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<br /> <br />The increased costs to the county for road maintenance due <br />to deposition of sediment and road erosion. <br /> <br />Ponds prematurely lose their effectiveness due to <br />excessive sedimentation. <br /> <br />Wildlife habitat deterioration due to erosion and <br />sedimentation. <br /> <br />A decreasing quality of life. <br /> <br />Analysis of the watershed identified a change in operating <br />unit size as you go from the bottom to the top. Those units in <br />the upper portion of the watershed were generally less than 160 <br />acres in size. The majority of this area is composed of <br />grazeable woodlands. Approximately 51 percent of the sheet and <br />rill erosion is attributable to the 82,930 acres found in this <br />portion of the watershed. Nineteen percent of the gully and road <br />erosion occurs in this region, whic h comprises 75 percent of the <br />project's area. <br /> <br />The lower portion of the watershed is predominantly <br />operating units larger than 160 acres. This area is composed <br />primarily of rangeland. This portion of watershed is <br />approximately 28,200 acres in size, or 25 percent of the <br />watershed area. Approximately 49 percent of the sheet and rill <br />erosion and 81 percent of the gully and road erosion occurs in <br />this portion of the watershed. Sluffing banks in gullied areas <br />are receding at a rate of approximately 0.2 foot per year. <br /> <br />EROSION AND SEDIMENT DELIVERY SUMMARY <br />Trinidad Lake North Watershed <br /> <br /> Sediment <br /> Delivery Sediment reaching <br /> Erosion 1/ Ratio Trinidad Lake 2/ <br /> Tons Ac. Percent Tons Ac. Ft. <br /> Ft. <br />Sheet & Rill 134,400 69 70 94,100 62 <br />Gully 134,300 68 80 107,400 70 <br />Roads 64.700 --2.d 80 51.700 -24. <br /> Totals 333,400 170 253,200 166 <br />1/ For Erosion - tons of soil loss was c.onverted to Ac. Ft. <br />using as factor of 1960 tons/Ac. Ft. <br /> <br />2/ For Sediment reaching Trinidad Lake - tons of sediment was <br />converted to Ac. Ft. using a factor of 1525 tons/Ac. Ft. <br /> <br />14 <br />