Journal of Irrigation and Drainage Engineering: Recent submissions
Now showing items 3381-3400 of 3826
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Erratum: “Improved Inverted V‐Notch or Chimney Weir by K. Keshava Murthy and D. P. Giridhar (May/June, 1990, Vol. 116, No. 3)
(American Society of Civil Engineers, 1990) -
Observability of Surface Irrigation Advance
(American Society of Civil Engineers, 1990)The conditions of observability and field‐parameter identifiability for surface irrigation advance are examined by analytical' techniques and the linearized zero‐inertia model. The existence and uniqueness of the inverse ... -
Dynamic Response of Automatic Water‐Level Controller. Part II: Application
(American Society of Civil Engineers, 1990)Constant water‐level controllers of various kinds are used within many irrigation canal distribution systems. In a companion paper, simple transfer‐function equations were developed for one style of automatic water‐level ... -
Furrow Infiltration on Nontilled Beds with Cracking Soils
(American Society of Civil Engineers, 1990)A recirculating furrow infiltrometer is used to determine the effect of three flow rates on infiltration for nontilled beds established on a red‐brown earth soil (heavy clay soil) in the Goulburn‐Murray irrigation region ... -
Erratum: “Xiangtan Q‐Type Automatic Hydraulic Flap Gate” by Luo Guang Jiong (March/April, 1990, Vol. 116, No. 2)
(American Society of Civil Engineers, 1990) -
Dynamic Response of Automatic Water‐Level Controller. I: Theory
(American Society of Civil Engineers, 1990)Controllers that maintain constant water levels at various locations within irrigation canal distribution systems are used in a number of locations. Most are custom‐developed and tested on a particular system or direct ... -
Self‐Adaptive Control of Surface Irrigation Advance
(American Society of Civil Engineers, 1990)The controllability of surface irrigation advance is examined by analytical means and numerical tests based on the linearized zero‐inertia model. First, the inflow hydrograph is proved to be identifiable from advance data. ... -
Runoff Prediction Uncertainty for Ungauged Agricultural Watersheds
(American Society of Civil Engineers, 1990)A physically based stochastic watershed model is used to estimate runoff prediction uncertainty for small agricultural watersheds in Hastings, Nebraska. The stochastic nature of the model results from postulating a ... -
Pump Test Analysis of Leaky Aquifer
(American Society of Civil Engineers, 1990)The storage coefficient, transmissivity, and leakage factor are the useful parameters that assess the ground‐water potential of a leaky aquifer. These parameters can be determined with the help of pump test data by using ... -
Soil Nitrate Profiles under Irrigation on Coastal Plain Soils
(American Society of Civil Engineers, 1990)Soil samples were taken from the surface to a depth of 152 cm on 16 irrigated sites and one forested site in the fall of 1983. All but one of the irrigation sites had corn grown on it in four out of the previous five years. ... -
Estimation of Surface Irrigation Parameters
(American Society of Civil Engineers, 1990)The basic concepts and procedures for the estimation of roughness and infiltration parameters encountered in surface irrigation are presented. A review of existing predictive and nonpredictive parameter‐estimation methods ... -
Rational Approach for Modifying Rotational Water Delivery Schedule
(American Society of Civil Engineers, 1990)An analysis of water‐delivery schedules is made based on a water‐balance simulation approach using a crop growth simulation model. Five rotational schedules of two, three, four, five, and six weeks were compared to an ... -
Single‐Outlet Detention‐Pond Analysis and Design
(American Society of Civil Engineers, 1990)A desktop method is presented to analyze or size detention ponds and outlet facilities. Different initial conditions are allowed. When used for design purposes, the method determines the size of the outlet facility for a ... -
Mathematical Zero‐Inertia Modeling of Surface Irrigation: Advance in Borders
(American Society of Civil Engineers, 1990)A basis for comprehensive analytical models, equations, and their solutions for border or furrow irrigation advance is derived. This basis consists of an analytical solution of the zero‐inertia (ZI) differential equations, ... -
Local Optimal Control of Irrigation Canals
(American Society of Civil Engineers, 1990)This paper presents a local optimal control technique (control of an individual gate) for operation of an irrigation canal with a single reach. By using the concepts of control theory, an expression for an upstream gate ... -
Model of Flow in Regulated Open‐Channel Networks
(American Society of Civil Engineers, 1990)A numerical model is developed to simulate unsteady flow in open‐channel networks. The model is an improvement over currently available network models in that the effects of hydraulic structures and leakage through the ... -
Water and Nitrogen Management in Central Platte Valley of Nebraska
(American Society of Civil Engineers, 1990)Contamination of ground water by nitrogen leached from fertilizer on irrigated soils is related to the quantity of nitrate‐N -
Streamflow Simulation Using Deterministic Model
(American Society of Civil Engineers, 1990)The National Weather Service River Forecast System (NWSRFS) model is used to generate 30 years of sequential streamflows for Laguna de Santa Rosa in northern California. The model is calibrated by simulating 11 years of ... -
Unsteady Drawdown of Water Table
(American Society of Civil Engineers, 1990)This paper deals with the development of equations to predict water‐table geometry for flow toward a drain ditch or reservoir whose water surface level is subject to a sudden specified drop. A closed function representing ... -
Rainfall‐Reaeration Effects
(American Society of Civil Engineers, 1990)The effect of rainfall intensity on reaeration has not been adequately reported in the literature. It is clear that rainfall causes surface turbulence and increases reaeration, and a significant linear relationship (r = ...