Tech Briefs

Weir at Little Goose improves fish passage efficiency

The temporary spillway weir (TSW) installed at the 810-MW Little Goose hydro project provides high probabilities of juvenile salmon and steelhead spill passage survival and high spill passage effectiveness, says Chris A. Pinney, fisheries biologist with the U.S. Army Corps of Engineers.

A TSW fits inside a dam’s spillway, raising the opening that allows water to pass and allowing juvenile fish to pass near the water surface. This provides a more efficient and less stressful passage route than does diving 50 to 60 feet to pass through a spillway, Pinney says. The TSW at Little Goose, on the Snake River, is about 35 feet tall and 50 feet wide. Advanced American Construction of Portland, Ore., manufactured and installed the TSW. This weir was installed in February 2009, to be tested during the spring 2009 fish passage season.

Preliminary results include survival and passage probabilities from juvenile salmonids passing Little Goose Dam during the spring of 2009. The first study sampled fish equipped with HI-Z Turb’N Tags supplied by Normandeau Associates. The HI-Z tag provides direct survival estimates of spillbay configuration passage. The second study sampled fish equipped with radio tags implanted by U.S. Geological Survey (USGS) personnel. In addition to estimating survival probabilities by a single route (such as the TSW), the Corps requested estimates of fish passage efficiency (the probability of passing via non-turbine routes); fish guidance efficiency (the probability of being diverted into the juvenile bypass system during powerhouse passage); and effectiveness of the spillway, spillway weir, and both routes combined using fish implanted with radio tags and passive integrated transponder (PIT) tags.

A temporary spillway weir like this one installed at 810-MW Little Goose provides high probabilities of juvenile salmon and steelhead spill passage survival and high spill passage effectiveness.

Normandeau studied the survival and condition of chinook salmon in passage through Spillbay 1 at two different discharge levels and through Spillbay 8 at a single discharge. New flow deflectors were installed in both spillbays, and Spillbay 1 was equipped with the TSW in March 2009. The TSW was equipped with either a low or high crest weir to accommodate spring and summer flows. Fish were released so their projected path was deep within the TSW discharge jet and mid-level and deep within the discharge jet from Spillbay 8. Results indicated that direct survival of fish passed deep through both the high and low crest TSW weirs in Spillbay 1 were significantly less than the survival of deep or mid-passed fish through Spillbay 8. Although the 48-hour survival was greater through Spillbay 8, fish passing through this spillbay had a higher chance of injuries. The low crest TSW with its higher discharge inflicted the fewest and least severe injuries.

Preliminary results from the USGS indicate that while the TSW was operating, greater than 95 percent of all radio-tagged hatchery yearling chinook salmon, juvenile steelhead, and subyearling chinook salmon passed Little Goose Dam through routes other than the turbine (fish passage efficiency). The TSW with entrainment spill contributed to more than 70 percent of the passage probabilities for chinook salmon and more than 55 percent for steelhead. The TSW alone contributed around a 5:1 ratio of fish to water spilled for chinook salmon and more than a 4:1 ratio for steelhead (spill passage effectiveness). TSW passage survival probabilities for the sample fish were estimated at nearly 100 percent for yearling chinook and steelhead and only a couple of percentage points lower for subyearling chinook salmon. The addition of entrainment spill only reduced the survival probabilities by less than a percentage point.

With the installation of the Little Goose TSW, all four Corps dams on the lower Snake River have surface fish passage facilities. These dams are 603-MW Ice Harbor, Little Goose, 810-MW Lower Granite, and 810-MW Lower Monumental.

AXYS Technologies receives ISO 9001:2008 certification

AXYS Technologies Inc. in Sidney, British Columbia, Canada, received 9001:2008 certification from the International Organization for Standardization (ISO).

ISO 9001 is a global benchmark for quality management systems. The standard is used as a framework for providing assurance about the supplier’s ability to satisfy quality requirements. ISO 9001 certification often is a market requirement for suppliers to participate in supply chains or bid for procurement contracts.

ISO 9001:2008 replaced ISO 9001:2000 in 2008. ISO 9001:2000 replaced the 1994 version, ISO 9001:1994. AXYS originally acquired ISO 9001:1994 accreditation, then upgraded to ISO 9001:2000.

In March 2010, AXYS was certified as meeting the ISO 9001:2008 requirements, which include developing a set of procedures that cover all key processes in the business, monitoring processes to ensure they are effective, keeping adequate records, checking output for defects and taking appropriate correction actions where necessary, regularly reviewing individual processes and the quality system for effectiveness, and facilitating continual improvement.

AXYS designs, manufactures, installs, and maintains remote environmental monitoring systems.

Alstom offers ALSPA Series 6 technology in North America

Alstom’s Energy Management Business is offering its Series 6 suite of power plant control and automation technology to the North American market, the company reported.

Designed for all types of and all parts of power plants, Series 6 provides all the necessary software applications, information technology control layers, equipment, and services that power providers and service operators require, the company reports.

To support deployment of Distributed Control System solutions across North America, Alstom has established a project and engineering center in Richmond, Va.

In February 2010, Alstom won a contract for automation of Eskom’s Kusile thermal plant using its ASPA Series 6 technology. Kusile is scheduled for completion in 2017. Eskom also is using the technology for its Medupi thermal plant, which is to be complete in 2015.

Alstom provides integrated power plant solutions and associated services for a variety of energy sources, including hydroelectric, nuclear, gas, coal, and wind.

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