Journal of Irrigation and Drainage Engineering: Recent submissions
Now showing items 2581-2600 of 3826
-
Simultaneous Flow over and under a Gate
(American Society of Civil Engineers, 2001) -
Interaction of Stream and Sloping Aquifer Receiving Constant Recharge
(American Society of Civil Engineers, 2001)An analytical solution and finite-element numerical solution of a linearized and nonlinear Boussinesq equation, respectively, were obtained to describe water table variation in a semi-infinite sloping/horizontal aquifer ... -
Long-Term Effects of Irrigation Water Conservation on Crop Production and Environment in Semiarid Areas
(American Society of Civil Engineers, 2001)As water is becoming a scarcer commodity, savings in the irrigation sector could enhance water development in areas currently not being irrigated, and arrest the rapid environmental degradation due to waterlogging in arid ... -
Assessing Sensitivity Factors of Irrigation Delivery Structures
(American Society of Civil Engineers, 2001)The flow behavior along an open-channel irrigation network can be assessed by determining the sensitivity of the irrigation structures. The importance of governing factors of the sensitivity and proportionality indicators ... -
Model for Estimating Evaporation and Transpiration from Row Crops
(American Society of Civil Engineers, 2001)Accurate estimates of crop evapotranspiration -
Functional Relationship to Describe Drains with Entrance Resistance
(American Society of Civil Engineers, 2001)Numerical flow models usually represent drains as a system dependent boundary condition. If soil is saturated, drains act as the Dirichlet boundary condition with pressure head set equal to zero, and if soil is unsaturated, ... -
Sprinkler and Corn Canopy Effects on Water Application Characteristics
(American Society of Civil Engineers, 2001)Water application characteristics of a very low pressure spray sprinkler (40 kPa), a low pressure spray sprinkler (100 kPa), a medium pressure impact sprinkler (170 kPa), and a high pressure impact sprinkler (345 kPa) were ... -
Sediment Pick-Up on Stream-Wise Sloping Beds
(American Society of Civil Engineers, 2001) -
New Algorithm for Hydraulic Calculation in Irrigation Laterals
(American Society of Civil Engineers, 2001)A new approach for solving lateral hydraulic problems in laminar or turbulent flow is presented. The outflow is treated as a discrete variable event by means of Taylor polynomials used to calculate flow rates along the ... -
Transient Drainage to Partially Penetrating Drains in Sloping Aquifers
(American Society of Civil Engineers, 2001) -
Case Study of Water Table Evaporation at Ichkeul Marshes (Tunisia)
(American Society of Civil Engineers, 2001)The method of Gardner was used to estimate the evaporation rate from bare soils under high water table conditions, at Ichkeul marshes, of northern Tunisia. For this purpose, water content, soil-water suction, and water ... -
Design of Minimum Seepage Loss Canal Sections with Drainage Layer at Shallow Depth
(American Society of Civil Engineers, 2001)This paper presents an analytical solution for the quantity of seepage from a rectangular canal underlain by a drainage layer at shallow depth. The solution has been obtained using inverse hodograph and conformal mapping. ... -
Selection of Sprinkler Lateral for Shorter Life Cycle
(American Society of Civil Engineers, 2001)This paper presents a methodology to select a sprinkler lateral from different design alternatives for a duration shorter than its full life cycle. The selection is made by determining the time period up to which an ... -
Robust Flow Control of Single Input Multiple Outputs Regulated Rivers
(American Society of Civil Engineers, 2001)Regulated rivers are used in many countries to sustain summer low flows and supply water for different users (drinking water, industries, irrigation, hydropower, salubrity). An upstream dam is used as storage, and the river ... -
Modeled Areal Evaporation Trends over the Conterminous United States
(American Society of Civil Engineers, 2001)Long-term (1961–1990) areal evapotranspiration ( -
Numerical Analysis for Lateral Weir Flow
(American Society of Civil Engineers, 2001)A theoretical analysis based on the energy principle for discharge over side weirs was presented, and its application was demonstrated using a numerical approach. The decrease in water surface elevation in lateral direction ... -
Comparison of Fixed and Rotating Spray Plate Sprinklers
(American Society of Civil Engineers, 2001)A comparative study of two types of spray sprinklers was performed. Rotating spray plate sprinklers (RSPSs) and fixed spray plate sprinklers (FSPSs) were evaluated individually in open field conditions. The water distribution, ... -
Habitat Restoration and Agricultural Production under Land Retirement
(American Society of Civil Engineers, 2001)Current land retirement programs seek to address drainage management challenges in the western San Joaquin Valley of California using a willing seller strategy. In choosing between available parcels, the program managers ... -
Sprinkler Technologies, Soil Infiltration, and Runoff
(American Society of Civil Engineers, 2001)Previous simulation studies dealing with surface runoff use mathematical models based on a single soil infiltration relationship to estimate the influence of irrigation application depths and rates on surface runoff depths. ... -
Optimal Furrow Design. II: Explicit Calculation of Design Variables
(American Society of Civil Engineers, 2001)The furrow irrigation system design problem (at minimum cost) is significantly simplified by analytically solving it. For a specified furrow length, a simple algebraic equation is derived to directly calculate the appropriate ...