Shallow Groundwater Collection for Reuse in Irrigation
A prototype system of subsurface drains for collection of shallow groundwater and reuse of drainage water for reuse in irrigation was examined. The system involved a field with subsurface...
Surface-Drained Level Basins for Rice Production
Surface-drained level-basin systems, consisting of a series of terraced level basins in which a portion of the applied water is drained from the inlet end of the basin, can be used to...
Research for New Water Table Management Systems
Water table management in the form of controlled-drainage and controlled-drainage/subirrigation is a feasible, yet under-utilized, practice in the Atlantic Coast flatwoods, the Ohio River...
Ground-Water Recharge from Streamflow Data, NW Florida
Annual base flows of streams draining Okaloosa County and adjacent areas in northwest Florida were determined through hydrograph separation and correlation techniques for purposes of evaluating...
The Effect of Channelization of R?o Puerto Nuevo on Ground-Water Levels in the San Juan Metropolitan Area, Puerto Rico
Channelization and concrete lining of the Rio Puerto Nuevo and its tributaries in the San Juan Metropolitan area has been proposed to control flooding in low lying areas adjacent to the...
Estimating Upland Recharge in the Yucca Mountain Area
Field and modeling studies were conducted recently for the Fortymile Canyon watershed and the Rock Valley area near the site of the proposed high-level nuclear waste repository at Yucca...
Modeling Tertiary Unit Performance in Large Irrigation Systems
Large irrigation systems constructed in the Asian region, deliver water over a wide area with varied agroclimatic conditions and cropping patterns. In order to evaluate the performance...
Flow Measurement in Irrigation Practice: State-of-the-Art
State-of-the-art flow metering developments for irrigation are reviewed. Selected older methods are updated with recent improvements. These include orifice meters, venturi meters, critical-flow...
A Decision Support Tool for Managing Main Canal Distribution Systems
Decision Support Systems are appearing with increased frequency in the domain of Water Resources Planning and Management. Efficiency and precision have become issues of primary importance...
A Decision Support System for Prediction of Crop Yield, Evapotranspiration, and Irrigation Management
Computer simulation models have been developed which predict growth, development, and yield for grain legumes. These models can be applied for yield prediction as well as water management...
An Analytical Technique of Flow Rate Into Perforated Draintubes
The flow rate into a draintube in a saturated soil media depends on numerous characteristics such as the hole size, the number and spacing of holes, the drain size and depth. Based on...
A Field Experiment to Evaluate the Water Quality Impacts of Agricultural Drainage and Production Practices
Many research projects are underway to address agricultural nonpoint source pollution of ground and surface waters. Many of these have the objective to develop and test models to predict...
Canal Models and You
Unsteady canal simulation models require serious investments of time and personnel. The reasons for deciding to invest in a model, as well as reasons to not invest, are discussed. Canal...
Numerical Methods Used to Model Unsteady Canal Flow
Investigating the response characteristics of irrigation waer supply and distribution systems is essential if a good design is to be developed. Numerical simulation techniques have been...
Source of Atrazine and Desethylatrazine in a River, During Base Flow
A budget of atrazine and desethylatrazine loads was computed for a 116-kilometer reach of the Cedar River in Iowa to determine where these compounds enter the river during base-flow conditions....
Water Quality of Shallow Groundwater Reused for Irrigation
Drainage water was collected by subsurface drains and reapplied to half of a drained alfalfa field in Fallon, Nevada, during the 1989 irrigation season. Irrigation district water was applied...
Hydrologic and Geochemical Approaches for Determining Ground-Water Flow Components
Lyman Lake is an irrigation-storage reservoir on the Little Colorado River near St. Johns, Arizona. The main sources of water for the lake are streamflow in the Little Colorado River and...
Interaction of Irrigation Water and Drainage Flow
This study was conducted to evaluate the effect of irrigation management on subsurface drainage flow in an arid irrigated area. The irrigation management and drainage flow were monitored...
Crop Simulation Modeling for On-Farm Irrigation Management
Crop models that estimate crop productivity in response to soil water offer potential for on-farm irrigation management. Useful models must produce accurate estimates of the soil water...
Crop Growth Models in Irrigation Management: Applications and Limitations
Crop growth models can provide helpful input to the complex process of on-farm irrigation decision making. The use of crop models in irrigation management will likely expand due to improved...
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