Tech Briefs

IEEE releases guide to hydroelectric turbine governing systems

The Institute of Electrical and Electronics Engineers offers IEEE Guide for the Application of Turbine Governing Systems for Hydroelectric Generating Units.

IEEE says there is a heightened awareness within the electric utility industry of the importance of effective application of governing systems for dynamic stability.

This 131-page guide, called Standard 1207, is intended to complement Standard 125, IEEE Recommended Practice for Preparation of Equipment Specifications for Speed-Governing of Hydraulic Turbines Intended to Drive Electric Generators. The new standard provides details and addresses the impact of plant and system features on hydroelectric unit governing performance. The standard provides guidance for the design and application of hydro turbine governing systems.

— To buy a pdf for $105 ($85 for members) or the printed edition for $135 ($105 for members), visit and search for 1207.

Funding awarded to support fish passage work

Work under the National Fish Passage Program is taking place in Iowa, Illinois, Michigan, Minnesota, Wisconsin, Ohio and Missouri, thanks to an award of more than $1.5 million from the U.S. Fish and Wildlife Service.

This money will support the removal of 20 fish passage barriers, reconnecting more than 545 stream miles, as well as survey and monitoring activities. These projects are being supported by $3.2 million in non-federal funds.

Work being performed includes:

— Removal of Brown Bridge Dam in Grand Traverse County in Michigan and restoration of the stream channel and associated riparian corridor and wetlands. This will reconnect 145 stream miles;

— Removal of Montevideo Dam in Chippewa County, Minnesota, which will reconnect 18 stream miles; and

— Replacement of a low water crossing over the Little Niangua River in Dallas County, Missouri, to reconnect 6.1 stream miles.

The National Fish Passage Program uses a voluntary, nonregulatory approach to work with municipal, state, tribal and federal agencies, as well as nongovernmental agencies, to reopen and improve aquatic habitats in streams and rivers.

Participants in a hands-on training session held during the International RCC Dams Seminar, Study Tour and Training Session (RCC 2011) were allowed to hand-squeeze and walk on the prepared roller-compacted concrete.
Participants in a hands-on training session held during the International RCC Dams Seminar, Study Tour and Training Session (RCC 2011) were allowed to hand-squeeze and walk on the prepared roller-compacted concrete.

RCC conference includes study tour, training session

More than 90 people from 13 countries participated in the International RCC Dams Seminar, Study Tour and Training Session (RCC 2011), September 12 to 15 in Atlanta.

Sixteen speakers from the U.S., Australia and Mexico presented lessons learned from past performance and state-of-the-practice in the use of roller-compacted concrete (RCC) in dams. Both new RCC dams and rehabilitation of existing embankment dams with RCC overtopping protection were covered.

The 188-foot-high Hickory Log Creek Dam was the site of the study tour. The 980-foot-long dam, designed by Schnabel Engineering, was completed in 2007 to provide an additional water source for two fast-growing suburbs of Atlanta. Construction of the dam required 220,000 cubic yards of RCC, and the dam represents the first major use of exposed grout-enriched RCC in the U.S. Grout-enriched RCC was used for the steps for the non-overflow portions of the dam’s downstream face.

The training session, a demonstration on RCC placing and quality control, involved ASI Constructors bringing in a batch pugmill to produce two RCC mixtures. The first mix was a relatively lean, dry mix with a Vebe consistency time of about 30 seconds, and the second was a higher paste mix with a Vebe time of 15 seconds or less. Both mixes were spread and compacted in 12-inch-thick lifts with density testing performed. Attendees were allowed to hand-squeeze and walk on the compacted RCC for both mixes. In addition, the proper method for producing a grout-enriched RCC face was demonstrated, along with the proper method for preparing RCC cylinders using a vibrating hammer.

The seminar was sponsored by Schnabel Engineering.

Esri releases book on integrating hydraulic models, GIS

Esri announces Hydraulic Modeling and GIS, a book that specifies the steps necessary to effectively integrate hydraulic models with a geographic information system.

Through the well-designed integration of a hydraulic model with GIS, risk-of-failure analysis, repair and replacement, capacity assessment, capital improvement planning, and other water utility applications run more efficiently and effectively, Esri says.

According to the book, steps for a successful integration are:

— Establish a common vision among stakeholders, including data design;

— Develop a standard methodology for assigning unique identification to all utility assets;

— Reconcile GIS data to obtain a dataset suitable for ongoing hydraulic modeling;

— Define topology rules to ensure continued database integrity; and

— Migrate corrected and added features and attributes from the hydraulic model to the GIS.

The 82-page book was written in collaboration with the American Water Works Association, Water Environment Federation and International Water Association. The book is recommended for water, wastewater and storm water professionals, including engineers, managers, modelers, technicians and consultants.

Esri develops GIS solutions for various organizations.

— Purchase the book for $11.95 at or call (1) 800-447-9778.

PacifiCorp reroutes tailrace at Lemolo No. 2 project

Work has been completed on a project to reroute the tailrace at the 33-MW Lemolo No. 2 project on the North Umpqua River in south central Oregon. This rerouting was needed to eliminate ramping in this portion of the river.

Lemolo No. 2 is one of eight powerhouses in the 194-MW North Umpqua Hydroelectric Project. Discharge from Lemolo No. 2 has been rerouted to the Toketee Reservoir in accordance with the North Umpqua Settlement Agreement.

To complete this work, cofferdams were built to isolate the inlet and outlet structures, and construction took place from both ends. In total, 3,000 feet of pipe, supplied in 12-foot lengths by Oldcastle Precast, were buried along Toketee-Rigdon Road through the Toketee recreation area. This pipe includes 108-inch-diameter concrete pipeline at the inlet and outlet, with 96-inch-diameter concrete pipe in the middle.

The pipeline is t-lok lined in portions, and it makes multiple turns and grade changes. Inlet and outlet pieces were poured with steel rings cast into the pipe to allow connection to a cast-in-place head wall. Three T-Top manhole pipe sections were included for easy access into the pipeline.

Weekly Brothers Inc. was the general contractor and McMillen LLC was the project engineer. The work was completed at the end of October.

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