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<br />- 21 - <br /> <br /> <br />~ <br />L <br /> <br />Proposed land treatment measures primarily for flood prevention <br />are limited to providing fire protection and control to the private <br />forest and brush lands and adjacent grasslands. This will have <br />direct benefits, both on-site and off-site, to the owners, the community, <br />and to downstream areas due to control of the runoff and sediment <br />production potential of these lands through maintenance and <br />improvement of the vegetative cover made possible by fire protection <br />and control, <br /> <br />The land use and crop distribution of the floodplain was mapped <br />on aerial photographs (scale, 8 inches equal 1 mile) during the <br />economic and sedimentation investigations, <br /> <br />f <br />J <br />I <br />I <br /> <br />. <br /> <br />Information on soils was based on a soils map of the watershed <br />prepared by the Soil Conservation Service, checked by a soil <br />specialist, and approved for use by the state Soil Scientist. Range <br />condition class determinations were based upon previous available <br />survey information and recent field surveys by the Soil Conservation <br />Service. <br /> <br />Hydraulic and Hydrologic Investigations <br /> <br />Hydrologic investigations furnished physical data for calculating <br />the average annual damages and for determining the average annual <br />benefits resulting from the combination of land treatment and <br />structural measures, These data were also used in the design of <br />the proposed structures. <br /> <br />;\ <br />, <br />. <br /> <br />The amounts and frequencies of rainfall used in the analysis <br />of the Franktown-Parker Watershed were determined by tabulating <br />and analyzing rainfall data from several Weather Bureau Stations near <br />the Franktown-Parker Watershed, including Denver, These data were <br />compared with data published in Weather Bureau Technical Paper No. 28 <br />and U. S. Department of Agriculture Miscellaneous Publication No. <br />204 by David L. Yarnell. The published Weather Bureau data for the <br />Denver Station was considered more representative of the watershed <br />and was used for evaluations, <br /> <br />i <br />r <br />f, <br /> <br />I <br /> <br />f <br /> <br />Streanl gages located at Franktown and Melvin do not have a long <br />enough period of record and are not supported by adequate rain <br />gage data to be of use in correlating rainfall and peak discharges, <br />