters within the project reach are listed as impaired for recreation due to bacteriological contamination in the downstream reach. The likely cause of the impairment are illicit discharges, stormwater runoff, or sewer overflows. CTDEEP has confirmed that the project operates in a manner that does not adversely impact water quality.

Resident fish species of the Shetucket River include American shad, river herring, gizzard shad, hickory shad, striped bass, sea-run brown trout, sea lamprey, white perch, pickerel, smallmouth and largemouth bass, bluegill, rainbow smelt, and American eel. The upstream fish passage facility consists of an automated fish elevator system with an associated attraction water system. The elevator system is comprised of a 43.5-foot-long by 8-foot-wide lower entrance and collection chamber and a 58-foot-long, 8-foot-wide elevated exit flume. The elevated flume is equipped with a floor attraction water screen, trapping facilities, attached viewing room and a maintenance gate for dewatering. Attraction flow is supplied through a series of pipes from the headpond and exit flume. The system has been operational since 1996.

An upstream escalera de anguila is attached to the upstream fish passage system. The eel ladder consists of an elevated 20-inch-wide aluminum trough with a strip drain interior surface and aluminum cover plate. Water for the eel ladder is supplied by a submersible electric pump located within a vertical standpipe near the fish ladder exit flume. The system has been operational since 2003.

The downstream fish passage facility consists of a 1-inch clear-spaced angled bar racks, entrance chamber, buried transport pipe and submerged piscina de inmersión. The angled bar rack is approximately 85 feet in length and 17 feet high and equipped with an automated rack cleaning system. The entrance chamber is approximately 9.5 feet long, 4 feet wide and 9.5 feet deep and equipped with a downward opening entrance flow control gate. A 36-inch buried steel transport pipe connects to the downstream end of the entrance chamber and discharges into the bypass reach. The riverbed directly beneath the transport pipe has been excavated to form a deep plunge pool into the 3,200-foot-long bypass reach. The system has been operational since 1995 and CTDEEP has concluded that passage measures at the project are effective.

The project lands consist of roughly 5.3 acres. The area surrounding the project is primarily developed with industrial, commercial, and urban residential land use. Native grasses and herbaceous growth can be found in the project area, but no lands of significant ecological value are located in the project vicinity.

Threatened or endangered species potentially present in the project vicinity include the Northern Long-eared bat, bald eagle, and blueback herring. No critical habitats for listed species exist in the project area. Fish passage facilities minimize project impacts on the state-listed blueback herring and no project impacts are expected for bald eagles that may visit the project. United States Fish and Wildlife Service and the CTDEEP confirmed that project operation would not impact any protected species.

Cultural resources in the project area include the Greenville dam which is eligible for listing on the Registro Nacional de Lugares Históricos as part of the Greenville Industrial Historic District. Consultation with the State Historic Preservation Office is required prior to any planned ground disturbance. The project has implemented a dam repair and maintenance program to maintain the structural integrity of the dam using materials similar to the structures being replaced.

Recreational resources at the project include a canoe portage. Public access is provided free of charge.

Estado de cumplimiento

En el Certificado actual no existen condiciones específicas para ninguna instalación.

2025: No se identificaron cambios materiales ni problemas de cumplimiento. El proyecto sigue cumpliendo con los requisitos según la revisión anual.

2024: No se identificaron cambios materiales ni problemas de cumplimiento. El proyecto sigue cumpliendo con los requisitos según la revisión anual.

2023: No se identificaron cambios materiales ni problemas de cumplimiento. El proyecto sigue cumpliendo con los requisitos según la revisión anual.

2022: No se identificaron cambios materiales ni problemas de cumplimiento. El proyecto sigue cumpliendo con los requisitos según la revisión anual.

2021: No se informaron cambios ni problemas de cumplimiento. El proyecto sigue cumpliendo con los requisitos según la revisión anual.

2020: No se informaron cambios ni problemas de cumplimiento. El proyecto sigue cumpliendo con los requisitos según la revisión anual.

