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<br /> <br />- 9 - <br /> <br /> <br />OC2195 <br /> <br />WORKS OF IMPROVEMENT TO BE INSTALLED <br /> <br />Land Treatment Measures for Watershed Protection <br /> <br />Emphasis will be placed on accelerating the establishment of <br />land treatment measures that will aid in the reduction of floodwater, <br />erosion, and sediment damages. The quantities of land treatment to <br />be installed by the owners and operators and the estimated costs are <br />shown in Table 1. <br /> <br />Land treatment measures to be applied on the rangeland will <br />include proper range use, pasture planting, farm ponds, and grade <br />stabilization structures. Proper use will assure improvement, <br />protection, and maintenance of grass stands. Pasture planting <br />will function primarily to increase infiltration and to control <br />erosion. The construction of farm ponds will assure more uniform <br />grazing by reducing livestock concentrations that destroy plant <br />cover. Grade stabilization structures will reduce loss of land <br />from gully erosion. <br /> <br />Structural Measures for Flood Prevention <br /> <br />This work plan proposes the installation of two floodwater- <br />retarding structures, 2,000 lineal feet of diversion, and 1,234 <br />lineal feet of stream channel improvement at an estimated installation <br />cost of $265,403. The estimated construction cost (Public Law 566) <br />is $197,864. Data concerning the proposed structures are summarized <br />in Tables 2, 3, 3A, and 3B, and their location is shown on Figure 2. <br /> <br />~tructures FPC-l and FPC-2 are class "c" 1/ floodwater-retarding <br />structures and will control runoff from 1.48 square miles or 64 per <br />cent of the watershed. The floodwater storage capacity in each <br />reservoir is four inches of runoff from the area controlled. This <br />provides regulation of storms with a recurrence interval greater <br />than a lOO-year period. <br /> <br />The two floodwater-retarding structures will have a combined <br />storage capacity of 363 acre-feet, with 316 acre-feet for floodwater <br />storage and 47 acre-feet for sediment storage. The structures will <br />be of compacted moisture-controlled earth construction and will be <br />fenced and seeded. They will have ungated principal spillways of <br />reinforced concrete pipe. The emergency spillways will be <br />excavated in earth. <br /> <br />1I <br /> <br />As defined in Engineering Memorandum SCS-27, Page 1, dated <br />March 14, 1958. <br />