TY - SER TI - Journal of The Hydraulics Division. Vol. 106 No. 4 (1980) PY - 0000///[date of publication not identified] CY - New York : American Society of Civil Engineers. N1 - It contains of Papers, Discussion on April 1980 in Vol. 106 No. 4; Economic Model for Urban Watersheds / Thomas N. Debo and Gerald N. Day. New Routing Model for Continuous Runoff Simulation / M. S. K. Chowdhury and F. C. Bell. Two-Dimensional Tidally Averaged Estuarine Model / Wen-Sen Chu and William W-G. Yeh. Finite Element Method for Direct Runoff Flow / Mutsuto Kawahara and Teruyuki Yokoyama. Laboratory Verification of a Dam-Break Flood Model / Cheng-lung Chen. Dispersion in Two-Layer Stratified Water Bodies / George C. Christodoulou and Jerome J. Connor. Turbulence Prediction in Open Channel Flow / Ruh-Ming Li, James D. Schall, and Daryl B. Simons. Force Fluctuations on SRI of Hydraulic Jump / Rangaswami Narayanan and Loizos S. Schizas. TECHNICAL NOTES : Proc. Paper 15305 - Perturbation Solutions for Water-Table Aquifers / Edmund A. Prych. Steady Solution for River Flow / Robert F. Allen. Collapsible-Bag Suspended-Sediment Sampler / Herbert H. Stevens, Jr., Gale A. Lutz, and David W. Hubbell. Cavitation Induced by Turbulence in Stilling Basin / Rangaswami Narayanan. DISCUSSION : Proc. Paper 15301 - Steepness of Sedimentary Dunes by Mehmet Selim Yahn and Emin Karahan (Apr., 1979. Prior Discussions: Jan., Feb., 1980) / Jorgen Fredsoe. Uncertainty in Step-Backwater Analysis by Asok Motayed and David R. Dawdy (May, 1979) / Jeffrey B. Bradley and Karl W. Eriksen. Flow Resistance in Cobble and Boulder Riverbeds by Daryl B. Simons, Khalid S. Al-Shaikh-Ali, and Ruh-Ming Li (May, 1979. Prior Discussion: Feb., 1980) / Henry C. Riggs. Urbanization Impact on Streamflow by Leo R. Beard and Shin Chang (June, 1979) / Asok K. Motayed ER -