Journal of Irrigation and Drainage Engineering: Recent submissions
Now showing items 3701-3720 of 3826
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Closure to “<i>Estimation of Soil Erosion in India</i>” by Dhruva V. V. Narayana and Ram Babu (December, 1983)
(American Society of Civil Engineers, 1985) -
Roughness Coefficients for Routing Surface Runoff
(American Society of Civil Engineers, 1986)Hydraulic roughness coefficients have been derived from runoff plot data originally collected for erosion studies. The data were collected from different agricultural and natural surfaces by applying constant rainfall rates ... -
Dimensionless Formulation of Furrow Irrigation
(American Society of Civil Engineers, 1985)The equations governing the flow of water in irrigation furrows are put in nondimensional form by expressing each variable therein in ratio to an appropriate reference variable. Two systems of reference variables are ... -
Surface Irrigation Optimization Models
(American Society of Civil Engineers, 1986)This paper presents furrow and border irrigation design optimization models for corn. The models, which have nonlinear objective functions and constraints, are linearized to take advantage of existing linear programming ... -
Discharge Characteristics of Flow Past a Floor Slot
(American Society of Civil Engineers, 1986)For flow through a transverse rectangular slot located in an open channel floor, the slot width and the characteristics of flow in the approach channel are the important parameters that determine the slot discharge. To ... -
Discussion of “<i>Data Requirement for Evapotranspiration Estimation</i>” by Sun F. Shih (September, 1984)
(American Society of Civil Engineers, 1985) -
Plastic Lining on Riverton Unit, Wyoming
(American Society of Civil Engineers, 1985)Since 1975, the Bureau of Reclamation has installed approximately 25.8 miles (41.5 km) of PVC (polyvinyl‐chloride) lining in the distribution system of the Riverton Irrigation Project. The lining is part of a $40,000,000 ... -
Effect of Irigation Efficiencies on Nitrogen Leaching Losses
(American Society of Civil Engineers, 1985)The literature was reviewed to determine the effect increasing irrigation efficiencies have had on -
Characteristics of Free Surface Flow Over Gravel Bed
(American Society of Civil Engineers, 1985)Measurements of velocity profiles of a free surface flow over a permeable gravel bed indicate that the logarithmic velocity distribution can be preserved if the reference datum is located a small distance equal to about ... -
Automatic Throttle Hose—New Flow Regulator
(American Society of Civil Engineers, 1985)Flow regulators in both irrigation and storm water engineering normally must not be very exact, but should be simple to construct and maintain, “fool‐proof,” and of course inexpensive. A new flow regulator which matches ... -
Runoff Probability, Storm Depth, and Curve Numbers
(American Society of Civil Engineers, 1985)Using existing antecedent moisture condition (AMC) Curve Number relationships, a general expression of rainfall‐runoff is developed for AMC I and AMC III. The probability distribution of event runoff exceeding zero is found ... -
Overland Flow Hydrographs for SCS Type II Rainfall
(American Society of Civil Engineers, 1985)A mathematical model, which is founded on the kinematic‐wave and Green‐Ampt equations, is presented for the conjunctive overland flow‐infiltration process. Within the context of this model, it is shown that overland flow ... -
Least‐Cost Planning of Irrigation Systems
(American Society of Civil Engineers, 1985)A mixed‐integer programming model was used to obtain least‐cost system rehabilitation plans for a 6,900‐ha (17,000‐acre) irrigation project in southeastern Idaho. Three types of gravity conveyance system components (existing ... -
Irrigation Water Requirements for Senegal River Basin
(American Society of Civil Engineers, 1985)The Senegal River is a major natural resource in West Africa where the principal economic resources are agricultural. A proposed irrigation project will provide a significant increase in crop production and will exert a ... -
Procedure to Select an Optimum Irrigation Method
(American Society of Civil Engineers, 1985)A procedure to select an optimum irrigation method for specified field conditions is presented. The procedure is developed on the basis of indices that show the acceptability of the irrigation methods to the selection ... -
Evapotranspiration of Small Conifers
(American Society of Civil Engineers, 1985)Three lysimeters were established containing different sized Scotch pines -
Report of Task Committee on Water Quality Problems Resulting from Increasing Irrigation Efficiency
(American Society of Civil Engineers, 1985)The Task Committee on Water Quality Problems Resulting from Increasing Irrigation Efficiency coordinated preparation of a series of papers that addressed the perceived effects on water quality from increasing irrigation ... -
Efficient Water Use in Run‐of‐the‐River Irrigation
(American Society of Civil Engineers, 1985)Irrigation water demand, crop yield and water allocation models were developed and applied to a Philippine run‐of‐the‐river irrigation project. Dry season water supply hydrographs were classified into four levels of ... -
Drainage Required to Manage Salinity
(American Society of Civil Engineers, 1985)The amount of drainage required to prevent loss in crop productivity from excess soil salinity has been termed as the leaching requirement -
Salt Problems from Increased Irrigation Efficiency
(American Society of Civil Engineers, 1985)Increasing on‐farm irrigation efficiency reduces deep percolation and generally increases concentrations of soluble salts in the root zone. Since more salt precipitation occurs within the porous soil matrix, the mass of ...