dams

A Cost Effective and Environmentally Sustainable Approach To Retrofitting Existing Dams for Hydroelectric Power Generation

Source: 
Waterpower XVI
Year: 
2009
Abstract: 

Hydraulic potential stored in water reservoirs can be converted to useful power through the work of turbomachinery. However, nations around the world have large numbers of existing dams with hydropower potential left unused. These dams were mostly built during the latter half of the 20th century. At that time, thermal electric energy supply, generated with abundant cheap fossil fuels made small scale hydropower generation less attractive. Another reason for such low utilization of these clean renewable energy resources is the significant capital cost of equipment and hydropower plant construction. This made small hydropower development economically noncompetitive. With the rapid depletion of fossil fuel and the increased environmental and global warming concerns, it becomes highly desirable to harness clean renewable energy sources.To retrofit a conventional hydroturbine onto an existing dam brings out several major issues. They include structural integrity and safety of the dam, and the cost of construction and complex engineering tasks involved in properly integrating a powerhouse into the existing structure. These issues have seriously impeded the progress in developing these hydroelectric potentials. In addition, available data indicates that existing hydroturbine technology has some undesirable ecological impacts by causing injury and mortality to passing fish and deterioration of downstream environmental condition resulting from undesirable levels of dissolved gas.In this paper the authors will first briefly summarize current hydropower development needs and challenges, and then describe a new approach to effectively meeting these challenges by using an innovative hydroturbine system. The new hydroturbine system consists of four key design innovations: 1) an updraft flow arrangement, 2) a vertical pressure-balanced turbine flow control valve in place of the conventional wicket gates, 3) a divergent runner flow chamber serving the function of the draft tube, and 4) exit flow at the free surface in the tailwater terrace.

Author(s): 

David T. Kao, Ting Zhong, James R. Mahar

Contact: 
Notes: 
Category: 

Inventory and Assessment of USDA/SWCD Watershed Dams

Year: 
2007
Abstract: 

The Georgia State Soil and Water Conservation Commission (Commission), in partnership with the Natural Resource Conservation Service (NRCS) and the Georgia Environmental Protect Division (EPD), has begun to evaluate the flood control dams, designed and constructed under federal laws PL 544 and PL 566, to determine which structures can be modified to serve as water supply reservoirs.The results of the analyses presented herein are based upon United States Geological Survey (USGS) quadrangle maps and, therefore, should be utilized for planning purposes only. If any of the subject projects are identified as having a possibility of progressing past this analysis, additional studies will be required. These studies will include but not be limited to detailed environmental evaluations, detailed yield analyses, preliminary engineering design, and detailed cost estimating. These additional studies will be required prior to beginning detailed design work and/or land acquisition. The level of study presented herein shall be considered as a screening tool to evaluate the one project strengths and weaknesses relative to other projects. Until further studies are performed, actual yield and environmental factors associated with each project can not be readily determined.

Author(s): 

Schnabel Engineering South, LLC

Contact: 
Notes: 
Category: 

Inventory and Assessment of USDA/SWCD Watershed Dams

Year: 
2007
Abstract: 

This report evaluates the flood control dams, designed and constructed under federal laws PL 544 and PL 566, to determine which structures can be modified to serve as watersupply reservoirs, i.e. conversion of ag dams to water supply dams.

Author(s): 

Schnabel Engineering South, LLC

Contact: 
Notes: 
Category: 

Pages