ACKNOWLEDGMENTS. The writer wishes to acknowledge his appreciation of the assist- ance given him by Mr. Jas. D. Schuyler, M. Am. Soc. C. E., Con- sulting Hydraulic Engineer, in reviewing this paper, and in making suggestions of value. Appendix II. contains a list of authors whose writings have been freely consulted, and to whom the writer is indebted the numerous citations in the body of the paper further indicate the obligations of the writer. Introductory CONTENTS. CHAPTER I. CHAPTER II. Preliminary Studies and Investigations CHAPTER III. PAGE Outline Study of Soils. Puddle 12 CHAPTER IV. The Tabeaud Dam, California 17 CHAPTER V. Different Types of Earth Dams 33 CHAPTER VI. Conclusions 63 APPENDIX I. Statistical Descriptions of High Earth Dams 67 APPENDIX II. Works of Reference... ..68 I ILLUSTRATIONS. PAGE Fig. I. Longitudinal Section of Yarrow Dam Site 10 2. Cross-Section of the Yarrow Dam 10 3. Plan of the Tabeaud Reservoir 17 4. Tabeaud Dam Plan Showing Bed Rock Drains ..18 5....