Journal of Irrigation and Drainage Engineering: Recent submissions

Now showing items 2641-2660 of 3826

    • Optimal Design of Parabolic-Bottomed Triangle Canals 

      K. Babaeyan-Koopaei; E. M. Valentine; D. C. Swailes (American Society of Civil Engineers, 2000)
      The characteristics of a parabolic-bottomed triangle cross section are introduced. For this geometry the “best” hydraulic cross section is determined by using the undetermined multipliers method of Lagrange. For a given ...

    • Adjusting Temperature Parameters to Reflect Well-Watered Conditions 

      Terry A. Howell (American Society of Civil Engineers, 2000)

    • Model of Water Application under Pivot Sprinkler. I: Theoretical Grounds 

      Yves Le Gat; Bruno Molle (American Society of Civil Engineers, 2000)
      A model describing the application pattern produced by a single sprinkler is proposed. Based on calibrated statistical distributions and free from any ballistic consideration, this model uses a mixture of beta probability ...

    • Adjusted Average Correction Factors for Sprinkler Laterals 

      Arif A. Anwar (American Society of Civil Engineers, 2000)
      This paper is the fourth in a series on friction factors for sprinkler laterals. The widely used friction correction factor

    • Hydraulic Performance of Fish Bypass-Pools for Irrigation Diversion Channels 

      Athanasios N. Papanicolaou; Adam R. Maxwell (American Society of Civil Engineers, 2000)
      This paper presents the results of an exploratory study on the hydraulics of a fish bypass-pool that is built to facilitate successful fish passage through an irrigation diversion channel. The hydraulic performance of the ...

    • Discharge Characteristics of Skew Sluice Gates 

      Prabhata K. Swamee; Santosh K. Pathak; Talib Mansoor; Chandra Shekhar P. Ojha (American Society of Civil Engineers, 2000)
      Discharge characteristics for a skew sluice gate, ranging between the two extreme cases of a side sluice gate and a normal sluice gate, have been explored. The concept of an elementary discharge coefficient was utilized ...

    • Comprehensive Design of Minimum Cost IrrigationCanal Sections 

      Prabhata K. Swamee; Govinda C. Mishra; Bhagu R. Chahar (American Society of Civil Engineers, 2000)
      Design of a minimum cost canal section involves minimization of the sum of costs per unit length of the canal, subject to uniform flow condition in the canal. Essentially it is a problem of minimization of a nonlinear ...

    • Model of Water Application under Pivot Sprinkler. II: Calibration and Results 

      Bruno Molle; Yves Le Gat (American Society of Civil Engineers, 2000)
      A distributional semiempirical model for the simulation of spatial distribution of water application under center pivot sprinklers has been developed by the writers. This method describes the probability of water application ...

    • Water Distribution Management in Small West African Canal Systems 

      W. Ray Norman; M. Todd Walter; Michael F. Walter; Erin S. Brooks (American Society of Civil Engineers, 2000)
      The performance and progressive development of irrigation distribution and rotation methods were studied in two government-sponsored systems of Niger, West Africa. Systemwide water distribution was monitored intensively ...

    • Rate and Volume of Stream Depletion due to Pumping 

      Sushil K. Singh (American Society of Civil Engineers, 2000)
      The two analytical solutions researched by Theis, and also Glover and Balmer, for the rate of stream depletion are shown to be the same in the mathematical sense by solving the integral appearing in the Theis solution. ...

    • Soil Salinity Modeling over Shallow Water Tables. II: Application of LEACHC 

      R. Ali; R. L. Elliott; J. E. Ayars; E. W. Stevens (American Society of Civil Engineers, 2000)
      Root zone salinity is one of the major factors adversely affecting crop production. A saline shallow water table can contribute significantly to salinity increases in the root zone. A soil salinity model (LEACHC) was used ...

    • Time Series Modeling for Predicting Spatially Variable Infiltration 

      L. J. Schwankl; N. S. Raghuwanshi; W. W. Wallender (American Society of Civil Engineers, 2000)
      Furrow irrigation performance is affected by spatial variability of infiltration; thus, its characterization is essential for accurate performance evaluation. A time-series modeling approach was used to characterize the ...

    • Finite-Element Grid Configurations for Drains 

      K. C. Tarboton; W. W. Wallender (American Society of Civil Engineers, 2000)
      Several different finite-element grid configurations were evaluated for use in the numerical approximation of steady and transient flow to a single drain. By comparing the numerically simulated drain flow rates and head ...

    • Simulating Spatially Distributed Water and Salt Balances 

      L. Mateos; C. A. Young; W. W. Wallender; H. L. Carlson (American Society of Civil Engineers, 2000)
      Irrigation districts are made up of multiple units that are hydrologically connected. If the irrigation units are arranged in parallel, an improvement of the on-field irrigation consumptive use coefficient (ICUC) has more ...

    • Numerical Solution of 2D Free Surface Flow to Ditch Drains in Anisotropic Soils 

      Vinod Kumar; C. S. Jaiswal; H. S. Chauhan (American Society of Civil Engineers, 2000)
      A numerical solution of two-dimensional free surface flow to ditch drains in homogeneous and anisotropic soils is presented. The differential equation governing two dimensional ground-water flow in anisotropic soils is ...

    • Estimating Solar Radiation and Evapotranspiration Using Minimum Climatological Data 

      Zohrab Samani (American Society of Civil Engineers, 2000)
      A procedure is introduced to estimate solar radiation and subsequently reference crop evapotranspiration using minimum climatological data. The paper describes a modification to an original equation that uses maximum and ...

    • Benefits of Flexible Irrigation Water Supply 

      Paul R. Cross (American Society of Civil Engineers, 2000)
      This paper develops a general introduction into the concepts of a flexible irrigation water supply in rate, frequency, and duration together with the benefits to the farmer for doing so. A flexible water supply allows the ...

    • Irrigation District Service in the Western United States 

      C. M. Burt; S. W. Styles (American Society of Civil Engineers, 2000)
      Data were obtained from 61 agricultural districts within the Mid-Pacific Region of the U.S. Bureau of Reclamation, regarding the level of water delivery service provided to users, water pricing, associated characteristics, ...

    • Chebyshev Solution as Aid in Computing GVF by Standard Step Method 

      Subhasish Dey (American Society of Civil Engineers, 2000)
      The standard step method is commonly used to compute free surface profiles in gradually varied flow (GVF) through open channels. In this study, generalized numerical solutions in the Chebyshev form are presented for the ...

    • Estimation of FAO Blaney-Criddle <b><i>b</i></b><b> Factor by RBF Network</b> 

      Slavisa Trajkovic; Miomir Stankovic; Branimir Todorovic (American Society of Civil Engineers, 2000)
      This technical note presents the application of a Radial Basis Function (RBF) network to estimate the FAO Blaney-Criddle