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The computer programs for levee underseepage analyses-LEVEEMSU (finite difference), LEVSEEP (closed form), and SEEP (finite element)-were used to analyze a levee and foundation section described in this report. Results presented in this study illustrate the effect of variations in the ratio of permeability of the foundation %) to the permeability of the blanket (I%) on the flow predictions, the influence of introducing anisotropic conditions on flow domain, arid variation in the predicted hydraulic gradients in relation to the analysis method. Analysis results are reported in terms of landside exit hydraulic gradients and permeability ratios., Prepared in collaboration with West Virginia University, Morgantown, WV.

The computer program LEVSEEP version 3.0 is presented for use in the analysis of levee underseepage. This version of the program includes a two-layer analysis model for levees with a top blanket over a pervious foundation. The software calculates seepage flow and substratum pressure for either physical and geometric properties (initial conditions) or field piezowmeter readings; analyzes the effects of various control measures (namely, landside berms, riverside blankets, cutoffs, and relief wells); plots cross sections, piezometer data, and control measures; provides quantity and cost estimates of each of these control measure alternatives; and gives a complete summary of all calculations. The procedures for berm analysis employed within LEVSEEP reflect the current Corps guidance discussed in EM 1110-2-1913 (Headquarters, Department of the Army 1978). The procedures for riverside blanket analysis are as presented in TM 3A24 (U.S. Army Engineer Waterways Experiment Station 1956). Procedures for analysis of cutoffs are based on the method of fragments as presented by Harr (1962). The procedures for relief well system analysis reflect Corps guidance as presented in EM 1110-2-1913. Specific equations and procedures used for well analysis were taken from TM 3A24 and Engineer Bulletin 55-11 (Headquarters, Department of the Army 1955). The well procedure is for infinite, partially penetrating, or fully penetrating well systems under artesian flow; it does not apply to finite length systems or pumped systems. Example problems and case studies are presented LEVSEEP provides a convenient analysis tool that should allow designers to approximately model actual field conditions. However, flood protection is a complex system involving design, construction, maintenance, and performance evaluation of levees.

Technical Report GL-95-10 July 1995 US Army Corps of Engineers Waterways Experiment Station LEVSEEP: Analysis Software for Levee Underseepage and Rehabilitation by Anthony L. Brizendine, Fairmont State College Hugh M. Taylor, Jr., WES M. A. Gabr, West Virginia University Approved For Public Release; Distribution Is Unlimited TA 7. W34t GL-95-10 1995 Prepared for Headquarters, U.S. Army Corps of Engineers fc’JiCQU Cl RCCUi;- ; DStiVSI) 1 The contents o f this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. DATE DUE GAYLORD PRINTED IN U.S.A. Q5V O BUREAU OF RECLAMATIONJMVER LIBRARY C 'l 92065302 Technical Report GL-95-10 July 1995 LEVSEEP: Analysis Software for Levee Underseepage and Rehabilitation by Anthony L. Brizendine Fairmont State College Fairmont, WV 26554 Hugh M. Taylor, Jr. U.S. Army Corps of Engineers Waterways Experiment Station 3909 Halls Ferry Road Vicksburg, MS 39180-6199 M. A. Gabr West Virginia University Morgantown, WV 26505-6101 Final report Approved for public release; distribution is unlimited Prepared for U.S. Army Corps of Engineers Washington, DC 20314-1000 92065302 Waterways Experiment Station Cataloging-in-Publication Data Brizendine, Anthony L. LEVSEEP : analysis software for levee underseepage and rehabilitation / by Anthony L. Brizendine, Hugh M. Taylor, Jr., M.A. Gabr ; prepared for U.S. Army Corps of Engineers. 171 p. : ill. ; 28 cm. — (Technical report ; GL-95-10) Includes bibliographic references. 1. Levees — Evaluation — Computer programs. 2. Levees — Analysis — Computer programs. 3. Seepage — Analysis — Computer programs. I. Taylor, Hugh M. II. Gabr, Mohammed A. III. United States. Army. Corps of Engineers. IV. U.S, Army Engineer Waterways Experiment Station. V. Geotechnical Laboratory (U.S. Army Engineer Waterways Experiment Station) VI. Title. VII. Title: Analysis software for leve