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Frazil Ice Problems and Solutions at Hydro-Power Intakes
Active and passive frazil ice effects on hydroelectric plant intake design and operation are described and references are provided. The most frequently encountered problems and the basic...

Modernization of the Schoolfield Dam Hydroelectric Powerhouse
This case study describes the retrofitting of a turn-of-the-century powerhouse with modern turbine/generator equipment. The structure consists of numerous turbine bays separated by massive...

Rehabilitation of Dams, Spillways, and Hydroplants
Many older dams are in need of rehabilitation as a result of aging, deterioration, and more stringent safety standards. Concerns include deterioration of original construction materials,...

Dewatering Using a Floating Bulkhead Proves Flexible, Reusable and Cost Effective
Going beyond a traditional bulkhead dropped in place with a barge crane or crane hoist, a steel floating bulkhead was conceived to dewater powerplant intakes, gated spillway bays or outlet...

Dardanelle Turbines
The Dardanelle turbines located at river mile 205.5 of the McClellan-Kerr Arkansas River Navigation System, are experiencing an unusual amount of wear in the blade trunnion bushings. Oil...

Dillon Hydroelectric Project Performance Versus Expectations
The Dillon Hydroelectric Project was commissioned in 1987. Design and construction are briefly described; plant availability is compared with design expectations; and maintenance costs...

Fish Bypass System Mathematical Models
Mathematical models for fish diversion systems based on fish behavior in conjunction with diversion system structural and hydraulic properties are developed. Guidance efficiency is described...

Rocky Mountain Pump-Turbines and Related Mechanical Equipment
The Rocky Mountain powerplant will have three reversible, single stage, vertical shaft pump-turbine units, each having a maximum output of 321 MW generating and a maximum pumping capacity...

Decision Support for Colorado River Operations
The United States Bureau of Reclamation (Reclamation) uses a simulation model known as the 24-month Study Model for planning monthly and seasonal operations for the Colorado River Basin....

Turbines and Pump Turbines for Ultra High Heads
The paper describes the turbine development in Norway as background for high head turbine technology and shows a typical Norwegian high head Francis as an example. High head reversible...

Automated Lysimeter for Irrigation and Drainage Control
Knowledge of crop evapotranspiration (ET_c), the combined process of evaporation and plant transpiration, is important in agriculture for scheduling...

Use of Lysimetric Measurements for Designing Major Irrigation Systems in the USSR
The bioclimatic method for calculation of crop water requirements has been widely used in the USSR in recent years. The author has analyzed the results of its application for designing...

Lysimetric Monitoring for Operation of Irrigation Systems in the USSR
The author suggests a new method for operational control of irrigation regimes which is based on monitoring of a number of critical parameters related to the yield potentials of crops....

Prefabricated Weighing Lysimeter for Remote Research Stations
After designing and constructing several precision scale system weighing lysimeters in Southern Europe and the Middle East, the need arose for a prefabricated 'turn-key'...

Farm Irrigation Rating Index (FIRI)?A Procedure to Evaluate Both Irrigation Systems and Management
The Soil Conservation Service USDA/SCS, concentrates it's technical assistance to cooperators on improvements of on-farm irrigation systems and improvements of water management...

Operation of Irrigation System and Water Management in Low Lying Paddy Area with Creek Network
Characteristics of the operation and management of irrigation systems were analyzed in the low lying paddy area with creek networks. The irrigation system in Kubota district was chosen...

Effect of Frequency on Center Pivot Irrigation
Processes that are affected by the irrigation frequency of center pivot irrigation systems are described. High frequency irrigation will increase evaporation from crop canopies and unshaded...

Multi-Purpose Subsurface Drainage System for the Town of Saguache
The town of Saguache, Colorado had a high water table during the irrigation season that caused numerous problems within the town and resulted in high infiltration rates to the sewer system...

Agricultural Drainage Reuse in Agroforestry Systems
On the westside of California's San Joaquin Valley, agroforestry systems are being evaluated as a solution to the agricultural drainage problem. Eucalyptus tree plantations...

Flexible Irrigation Supply Pilot Projects?Part I: Principles
The principles are described (Part I) and illustrated with developing countries case studies (Part II) to present the techniques that economically permit the use of farmer controlled variable...

 

 

 

 

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