Editor’s Note

The September October issue of the Journal of Irrigation and Drainage Engineering has eight papers, two technical notes, two discussions, and a closure. The first four papers deal with irrigation water use and management. The first paper, by Haley et al., describes a study that documents residential water use in central Florida. The second paper, by Pandey et al., also is from Florida. It describes a two-year study conducted on a vegetable farm in southern Florida to develop and evaluate an improved soil-moisture based irrigation management practice. The improved practice reduced water use by 36%.

The third paper, by Kovoor and Nandagiri, used three different multivariate regression models to predict daily pan evaporation at four sites with widely varying climatic conditions in India. Similar prediction accuracies were obtained for all three models. The fourth paper, by Wen et al., describes a regional irrigation water-demand planning model to establish appropriate cropping patterns and estimate irrigation water demand for the Chin-Nan irrigation area in Taiwan.

The next three papers deal with hydrologic simulation. The fifth paper, by Rajeswari et al., describes a simulation study using a rainfall-infiltration model to identify superior soil amendments for a clay loam vertisol for maximum infiltration and suitable aggregate stability. A total of five soil amendments were tested under dry and wet soil conditions and two rainfall intensities. The data was used to calibrate an infiltration model for each soil amendment. The sixth paper, by Geetha et al., describes a study in which the existing Soil Conservation Service Curve Number model was modified in two ways by varying the curve number using antecedent moisture conditions and antecedent moisture amount. The two modeling approaches were applied to four catchments in India to simulate daily streamflow. The seventh paper, by Das, describes the development of a chance constrained optimization model for the Muskingum model parameter estimation for the flood routing equations.

The last paper, by Manekar et al., describes a study in which they tested seven different sizes of cutthroat flumes under free-flow conditions. Regression analysis of the data was carried out between all possible pairings of dimensionless parameters to select the best pair to develop a relationship between head and discharge.

The first technical note, by Loáiciga, outlines the development of equations to describe the flooding process in basin irrigation or wetland flooding. The second technical note, by Swamee and Singh, describes the development of a modified well function equation to estimate the storage coefficient and transmissivity from slug test data on large diameter wells without using the curve matching procedure.