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<br />iii <br /> <br /> <br />Walsh, James Paul Jr. (M.S., Geology) <br /> <br />Drainage Basins and Areas of Past Flooding in the Windsor Area, <br /> <br />Colorado <br /> <br />Thesis directed by Associate Professor T. Nelson Caine <br /> <br />Eight quadrangle maps showing drainage basins end areas of <br /> <br />past flooding are presented for the Windsor area of Colorado: These <br /> <br />maps can be used to define, areas of surface ,water collection. Basin <br /> <br />patameters such as size, shape and slope influence flooding, Areas <br /> <br />that have flooded in the past can be expected to, flood in the future. <br /> <br />Drainage basin boundari~s ,were mapped on the basis of topo- <br /> <br />graphy, using air photos and topographic"maps, The extent of past <br /> <br />floods was mapped from airphoto, evidence, supplemented by h'istoric <br /> <br />~ <br /> <br />~; <br /> <br />and eyewitness reports and maps of surficia~ geology, soils and <br /> <br />topography, <br /> <br />Historic st,ream records on "he Big Thompson" Ca,che la Poui:lre <br /> <br />and South Platte Rivers indicate major floods have occurred several <br /> <br />times in a lifetime, Eye witness. reports on the creeks indicate <br /> <br />that the areas mapped have flooded more than once in a lifetime but <br /> <br />probebly not as often as every ten years. Estimates of the dis- <br /> <br />charges neces'sary to innundate the areas shown on the maps are in <br /> <br />reasonably good agreement 'with bo,th measured and statistically cal- <br /> <br />culated flood 'discharges. The method of mapping past floods pre- <br /> <br />... <br /> <br />sented here has the advantage of being fast and economical. <br /> <br />Signed <br />Faculty <br /> <br />tl;l C~B <br /> <br />member in charge <br /> <br />of thesis <br /> <br /> <br />This abstract is approved as to form and content. <br /> <br />, <br />