Water Duty for Agriculture in the Western United States
The agricultural water duty is a measure of the quantity of water reasonably required for use in agricultural crop production. For some time in the western United States, the agricultural...
Interbasin Transfers of Water in Ogallala States
Water rights to enable a major interbasin transfer can be obtained either through an initial appropriation or by acquiring an existing water right. All unappropriated surface water in...
Proposal for Funding Water Conservation Programs
Programs have been identified which appear to have the potential to conserve significant amounts of water within a large irrigated agricultural area. Losses such as canal seepage, operational...
Optimization of Irrigation Distribution System Operation
The initial phases of the Federal Central Arizona Project (CAP) are nearing completion and in the latter part of this year the long-awaited delivery of Colorado River water will become...
Effect of Subsurface Drainage in the Lower Mississippi Valley on Surface Water Quality
Sediment and nutrient losses were measured from a subsurface drainage-runoff-erosion experiment for the years 1981 to 1984. The experiment, located near Baton Rouge, Louisiana, consisted...
Effect of Agricultural Drainage on Surface Water Quality in Delaware
Parts of Kent and Sussex counties, Delaware, require drainage to have productive agricultural soils. Drainage has been installed on the Delmarva Peninsula since colonial days. Drainage...
Trends in Irrigation Water Use?Texas Rice Belt
In the Rice Belt along the Texas Gulf Coast, where stress on water resources is increasing, federal, state, and local specialists are conducting a 5-year examination of irrigation. Measured...
Yield-ET Functions in Irrigation Systems Design
A linear-programming (LP) framework and associated computer routines were developed to evaluate economics of deficit irrigation in system design and to optimize the sizing and operation...
Hydrologic Impacts of Improved Irrigation Efficiencies
The Salt River drainage basin (Star Valley) is an agricultural watershed of 829 mi**2 (2150 km**2) in western Wyoming. Salt River stream flows were hydrologically analyzed and a comparison...
Progress in Controlling Subsidence in the Houston Area
The withdrawal of large quantities of groundwater in Harris and Galveston counties of Texas has resulted in a critical subsidence problem, especially in the low lying areas along the coast....
Effects of Saline Water Tables on Corn Irrigation
Hydraulic, weighing lysimeters were used for three years to measure the effect of high, saline water tables on irrigation requirement of corn. For each of the years corn was grown with...
Picture Index for Field Verification of Crop Coefficients
A picture index has been developed for eight irrigation crops to obtain reliable, rapid, and low-cost field determinations of crop growth stages and corresponding crop coefficient (Kc)...
Irrigation Water Requirements Under Wide-Spaced Furrow Irrigation
Research has shown that wide-spaced furrow irrigation (WSFI) can produce acceptable yields of crops with less water than every-furrow irrigation (EFI). In many seasons WSFI will result...
Water Losses from an Irrigation Canal-Ditch-Dugout System
The general limitations of and requirements for accurate determination of water losses from an irrigation distribution system have been identified. A hydrologic water balance technique...
Channels and Groundwater: The Hydraulic Connection
Hydraulic connection between surface and groundwater implies that surface water can seep into the ground (transmission losses from open channels, for example) and eventually become or...
Scheduling in Manually Controlled Canal Irrigation Delivery Systems
The effects of canal transients on scheduling water delivery to an irrigated area are described using a linearized form of flow equation obtained from a zero-inertia momentum equation...
Daily Weather Forecasts Used to Manage Soil-Water
This paper describes a newly developed method for analyzing the rainfall probability data included in daily weather forecasts issued by the National Weather Service. The purpose is to...
The Edwards Aquifer in the San Antonio Area
The Edwards Aquifer in the San Antonio area is a highly productive groundwater system consisting of the Edwards Plateau water table aquifer and the Edwards Balcones fault zone artesian...
Nonlinear Deformation and Bispectral Change of Random Gravity Waves on Sloping Bed
A WKB-perturbation method is applied to the deformation of random gravity waves in water of slowly varying depth. In the present analysis, a spectral representation of WKB-type is assumed...
Encoder for Flood and Irrigation Data Transmission
This paper covers the design and use of a new dual parameter encoder for real time telemetry in the fields of flood forecasting and irrigation. Some history and background is presented...
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