2019: The project reported replacement of canal cross rack grates to improve flows in the canal. The project remains in compliance based on the annual review.

2018: La presentación de informes anuales para el Certificado actual aún no ha entrado en vigor.

Historial de certificaciones

1 de enero de 2022: El plazo del Certificado LIHI se ha extendido de acuerdo con la Revisión 2.05 del Manual de Certificación LIHI 2.ª Edición emitido el 1 de enero de 2022. Consulte la tabla de instalaciones anterior para conocer el nuevo plazo.

July 13, 2018: The 30-day appeal window for the preliminary certification decision of the Greenville Hydroelectric Project closed on July 12, 2018 with no appeals to the decision received. The decision is therefore final and the Greenville Hydroelectric Project is recertified for a term from March 6, 2018 through March 5, 2023.

12 de junio de 2018:  On June 11, 2018, the Greenville Project received preliminary approval for a new 5-year term of Low Impact Certification.

Esta decisión es preliminar y está pendiente del período de apelación de 30 días. Solo aquellos que comentaron en el período de 60 días para comentarios de la solicitud inicial son elegibles para presentar una apelación. Dicha apelación debe incluir una explicación de por qué los proyectos no cumplen con los criterios de LIHI. Las solicitudes de apelación se pueden enviar por correo electrónico a comentarios@lowimpacthydro.org with “Greenville Hydroelectric Project” in the subject line, or by mail addressed to the Low Impact Hydropower Institute, 329 Massachusetts Ave, Suite 2, Lexington, MA 02420. All requests will be posted to the website and the applicant will have an opportunity to respond and any response will also be posted. Las solicitudes deben recibirse antes de las 5 p. m., hora del Este, el 12 de julio de 2018.  The full application and reviewers report are available at the bottom of this page. If no appeal requests are received and the decision becomes final, the new term for the Greenville Project will be March 6, 2018 through March 5, 2023.

11 de junio de 2018:  The Greenville Project certification term has been extended to July 15, 2018.

28 de febrero de 2018: The Low Impact Hydropower Institute has received a complete application for a new term of Low Impact Certification for the Greenville Hydroelectric Project. The Project is located in Norwich, CT on the Shetucket River approximately 1.3 river miles above the confluence with the Thames River and approximately 1.5 river miles below its confluence with the Quinebaug River. LIHI is seeking public comment on this application.  Specifically, we are interested in knowing whether you think the Project meets the LIHI Low Impact Certification Criteria, as revised in the 2nd Edition Handbook.  Please review the program and criteria in LIHI’s revised Manual y luego revise los materiales de solicitud del Proyecto 2018 publicados a continuación. Los comentarios que estén directamente relacionados con criterios específicos de LIHI (flujos, calidad del agua, paso de peces, etc.) serán de gran ayuda, pero se considerarán todos los comentarios. Los comentarios pueden enviarse al Instituto por correo electrónico a comentarios@lowimpacthydro.org with “Greenville Comments” in the subject line, or by mail addressed to the Low Impact Hydropower Institute, 329 Massachusetts Avenue, Suite 2, Lexington, MA 02420.  Los comentarios deben recibirse en el Instituto antes de las 5:00 p. m., hora del Este, el 29 de abril de 2018. Se considerarán todos los comentarios. Se publicarán en el sitio web y el solicitante tendrá la oportunidad de responder. También se publicarán todas las respuestas.

27 de febrero de 2018:  The Greenville Project certification term has been extended to May 31, 2018.

28 de mayo de 2013: The Greenville Hydroelectric Project has been certified as low impact for a five year term, effective March 6, 2013 and expiring March 6, 2018.

6 de mayo de 2013: El período de comentarios públicos sobre la solicitud ha cerrado.

6 de marzo de 2013: Norwich Public Utilities has submitted an application for the certification of its Greenville Hydroelectric Project; application has been posted and public comment period has opened.

Archivos de certificación

Recertificación 2018

Certificación 2013

Documentos clave