TY - SER TI - Journal of the Irrigation and Drainage Division. Vol. 117 No. 1 (1991) PY - 0000///[date of publication not identified] CY - New York : American Society of Civil Engineers. N1 - It contains of Papers, Editorial, Notes and Discussions, Errata for 1991 in Vol. 117 No. 1; EDITORIAL. TECHNICAL PAPERS : SECTAR for Economically Optimal Sustained Ground-Water Yield Planning / R. C. Peralta, K. Asghari, and R. Shulstad. Subsurface Micro-irrigation with Effluent / Gideon Oron, Joel DeMalach, Zafrir Hoffman and Rodica Cibotaru. Drop Manholes in Supercritical Pipelines / George C. Christodoulou. Dynamic-Node-Numbering Concept in Channel Network Model / Tahir Husain, Hasin U. Khan, and Suhail M. Khan. Method for Determination of Hydraulic Conductivity in Unsaturated Porous Media / Abolfazl Shamsai and Nicholas Sitar. Design Procedure for Flow over Side Weirs / Ali Uyumaz and Roger H. Smith. Practical Two-Stage Pipe Expansions for Centrifugal Pumps / Walter L. Trimmer and John A. Fazio. Evapotranspiration Estimation for Data-Short Environment / Sun F. Shih and Ke S. Cheng. Drainage-Sub-irrigation Effect on Water Quality in Georgia Flatwoods / D. L. Thomas, A. Shirmohammadi, R. R. Lowrance and M. C. Smith. TECHNICAL NOTE : Space Solution of Kinematic-Wave Model by Time Iteration / W. W. Wallender and Junji Yokokura. DISCUSSIONS : Prediction of Class A Evaporation in Southwest Idaho. Clayton L. Hanson / Nazeer Ahmed. Closure by author. Open Channel Flow through Transverse Floor Outlets. A. S. Ramamurthy, Duc Minh Tran, and L. B. Carballada / Willi H. Hager. Closure by authors. ERRATA ER -