Journal of Irrigation and Drainage Engineering: Recent submissions
Now showing items 3721-3740 of 3826
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Electrical Resistivity for Estimating Ground‐Water Recharge
(American Society of Civil Engineers, 1985)In the unsaturated zone, fine-grained soils tend to exist in situ at higher degrees of saturation than coarse-grained soils. As a result, fine-grained soils generally will exhibit lower resistivities than coarse-grained ... -
Chemical Reactions Within Root Zone of Arid Zone Soils
(American Society of Civil Engineers, 1985)The quality of an irrigation water, in both its total salinity and individual constituents, influences the chemical character of the soil solution and irrigation return flows including drainage waters. Dissolution, ... -
Reuse System Design for Border Irrigation
(American Society of Civil Engineers, 1985)A procedure is presented for designing a system to reuse runoff from free outflow irrigation borders. Runoff volumes are obtained using four dimensionless variables and runoff curves developed with a zero‐inertia mathematical ... -
Discussion of “<i>Hydraulics of Perforated Irrigation Trail Tube</i>” by Shu‐Tung Chu (March, 1984)
(American Society of Civil Engineers, 1985) -
Free Flow Discharge Characteristics of Throatless Flumes
(American Society of Civil Engineers, 1985)A theoretical analysis of the free flow discharge characteristics of the throatless flume is presented. A pressure correction factor which accounts for the non‐hydrostatic pressure distribution at the control (throat) ... -
Flood Storage in Reservoirs
(American Society of Civil Engineers, 1985)Flood storage in reservoirs controlled by free‐overflowing, rectangular spillways is investigated by accounting for arbitrary reservoir bathymetry and single‐peaked inflow hydrographs. The general solution of the storage ... -
Drainage Coefficients for Heavy Land
(American Society of Civil Engineers, 1985)Due to the impeding nature of the subsoil, drainage discharge from heavy land predominantly takes the forms of lateral interflow through the more permeable toplayer and of overland flow. Evidence is presented that this ... -
Furrow Irrigation Simulation Time Reduction
(American Society of Civil Engineers, 1985)Temporal and spatial changes in the flow profile decrease with time under furrow irrigation, and these slow changes suggest modifications in the simulation methods. Geometrically increasing time steps and node deletion at ... -
Electronic Clocks for Timing Irrigation Advance
(American Society of Civil Engineers, 1985)Low-cost electronic digital ``stick-on'' clocks were modified and used with a water sensor to determine irrigation rate-of-advance. The clock-sensors, spaced intermittently in a test furrow or in a border or basin, were ... -
Irrigation Scheduling Using Crop Indicators
(American Society of Civil Engineers, 1985)Petiole water content and canopy temperature of cotton were used as indicators of stress in cotton. A crop water stress index (CWSI) using remotely sensed canopy temperature was a better indicator of plant stress than was ... -
Drainage Due to Gravity Under Nonlinear Law
(American Society of Civil Engineers, 1985)A gravity drainage problem for a horizontal soil stratum underlain by a highly pervious material is analyzed. A non-linear relation between velocity and gradient is assumed. Capillary rise is also taken into account. The ... -
Agricultural Benefits for Senegal River Basin
(American Society of Civil Engineers, 1985)A multipurpose water resource development project is proposed for construction and development in West Africa. The plans include the irrigation of an area of 274,805 ha by the year 2030 in three countries: Senegal, Mauritania, ... -
Miscible Displacement Porous Media: MOC Solution
(American Society of Civil Engineers, 1985)The method of characteristics (MOC) was revised to solve convective‐dispersion equations in a two‐dimensional, integrated saturated‐unsaturated porous medium. Instead of usual bilinear interpolation schemes, the revised ... -
Channel Design and Flow Operation Without Choke
(American Society of Civil Engineers, 1984)Using one dimensional flow analysis, curves are calculated for designing channel transitions so as to avoid choke. The prevention of choke is achieved by insuring that the flow in the channel below the imposed transition ... -
Closure to “<i>Head Loss at Soil‐Drain Envelope Interfaces</i>” by David W. Miller and Lyman S. Willardson (June, 1983)
(American Society of Civil Engineers, 1984) -
Discussion of “<i>Head Loss at Soil‐Drain Envelope Interfaces</i>” by David W. Miller and Lyman S. Willardson (June, 1983)
(American Society of Civil Engineers, 1984) -
Discussion of “<i>Head Loss at Soil‐Drain Envelope Interfaces</i>” by David W. Miller and Lyman S. Willardson (June, 1983)
(American Society of Civil Engineers, 1984) -
Modified Venturi Channel
(American Society of Civil Engineers, 1985)Flumes having a local diminution of channel width are widely used as discharge measurement structures. The present investigation considers the modified version of a cylinder positioned axially in a nearly horizontal, ... -
Design of Stable Alluvial Canals in a System
(American Society of Civil Engineers, 1985)A graphical method for the design of stable alluvial canals connected in a distributary system is presented. Under a given plan for water distribution, this method may be used to determine the stable width, depth and slope ... -
Evaluation of Hydrologic Models Used to Quantify Major Land‐Use Change Effects
(American Society of Civil Engineers, 1985)An evaluation was made of the capabilities of watershed models when applied in the absence of site calibration data and limited validation data to predict the effects of major land‐use changes upon hydrology. Members of ...