Drainage Principles and Applications II. [antikvár]

•'I PREFACE This book is the second of four Volumes containing the edited lecture notes of the International Course on Land Drainage, which is organized annually in Wageningen, The Netherlands. In the Course an effort is made to cover, as completely as possible and within a period of three months, the basic principles of land drainage and their application. As mentioned in the Introduction to Volume I, the authors - all specialists in their particular fields - do not profess to have treated their subject matter exhaustively; within the limited time available, it is impossible for them to discuss all details of their subjects. This second Volume presents the basic principles of land drainage by gravity and wells. It also deals with salt balances, leaching requirements, effects of irrigation on drainage, field drainage criteria, and mathematical models for different types of groundwater flow and for watershed runolf. The book can be used independently of the other Volumes although, to avoid repetition, reference is often made to their chapters. Volume I, issued in August 1972, treats basic elements, physical laws governing groundwater flow, and concepts of the plant-soil-water system in which the processes of land drainage take place. The forthcoming Volumes III and IV will discuss the various surveys and investigations required to determine the parameters of the plant-soil-water system which are to be introduced into the drainage design computations; and will also treat the design and dimensioning of drainage systems, some of the main engineering features, and aspects of operation and maintenance. The reasons why the lecture notes of the Course are being published have been explained in the Preface and Introduction in Volume I. It was mentioned in that Preface that, after the original Editorial Committee under the chairmanship of Mr. P. J. Dieleman had broken up, a Working Group was formed to finish the job. This group consisting of members of the Institute's staff, has made no substantial changes in the