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<br />some "permissible" failure which we felt was more than is practical in <br />field applications. Our experience with riprap construction practices <br />over the 1 ast year c1 early fndi cated a ,need for a safety factor in the <br />design of riprap channel linings. <br /> <br />As the accompanying volume of paper implies, this revision was a <br />major effort on the part of the Urban Drainage and Flood Control <br />District. I want to acknowledge the work by Alex Kingston in a$sisting <br />with the graphics contained in this report. I also wish to thank Cindy <br />Griego for her patience and perseverence in getting these changes typed <br />and printed. I also want to acknowledge two individuals that while <br />working with the District as student interns provided me with the data <br />analysis assistance needed to revi'se the Colorado Urban Hydrograph <br />procedures. Without the help of Rodney Hutcheson and Steve Hogoboom <br />this update would not have been possible. <br /> <br />Please keep as informed of any address changes so that we can keep <br />providing you with our Manual updates. Unless you do so, we have no way <br />of insuring the revisions will reach you. Also, if you have any <br />suggestions in how to improve our Manual, we ask you to send them to us. <br />