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<br />FOREWORD <br /> <br />Since publication of the original paper of this title in July <br />1952, the general concept of runoff frequency analysis contained <br />in the paper has been used and developed extensively by the Corps <br />of Engineers and other organizations. It is considered appropriate <br />at this time to expand the paper to include the new developments <br />and associated computation techniques and examples. <br /> <br />While there are yet many difficulties encountered in applica- <br />tion, the method of frequency analysis originally proposed (loga- <br />rithmic Pearson Type Ill) has been generally very successful in <br />the accurate and rapid determination of extreme flood frequencies. <br />It is considered adequate for all hydrologic frequency applica- <br />tions, and consequently, the treatment herein is still restricted <br />to the originally proposed method. In the interest of simplicity, <br />terms and concepts that are not strictly necessary to this method <br />are not discussed, even though they may be in common use in <br />hydrologic statistics. <br /> <br />So many have contributed toward the material contained herein <br />that it is impossible to acknowledge even the principal contributors. <br />However, most of the newer developments originated under the Civil <br />Works Investigations program of the Corps of Engineers, particularly <br />the project conducted in the Sacramento District under the direction <br />of the writer and under the general administration of Mr. F. Kochis, <br />Chief of the Engineering Division, and Mr. A. Gomez, Chief of the <br />Planning and Reports Branch. Mr. A. L. Cochran in the Office, Chief <br />of Engineers, has guided the program and has provided invaluable support <br />and constant encouragement. <br /> <br />r <br />I <br /> <br />..-.- <br />