Hydrau-Tech specializes in the design of dams and related structures in several countries. They have experience in various aspects of dam design for irrigation and hydropower, experience in social, economic, and environmental issues related to assessing the feasibility of dam design projects, and in capacity building.
Hydrau-tech provides services including:
- Design of dams, barrages, weirs, and hdropower structures
- Modeling of various aspects of dam hydraulics and sedimentation
- Physical and numerical modeling of hydraulic structures
- Water distribution system design
- Hydraulics of dam failures and changes in channel morphology due to dam failures
- Experimental and numerical modeling of scour and hydraulics at hydraulic structures
Design of Dams, Barrages and Weirs
Bisri Dam, Lebanon.
Responsible for planning, conceptual drawings, design criteria, designs, detailed drawings and specifications for all hydro-mechanical equipment including outlet hollow cone valves, top seal radial gates and fixed wheel emergency gates, intake trash racks.
Godavari Barrage, India
Responsible for designs, specifications, and procurement for automation and state-of-the-art telemetry equipment for the world’s longest barrage with 186 barrage gates 20 m x 15 m size on Godavari Barrage for flood control and irrigation.
Manganti Diversion Dam, Indonesia
For the existing Manganti diversion dam, investigated the problems of heavy leakage and severe vibrations of spillway radial gates. Developed designs for modifications to the sealing design and bottom shape of the gates which successfully eliminated the vibrations and leakage problems.
Penjengkolan Irrigation Diversion Weir, Indonesia
Design responsibility for canal headworks gates. Designed the installation, specified the gate equipment, approved manufacturer’s drawings, and conducted the factory and field inspections.
Pranburi Dam, Thailand
Responsible for detailed designs, drawings and specifications for radial type spillway gates with electric rope drawn hoists for Royal Irrigation Department in Thailand.
Recreta Dam Project, Peru
Hydraulics/ hydro-mechanical design for Recreta Dam and Irrigation Project. Prepared hydraulic designs, drawings, technical specifications, and cost estimates for the irrigation outlets and intakes including gates and appurtenances.
Valenciano Dam, Puerto Rico
Design of the Valenciano Dam in Puerto Rico in cooperation with CSA Group. Hydraulic design of the Valenciano Dam, its spillway, and all appurtenances and the SCADA system for four crest gates each about 47′ wide x 17′ high. Valenciano is a 100-foot high roller compacted concrete (RCC) water supply dam with a converging spillway and converging stilling basin design. We designed the converging spillway and converging stilling basin (unique feature), the spillway profiles, the stilling basin, the downstream channel training wall heights as well as conducting hydraulic laboratory testing of the dam. Conducted reservoir sedimentation studies for service life computations as well as developing sediment mitigation measures including structural and operational measures.
Sanmen Xia Dam Reservoir, Yellow River China
In this World Bank funded study, worked with Chinese engineers from the Yellow River Commission to model reservoir sedimentation taking place in Sanmen Xia Dam. Sanmen Xia Reservoir is located in the lower part of the Middle Yellow River in China. It is a multi-purpose hydro-project mainly used for flood control. The drainage area above the dam amounts to 688,000 km2. The Yellow River cuts through an extensive loess plateau where a large portion of it suffers from severe soil erosion. The channel flows carry up to 60 percent solids by weight consisting of mainly fine sands and silts. Due to the large quantities of sediment carried by the Yellow River, Sanmen Xia Reservoir was filled within several years after its completion. In this World Bank project, numerical modeling of a 150 km segment of the Yellow River upstream from the Sanmen Xia Reservoir was accomplished by using the GSTARS model developed for the US Bureau of Reclamation by Dr. A. Molinas, Hydrau-Tech, Inc. The GSTARS model for the Yellow River has been successfully used to simulate the typical reservoir operations; reservoir operation rules were refined to optimally pass the incoming sediments with minimal retention in the reservoir.
Lock and Dam No. 26 (Replacement) Project, Saint Louis, Missouri, USA
Lock and Dam No. 26 is located on the Mississippi River near Saint Louis, Missouri. Due to increased demand on the aging system, the U.S. Army Corps of Engineers has replaced the old lock and dam with a new structure. The construction of the new Lock and Dam No. 26 was accomplished in 3 phases. In Phase 1, a cofferdam was built on the right bank of the Mississippi River that constricted the flows by 52 percent. In Phase 2, part of this cofferdam was removed, and with new additions, it was moved to the middle of Mississippi River resulting in 44 percent constriction. During the Phase 1 construction, due to severe contraction the river segment along the cofferdam scoured up to 35 feet. Of this amount, 15 feet of it occurred in a single flooding event that was estimated as the 10-year flood. In order to assess the additional scour that could occur during the rest of the Phase 1 and during the Phase 2 construction, a numerical modeling study was conducted. The GSTARS (Generalized Streamtube Model for Alluvial River Simulation) model developed by Dr. Molinas, President, Hydrau-Tech, Inc. was applied to study scouring patterns around the new Lock & Dam 26 site. The GSTARS model divides the flow channel into conceptual stream tubes. Hydraulic conditions and sediment transport is computed along each tube separately. During Phase 1, maximum velocities and consequently maximum scour occurred at the nose region of the cofferdam. GSTARS simulated the scour at the nose region and along the cofferdam very closely. Following the verification runs, potential for additional scour for Phase 1 and Phase 2 cofferdam configurations were investigated. It was determined that additional scour was expected and structural and pumping requirement changes were made to reflect computations.
