Journal of Irrigation and Drainage Engineering: Recent submissions

Now showing items 3521-3540 of 3826

    • Hale Cycle and Indian Drought and Flood Area Indexes 

      A. Ramachandra Rao; G‐H. Yu (American Society of Civil Engineers, 1989)
      The Indian drought and flood area indexes (DAI and FAI, respectively) have been suggested to be related to the Hale cycle of sunspot numbers by Bhalme and Mooley (1981). They studied the dependence between sunspot numbers, ...

    • New Drain Flow Formula 

      J. C. Miles; K. Kitmitto (American Society of Civil Engineers, 1989)
      A new drain flow formula is presented, and its accuracy is compared with Hooghoudt's formula and “correct” results obtained from a potential theory simulation. It is shown that the formula is suitable for representing flow ...

    • Irrigation and Drainage Strategies in Salinity‐Affected Regions 

      Timothy K. Gates; Mark E. Grismer (American Society of Civil Engineers, 1989)
      A simulation model is developed which accounts for the major processes governing shallow saline water table behavior in salinity‐affected irrigated regions. Designed for feasibility stage project planning, the model may ...

    • Direct Land Grading Design of Irrigation Plane Surfaces 

      Said M. Easa (American Society of Civil Engineers, 1989)
      Existing land grading design methods involve trial and error procedures to determine the plane that balances cut and fill volumes, considering the shrinkage of soil, to minimize earthwork. This paper presents simple formulas ...

    • Modeling Yields from Rainfall and Supplemental Irrigation 

      George H. Hargreaves; Zohrab A. Samani; Edgar Zuniga (American Society of Civil Engineers, 1989)
      Frequently, the area of good soils suitable for irrigation far exceeds that for which adequate water is available for maximum crop production. Decisions and/or policies are often required relative to how much land should ...

    • Roughness Values for Overland Flow in Subcatchments 

      S. Y. Liong; S. Selvalingam; D. K. Brady (American Society of Civil Engineers, 1989)
      A simple method is presented for assigning Manning roughness coefficients

    • Control of Irrigation Canal Networks 

      A. J. Clemmens; J. A. Replogle (American Society of Civil Engineers, 1989)
      Control schemes which are available for the operation of canal networks for irrigation projects are examined. These control schemes include upstream control, downstream control, controlled volume control, dynamic regulation, ...

    • Prediction of Class A Pan Evaporation in Southwest Idaho 

      Clayton L. Hanson (American Society of Civil Engineers, 1989)
      Class A pan evaporation from three sites on the Reynolds Creek Experimental Watershed in southwest Idaho showed that a single equation that incorporated solar radiation and mean temperature could be used to estimate daily ...

    • Irrigation‐Induced Contamination: How Real a Problem? 

      Jonathan P. Deason (American Society of Civil Engineers, 1989)
      The U.S. Department of the Interior has embarked on a series of reconnaissance‐level investigations throughout the western states to identify, evaluate, and respond to irrigation‐induced water quality problems. A series ...

    • Optimization Models for Wastewater Reuse in Irrigation 

      Abbas Afshar; Miguel A. Mariño (American Society of Civil Engineers, 1989)
      Mathematical models are formulated to develop management guidelines for an integrated wastewater reuse plan involving the use of reclaimed wastewater to irrigate summer crops. A linear‐programming allocation model is used ...

    • Equations Describing Sprinkler Droplet Velocity 

      K. P. Thooyamani; D. I. Norum (American Society of Civil Engineers, 1989)
      Previous investigators have used a graphical method to analyze rate of fall of water droplets through still air to show that the drag force of a water droplet is proportional to the second power of the speed. In this paper, ...

    • Analytical Model of Level Basin Irrigation 

      Gerd H. Schmitz; Günther J. Seus (American Society of Civil Engineers, 1989)
      A zero‐inertia model is presented to study surface irrigation. The model is based on an analytical solution of the slightly modified zero‐inertia differential equations for level borders and does not contain any restrictions ...

    • Effects of Deficit Irrigation and Irrigation Frequency on Wheat Yields 

      Marshall English; Brian Nakamura (American Society of Civil Engineers, 1989)
      The relationship between wheat yields and irrigation frequency was studied in a set of field experiments. Experimental plots were irrigated at intervals that ranged from two days to four weeks. The amounts of water applied ...

    • Evaluation of Irrigation Planning Decisions 

      Derrel L. Martin; James R. Gilley; Raymond J. Supalla (American Society of Civil Engineers, 1989)
      A method is developed to determine optimal irrigation strategies for a single season using crop production functions which incorporate physically based coefficients. The relationship of yield to evapotranspiration is used ...

    • Regulation of Agricultural Drainage to San Joaquin River 

      Gerald E. Johns; Dale A. Watkins (American Society of Civil Engineers, 1989)
      A technical committee made up of staff from the California State Water Resources Control Board (State Board) and the California Regional Water Quality Control Board, Central Valley Region (Regional Board) has investigated ...

    • Economics of Selenium Removal from Drainage Water 

      Rodney C. Squires; G. Raymond Groves; William R. Johnston (American Society of Civil Engineers, 1989)
      A treatment system consisting of biological reactors and microfiltration has been developed to remove soluble selenium species from agricultural drainage water. The process was evaluated over a two‐year period, and the ...

    • Selenium in Agricultural Drainage: Essential Nutrient or Toxic Threat? 

      Stephen B. Moore (American Society of Civil Engineers, 1989)
      The essential nutrient selenium is believed responsible for numerous deformities, reproductive failures, and deaths of migratory birds at Kesterson Reservoir in California's San Joaquin Valley. Wildlife problems at the ...

    • Erratum: “Characteristics of Square‐Edged and Round‐Nosed Broad‐Crested Weirs” by Amruthur S. Ramamurthy, Udoyara S. Tim, and M. V. J. Rao (February, 1988, Vol. 114, No. 1) 

      Unknown author (American Society of Civil Engineers, 1989)

    • Generalization of SCS Curve Number Method 

      Miklós Bosznay (American Society of Civil Engineers, 1989)
      Because of problems that arise in the use of the SCS curve number method of runoff estimation, the generalization thereof is suggested by returning to the original SCS model. For runoff volume estimations two alternative ...

    • Selenium in Arid and Semiarid Soils 

      R. G. Burau (American Society of Civil Engineers, 1989)
      Selenium is an essential element for many life forms but can cause toxicity when present at high levels in animal diets. The chemistry and particularly the geochemistry of selenium is similar to that of sulfur. Selenate, ...