Journal of Irrigation and Drainage Engineering: Recent submissions

Now showing items 2841-2860 of 3826

    • Modeling Flow and Transport in Drainage Areas with Shallow Ground Water 

      H. B. Manguerra; L. A. Garcia (American Society of Civil Engineers, 1997)
      A new modified linked approach is introduced to solve the governing partial differential equations for subsurface flow and salt transport by finite difference. It combines the attractive features of the standard linked and ...

    • Effect of Roots on Water Flow in Unsaturated Soils 

      Yoon-young Chang; M. Yavuz Corapcioglu (American Society of Civil Engineers, 1997)
      In recent years, beneficial effects of plants on the remediation of large volumes of slightly contaminated soils have been addressed by various researchers. Water is the main agent moving soluble contaminants in the soil ...

    • Discharge Measurement in Circular Sewer 

      Giuseppe Oliveto; Willi H. Hager (American Society of Civil Engineers, 1997)
      The Sector Venturi is a novel design to determine discharge in sewers. Its main features are simplicity, accuracy of ±5%, and low cost. Further, the modular limit is comparable to standard flumes, and the capacity is equal ...

    • Estimating Salt Loads in High Water Table Areas. II: Regional Salt Loads 

      R. J. Nathan; L. B. Mudgway (American Society of Civil Engineers, 1997)
      This paper describes the development of MIDASS, a lumped conceptual model for the prediction of streamflow and salt yield from irrigated catchments with high water tables. The model is suited for application to medium-sized ...

    • Response of Electromagnetic Conductivity Meter to Soil Salinity and Soil-Water Content 

      B. R. Hanson; K. Kaita (American Society of Civil Engineers, 1997)
      The effect of soil salinity and soil-water content on the apparent soil electrical conductivity as measured with the EM-38 electromagnetic conductivity meter has been investigated. Results showed substantial changes in the ...

    • Use of Rubber Dams for Flood Mitigation in Hong Kong 

      Paul Wing Ming Tam (American Society of Civil Engineers, 1997)
      Rubber dams are constructed by the Agriculture and Fisheries Department in Hong Kong for the replacement of polluted agricultural weirs that are still in use. The main purpose of these dams is to impound water for irrigation. ...

    • Discussion and Closure: Alternative Design of Square-Rooting Measuring Device in Open Channel 

      V. N. Diwanji; R. G. Patil; V. K. Tripathi; K. Keshava Murthy; M. N. Shesha Prakash (American Society of Civil Engineers, 1997)

    • Drainage Design for Water Quality Management: Overview 

      J. C. Guitjens; J. E. Ayars; M. E. Grismer; L. S. Willardson (American Society of Civil Engineers, 1997)
      Drainage design for water quality management in irrigated areas requires use of hydrodynamic models that delineate flow paths of subsurface water moving to drains. Use of only traditional drainage design equations for ...

    • Discussion: Canal Design by Dynamic Programming 

      Nathan Buras (American Society of Civil Engineers, 1997)

    • Estimating Salt Loads in High Water Table Areas. I: Identifying Processes 

      L. B. Mudgway; R. J. Nathan; T. A. McMahon; H. M. Malano (American Society of Civil Engineers, 1997)
      This paper describes the detailed investigation on a 9 ha irrigated site with high water tables in the Tragowel Plains (Australia) of salt transport processes from shallow ground water to surface drainage. An intensive ...

    • Model to Design Level Terraces 

      Fernando Falco Pruski; Paulo Afonso Ferreira; Márcio Mota Ramos; Paulo Roberto Cecon (American Society of Civil Engineers, 1997)
      A procedure was developed to determine the maximum surface runoff volume (MSR) employing the constant rate of infiltration after prolonged wetting of the soil (

    • Decision Support Model for Irrigation Water Management 

      S. Prajamwong; G. P. Merkley; R. G. Allen (American Society of Civil Engineers, 1997)
      A software package called Command Area Decision Support Model (CADSM) was developed to estimate aggregate crop-water requirements and to study management options for irrigated areas. Daily water and salt balances are ...

    • Optimal Nonlinear Predictive Control for Canal Operations 

      Flavio G. de Albuquerque; John W. Labadie (American Society of Civil Engineers, 1997)
      The predictive canal operation method (PCOM) provides optimal real-time control of irrigation canals with incorporation of current and forecasted demands. PCOM utilizes an efficient, nonlinear, optimal control algorithm ...

    • Stable Width of an Alluvial Channel 

      Mohammad N. Cheema; Miguel A. Mariño; Johannes J. DeVries (American Society of Civil Engineers, 1997)
      Alluvial channels, in the context of this paper, are unlined man-made channels with predetermined bed slopes used to convey water that carries sediment. An extremal hypothesis is presented, namely, an alluvial channel ...

    • Discussion and Closure: New Approach to Design of Culverts 

      J. S. Montes; B. Dasika (American Society of Civil Engineers, 1997)

    • Metal Transport within a Small Urbanized Watershed 

      Helena M. Solo-Gabriele; Frank E. Perkins (American Society of Civil Engineers, 1997)
      Hydrograph separation techniques are used to interpret metals (Fe, Cr, Cu, and metalloid As) data within the Aberjona River watershed, a highly urbanized watershed located near Boston. Results indicate that streamflow can ...

    • Performance-Based Maintenance for Irrigation Systems 

      B. P. Thoreson; D. C. Slack; R. P. Satyal; R. S. S. Neupane (American Society of Civil Engineers, 1997)
      A framework for determining the effect of maintenance events on irrigation system flows is described. Standard definitions for corrective and preventive maintenance are presented and two maintenance objectives and six ...

    • Consumptive Use and Return Flows in Urban Lawn Water Use 

      Ramchand Oad; Kevin Lusk; Terry Podmore (American Society of Civil Engineers, 1997)
      Research was conducted to estimate grass consumptive use and return flow (deep percolation) in urban lawn water use. Two types of small lysimeters were used—a drainage-type lysimeter of 40 cm diameter and 60 cm depth and ...

    • Comparison of Numerical Procedures for Gate Stroking 

      E. Bautista; A. J. Clemmens; T. Strelkoff (American Society of Civil Engineers, 1997)
      A study was conducted to compare three existing solution methods for the inverse problem of unsteady open-channel flow (i.e., gate stroking). Both the accuracy of the results and the robustness of the methods were examined. ...

    • Discussion and Closure: Comparison of Methods for Estimating REF-ET 

      S. Mohan; N. Arumugam; D. M. Amatya; R. W. Skaggs; J. D. Gregory (American Society of Civil Engineers, 1996)