Rock Creek and Cresta Dam Sedimentation and Design of Mitigation Structures, California, USA
Rock Creek and Cresta dams are two of the concrete gravity dams owned and operated by Pacific Gas and Electric Company along the North Fork Feather River, California. Since their construction in 1950, sediments have accumulated in the Rock Creek and Cresta reservoirs resulting in potentially reduced reliability of dam and powerhouse operations. In order to mitigate the sedimentation problems within the environmental concerns, the structural modification initially proposed for Rock Creek dam consisted of constructing a 30 ft wide by 30 ft high top-sealing radial gate through the right abutment. For Cresta dam, two new 10 ft diameter outlet pipes were proposed through the dam. A laboratory model study to test effectiveness of the proposed modifications was conducted by Dr. Albert Molinas. Scaled down models of the dams were placed in undistorted moveable-bed river models. Using series of experiments using lightweight plastic pellets and very fine sand to simulate reservoir sediments, the location of the proposed structures, their dimensions, and operational efficiencies were optimized. The vertical positioning of both the sediment pass through pipes at the Cresta Dam and the 30 ft by 30 ft rectangular radial gate in the Rock Creek Dam were crucial to the sediment passing efficiencies of these structures. For the Rock Creek Dam, water discharged through the submerged sediment pass-through spillway posed an additional challenge by creating a recirculation zone immediately downstream from the dam. This adverse effect was resolved by experimentally adjusting the discharge distribution between the pass-through and main spillway gates, and by developing spillway operation rules.
Bachman Dam Renovation Project, Texas, USA
Bachman Dam was built in Dallas, Texas, around the turn of the century. The dam has a converging spillway that has deteriorated through time. Recent flooding events demonstrated that the safety of the spillway and consequently the dam is at danger. In this study, Hydrau-Tech, Inc. assisted Kellogg, Brown and Root (KBR, formerly Halliburton) in conducting hydraulic and hydrologic computations, PMF computations, verifying compliance with FERC, FEMA, and Texas Environmental Water Quality regulations, as well as assisting in selecting appropriate dam and spillway design options.
Sedimentation Study at St. Charles Casino Cofferdam, Missouri River, Saint Louis, USA
St. Charles Station Casino is located on Missouri River near Saint Louis, Missouri at approximately 5 miles upstream from its confluence with the Mississippi River. Riverboats and barges forming the casino structures (flotilla) are located in the wake region of a temporary cofferdam structure, immediately downstream from the Missouri State Highway 70 Bridge. This 400 ft wide by 800 ft long cofferdam contains extensive resort facilities that are being constructed. Due to excessive sediment accumulation behind the cofferdam, according to governing laws, the SCSC faces closure if the flotilla loses its floating status. In order to avoid the high sediment inflow into the flotilla region, a structural solution is proposed to build an 800 ft long sheet-piling diversion wall to enclose the flotilla. It is hoped that this wall would deflect the oncoming sediments away from the casino area and avoid sediment built-up. The effectiveness and the feasibility of the proposed diversion wall and the identification of stagnation flow regions to improve efficiency of the design were determined by using a state-of-the-art finite element surface flow model (FEM) developed by Hydrau-Tech (Molinas and Hafez, 2000).
Carraizo Dam, Puerto Rico, USA
Designed gates and the SCADA system for eight radial gates, each about 41′ wide and 36′ high, and prepared recommendations for the rehabilitation of the gates. Carraizo is a 100-foot high concrete gravity dam which overtopped during Hurricane Hugo in 1989. The overflow designs developed for the dam eliminated the need for bascule gates on the tainter gates and saved significant costs.
Design of Hydropower Systems
Alfalfal Hydroelectric Project, Chile (1986-87)
Responsible for planning, selection, designs and drawings, procurement specifications for international bidding, and cost estimates for hydromechanical equipment including spillway gates, flushing sluice gates, gravel excluder gates, automatic desander system, power tunnel intake gates, draft tube gates, trash racks and screens, and all operating equipment and control systems. Most of the systems were designed for remote control operation as well as automatic mode operations. The power plant is an underground type. Also designed hydraulic oil operated control systems, stoplogs, bulk heads, monorail hoists, gantry cranes, and trashracks for the above equipment.
