Journal of Irrigation and Drainage Engineering: Recent submissions

Now showing items 3121-3140 of 3826

    • Modeling Subsurface Drainage and Surface Runoff with WEPP 

      M. R. Savabi (American Society of Civil Engineers, 1993)
      The U.S. Department of Agriculture's Water Erosion Prediction Project (WEPP) is a new technology based on fundamentals of hydrology, soil physics, plant science, hydraulics, and erosion mechanics. WEPP hydrology includes ...

    • Institutional Distortion of Drainage Modeling in Arkansas River Basin 

      Janne Hukkinen (American Society of Civil Engineers, 1993)
      Cognitive mapping based on interviews with Colorado's water‐management officials indicates that institutional factors inhibit the Soil Conservation Service (SCS) from beneficially applying the so‐called Interactive Accounting ...

    • Description and Evaluation of Program: Duflow 

      A. J. Clemmens; F. M. Holly, Jr.; W. Schuurmans (American Society of Civil Engineers, 1993)
      DUFLOW is a microcomputer software package for simulating one‐dimensional unsteady flow in open‐channel systems. The program is designed for simple networks of channels with simple structures. Water levels and flow rates ...

    • Reliability of Optimized Furrow‐Infiltration Parameters 

      E. Bautista; W. W. Wallender (American Society of Civil Engineers, 1993)
      The reliability of furrow‐infiltration parameters computed from advance measurements was analyzed. Lumped parameters were obtained using the least‐squares approach. The objective function was formulated using advance time ...

    • Furrow Irrigation Model for Real‐Time Applications on Cracking Soils 

      Jean‐Claude Mailhol; Juan‐Manuel Gonzalez (American Society of Civil Engineers, 1993)
      Clay soils frequently develop large cracks after irrigation. Infiltration equations therefore need to be modified to take cracking soil properties into account when modeling and optimizing furrow irrigation. In this article, ...

    • Description and Evaluation of Program Canal 

      G. P. Merkley; D. C. Rogers (American Society of Civil Engineers, 1993)
      CANAL is a computer model that was developed at Utah State University to perform unsteady‐flow simulations for branching canal networks. This paper describes the features of the model and discusses its strengths, weaknesses, ...

    • Description and Evaluation of Program Modis 

      Wytze Schuurmans (American Society of Civil Engineers, 1993)
      MODIS is an implicit hydrodynamic modeling package that computes the unsteady water flow in open canals. MODIS has been developed to investigate the hydraulic performance of dynamic controlled irrigation systems. The MODIS ...

    • Unsteady‐Flow Modeling of Irrigation Canals 

      Unknown author (American Society of Civil Engineers, 1993)
      Historically, the distribution of water in irrigation‐canal networks has been poor in many irrigation projects around the world. This has lead to poor use of the water supply. Unsteady‐flow mathematical models of ...

    • Cal Poly Model Canal 

      John B. Parrish, III; Charles M. Burt (American Society of Civil Engineers, 1993)
      The Cal Poly Model Canal, located at the Water Delivery Facility, Irrigation Training and Research Center, California Polytechnic State University, San Luis Obispo, Calif., was built to accommodate the study and promotion ...

    • Informed Use and Potential Pitfalls of Canal Models 

      Dinshaw N. Contractor; Wytze Schuurmans (American Society of Civil Engineers, 1993)
      Numerical models of unsteady flow in canals are used in the design, analysis, and operation of irrigation‐canal systems. Their informed use requires knowledge of the potential pitfalls and sources of error. There are three ...

    • Unique Problems in Modeling Irrigation Canals 

      Forrest M. Holly, Jr.; Gary P. Merkley (American Society of Civil Engineers, 1993)
      This is one of several introductory papers resulting from work by the ASCE Task Committee on Irrigation Canal System Hydraulic Modeling. It is intended to serve as background for analyses by the Task Committee of several ...

    • Numerical Methods Used to Model Unsteady Canal Flow 

      T. S. Strelkoff; H. T. Falvey (American Society of Civil Engineers, 1993)
      This paper presents a critical review of numerical methods used to model unsteady flow in canals. The significance of the various forms of the governing equations is outlined, and the problems associated with the evaluation ...

    • Irrigation‐Canal‐Simulation Model Usage 

      C. M. Burt; G. Gartrell (American Society of Civil Engineers, 1993)
      Unsteady canal‐simulation model usage requires serious investments of time and personnel. The reasons for deciding to invest in a model, as well as reasons not to invest, are discussed. For most cases, it is better to ...

    • Field Data For Verifying Canal Unsteady Flow Models 

      David C. Rogers; Timothy F. Kacerek; Robert S. Gooch (American Society of Civil Engineers, 1993)
      To help evaluate and compare canal unsteady flow models, field data were collected from two operating canal systems: the Central Arizona Project and the Salt River Project. These two large projects in Arizona convey ...

    • Description and Evaluation of Program USM 

      David C. Rogers; Gary P. Merkley (American Society of Civil Engineers, 1993)
      USM is a hydraulic‐simulation computer program developed by the U.S. Bureau of Reclamation to analyze unsteady‐flow conditions in canals. The program USM uses the method of characteristics to solve the complete Saint Venant ...

    • Description and Evaluation of Program: CARIMA 

      Forrest M. Holly, Jr.; John B. Parrish, III (American Society of Civil Engineers, 1993)
      This paper is one of a series resulting from the ASCE Task Committee on Irrigation Canal System Hydraulic Modeling, including presentation and evaluation of several programs, one of which is CARIMA. The CARIMA code simulates ...

    • Hydraulics of Center‐Pivot Laterals 

      Edmar J. Scaloppi; Richard G. Allen (American Society of Civil Engineers, 1993)
      Analytical equations that characterize hydraulics of center‐pivot laterals with and without end‐gun sprinklers were developed. The equations include computation of pressure‐head distribution; pressure‐head loss; and maximum, ...

    • Hydrogeologic Factors Affecting Mobility of Trace Inorganic Constituents 

      Kenneth D. Schmidt (American Society of Civil Engineers, 1993)
      The aquifers beneath irrigated lands in the southwestern United States are composed of alluvial deposits that, together with subsurface geologic conditions and water‐level elevations, largely determine the movement of ...

    • Changes in Entrance Resistance of Subsurface Drains 

      Walter J. Bentley; R. W. Skaggs (American Society of Civil Engineers, 1993)
      This study was conducted to examine the entrance resistance and head losses in the immediate vicinity of subsurface drains and to measure the change with time just after drain installation. Laboratory experiments were ...

    • Reduction of Deep Percolation and Drain Water 

      Richard A. Piper; Anthony J. Cappellucci (American Society of Civil Engineers, 1993)
      Principle considerations in examining water‐management options for the control of toxic trace elements in agricultural drainage waters are addressed, including a number of improvements in off‐farm water delivery systems, ...