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. . . 061\8 Therefore, the scope of the investigations for this report includes that portion of Purgatoire watershed above the mouth of San ~rancisco Creek, about river mile 122, and more particularly the city of Trinidad, Colorado, and vicinity. (See index map inside back cover.) 5. To determine the most suitable plan to provide flood protection for the city of ~r'ir!idad and at the same time make more water available for agricultural and industrial uses, investigations for this report in- cluded reconnaissance surveys, instrumental surveys, and foundation in- vestigations at the proposed project sites; property appraisals, deter- mination of the flood plain; flood damage surveys; and detailed office analyses of all field data obtained. 6. All maps and aerial photographs available from other Governmental agencies and private interests were utilized when practicable. Where suitable maps were not available, topographic maps were prepared from field surveys. Aerial photographs were used extensively in delineation of flood plains, for locating cultural features, and in the revision of out-of-date maps. 7. Flood plains were delineated qy reference to maximum high water marks which could be reliably identified for floods of record. Water surface profiles were computed for hypothetical floods to evaluate the effectiveness of improvements considered. 8. Core borings were made at the Trinidad dam site. Borrow areas were sampled for laboratory analysis to determine the suitability of materials for construction purposes. 9. Economic surveys were conducted to evaluate and classify all physical property in the flood plains. Damages resulting from recent floods were inventoried. Damages from earlier floods and for hypothet- ical floods were estimated by field appraisals of property and improve- ments, based on the computed depths of inundation for the corresponding discharges. 3 ,,;,.'- .