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INTENT OF REPORT <br />It is the intent of this report to show briefly, but completely, all the <br />existing and future drainage problems of the West Greeley area. These prob- <br />lems are presented in sufficient detail and with as many exhibits, charts, <br />and maps as are necessary to fully explain the program to the layman and <br />technician alike. Every effort has been made to include all the major items <br />of consideration in the development of the final improvement program. <br />TERMINOLOGY AND ABBREVIATIONS <br />The following list of technical terms and abbreviations has been pro- <br />vided so that the reader may more readily understand the meaning of certain <br />' parts of this report. <br />Drainage facilities - -All culverts, channels, ditches, and retention <br />' ponds included as an integral part of present and future drain- <br />age water transportation system. <br />' Storm drain sewers -- Included herein are all lateral, trunk, and out - <br />fall sewers. These are buried pipe of various sizes which are <br />designed to pick up the storm water from other sewers or drain- <br />' age inlets and transport the water to a satisfactory discharge <br />point where it no longer will be a problem. <br />Storm frequency- -The frequency with which a storm of known intensity <br />is likely to occur. <br />' Rainfall intensity- -The rate of rainfall measured in inches per hour. <br />Imperviousness factor- -The percentage of the area under study which <br />' is impervious to water. <br />Run -off coefficient - -The percentage of the rainfall that is expected <br />' to run off as surface water during a particular storm. <br />Run- off -- Storm water that is not absorbed by the ground or otherwise <br />' intercepted and retained and is therefore contributing to the <br />drainage quantities. <br />' Sewer capacity - -That quantity of storm water that a particular size <br />pipe is capable of carrying on a specified slope or grade. <br />This is usually measured in cubic feet per second. <br /> I ' - 2 - <br />