Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 17. This volume presents 113 technical papers drawn from the International Symposium on Man-Made Lakes, Their Problems and Environmental Effects, Knoxville, Tennessee, May 3-7, 1971. Some excellent papers were omitted in order to present in the space of one volume those papers most directly concerned with the man-made water body as opposed either to more remote upstream and downstream relationships or to topics equally applicable to natural water bodies. The multidisciplinary character of the symposium also was a guide to selection. The summary papers presented by principal speakers at the plenary sessions are included, but these have been abbreviated to avoid repetition of factual material in the papers that follow.