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<br />. <br /> <br />PREFACE <br /> <br />The series of manuals on techniques describes procedures for planning <br />and executing specialized work in water-resources investigations. The ma- <br />terial is grouped under major subject headings called books and further <br />subdivided into sections and chapters; section B of book 4 is on surface <br />water. <br />The unit of publication, the chapter, is limited to a narrow field of <br />subject matter. This format permits flexibility in revision and publication <br />as the need arises. <br />Provisional drafts of chapters are distributed to field offices of the U.S. <br />Geological Survey for their use. These drafts are subject to revision because <br />of experience in use or because of advancement in knowledge, techniques, <br />or equipment. After the technique described in a chapter is sufficiently <br />developed, the chapter is published and is for sale by the Superintendent <br />of Documents, U.S. Government Printing Office, Washington, D.C. 20402. <br /> <br />III <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />--"----- <br />