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<br />, <br /> <br />I <br /> <br />C~1759 <br /> <br />- 16 - <br /> <br />I <br /> <br />I <br /> <br />63 <br />32 <br />32 <br /> <br />50 <br />25 <br />25 <br /> <br />,II Floodwater <br />Detention <br />Drain <br />Time-Days <br /> <br />11.0 <br />7,0 <br />6.5 <br /> <br />I <br /> <br />Structure <br />l'lurober <br />L-l <br />1-2 <br />1-3 <br /> <br />Principal Spillway Capacity <br />Reservoir Full Average <br />Max. Release Rate Release Rate <br />c.f.s. c.f.s. <br /> <br />I <br /> <br />I <br /> <br />The improved capacities of the channels downstream from the <br />floodwater-retarding structure sites will be adequate to carry the <br />maximum tube releases of the structures in addition to local inflows <br />from a 100-year frequency storm. The channel below structure 1-1 <br />has a capacity of about 155 cubic feet per second, that below 1-2 <br />about 110 cubic feet per second, and that below 1-3 about 210 <br />cubic feet per second, The capacity of the main stem channel <br />downstream fram the junction of the three tributaries is about 560 <br />cubic feet per second. <br /> <br />I <br /> <br />.' <br /> <br />I <br /> <br />EXPLANATION OF INSTALLATION COSTS <br /> <br />I <br /> <br />Project installation costs are <br />two principal categories of costs: <br />structural measures. <br /> <br />shown in Table 1. There are <br />(1) land treatment, and (2) <br /> <br />I <br /> <br />Land treatment measures will be applied on privately-owned <br />land by the landowners. Technical assistance will be provided <br />by the High Plains Soil Conservation District. These measures <br />when applied for and installed on the land are eligible for cost- <br />sharing under the Agricultural Conservation Program, The unit <br />costs used for these measures are based on current Agricultural <br />Conservation Program and Great Plains Conservation Program costs <br />established for this area, <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />Project installation costs for the structural measures for <br />floodwater-retarding structures include the following costs: <br /> <br />I <br /> <br />Public Law 566 costs.- The structural cost estimates are <br />made for construction of the three flcodwater-retarding structures. <br />The engineering estimate includes: clearing, site preparation, <br />construction of embankments, principal spillways, emergency <br />spillways, seeding and fencing of borrow areas, and the dam and <br />spillway areas. To estimate the construction cost of these <br />structures, 12 percent of the engineering estimate is added for <br />contingencies. <br /> <br />I <br /> <br />I <br /> <br />I <br />