Sardar Sarovar Irrigation and Hydroelectric Project, India
World Bank consultant for the mighty Sardar Sarovar Project including large spillway radial gates 60-feet-wide and 56.7 feet-high, large number of canal gates, and automation for the longest canal system in the world with 40,000 cubic feet per second capacity. Coordinated design and canal automation for over 400 tainter gates on the largest canal system in the world. Responsible for planning, selection, hydraulic, structural as well as mechanical designs of gates and operating equipment and all ancillaries required to ensure successful automation for the world’s largest canal automation project.
Kadambarai Pump Storage Project, India (1988)
As UNDP Consultant, advised Chennai State Electricity Board on the hydromechanical equipment operation and problem solving for the 600 MW, 300 meter head underground pump-storage project.
Alto Yaque Bao Hydroelectric Project, Ecuador
Performed detailed waterhammer analysis, sizing of penstocks and surge shafts, and sizing of powerplant units for three underground powerplants of 145 MW capacity, 1,540-foot head. The power tunnel system included a 6.75-mile power tunnel and a 7.5-mile trans-basin pressure tunnel and Pelton turbines.
Batutegi Dam and Hydropower Plant, Indonesia
For Nippon Koei performed designs, specifications, drawings, tender documents, tender analysis, review of shop drawings and contractor’s submittals for all hydromechanical equipment including turbines, governors, penstocks, gates, and valves, penstocks including bifurcations for 70 m head hydropower plant and irrigation outlet works. Coordinated hydraulic model tests for the penstocks, bifurcations and Butterfly and Fixed cone valves at the University of Graz in Austria and design coordination with Noell in Germany. Responsible for the designs and drawings for 3.0 meter diameter penstocks, steel liners, bifurcations under maximum head of 140 meters. Proved by model studies that Biplane or flow through butterfly valves can be used in high velocity outlets, which was accepted by Noell,Germany and used successfully first time in the world..
Jiguey Hydroelectric Project, Dominican Republic
Principal mechanical engineer for investigating and preparation of initial reservoir filling and testing for gates, penstocks and power tunnels.
Mattengang Pump Storage Project, Indonesia
Responsible for planning, selection and costing of hydromechanical equipment for 500 MW and 1,000 MW pump turbines, spherical valves, penstocks, bifurcations, crane and other auxiliary equipment for 1,600-foot head pumped storage project.
Mayush Hydroelectric Project, Peru
Responsible for planning, selection, designs, drawings, and procurement specifications for international bidding, cost estimates, and contract documents for various types of hydromechanical equipment for the project, including automation of spillway gates, de-sanders, flushing sluice gates, gravel excluder gates, and gates for power waterways and tunnels and trash screens.
Magat Hydroelectric Project, Philippines
Responsible for checking manufacturer’s designs and drawings for large 52-foot-wide by 65-foot-high spillway radial gates, hoists and pre-stressed anchorages for Magat Dam of National Irrigation Administration in the Philippines.
Nan River Hydroelectric Project, Thailand.
Conducted detailed checking and approval/ coordination with contractors and site office, and all detailed designs and drawings for:
- Spillway Radial Gates
- Fixed Wheel Intake and surge tank Gates
- High Pressure Outlet Gates
- Intake Stoplogs, Trashracks, Gate Shaft Elevator
Pantabangan Hydropower Plant, Philippines
Responsible for turbines, penstocks, intake trash racks turbine governors, inlet valves, E.O.T cranes, draft tube gates for the power plant and shop assembly and shop tests at Mitsubishi in Japan. Designed 6.0 meter diameter steel liners, penstocks and bifurcations under a maximum head of 450 feet including waterhammer.
Upper Pampanga Irrigation and Hydroelectric Project, Philippines
Responsible for designs, drawings, and hydraulic model tests for all gates (including high head, bonnetted slide and fixed wheel), hoists and controls as well as penstocks, and intake trash racks Prepared detailed operation and maintenance manual and procedures. Directed hydraulic model studies for the high-head penstock and outlet gates in Ishikawajima Harima Heavy Industries (IHI) laboratories in Yokohama, Japan. Designed 6-meter-diameter penstocks and bifurcations under a head 140 meters.
Project Management for licensing and design of 4 MW run-of-river hydroelectric project in Kauai, Hawaii, USA
Project included economic studies and optimization of project size and location, optimization of penstock size and material, optimization of turbine/generators, and development of construction plans and specifications. We secured required federal, state and local permits.
Sacramento Municipal Utility District in The Geysers, California, USA
Project Management for licensing, design, expediting and inspection, and construction management of 73 MW geothermal powerstation.
Marble Valley Pump Storage Hydroelectric Project of Virginia Electric and Power, USA
Conducted hydraulic computations for the evaluation of operations and reservoir circulation.
Cabin Creek Hydroelectric Pumped Storage Project for Public Service Company of Colorado, USA
Designed the upper reservoir intake for the project.