|
<br />- 2 -
<br />
<br />,iatershed Problems
<br />
<br />The principal watershed problem involves control of runoff,
<br />which causes significant floodwater, sediment, and erosion damages
<br />to crops, roads, bridges, fences, and floodplain lands,
<br />
<br />~/
<br />f
<br />.
<br />,
<br />~
<br />
<br />Land Treatment for Watershed Protection and Flood Prevention
<br />
<br /><
<br />;
<br />i
<br />i
<br />l
<br />
<br />.
<br />
<br />The cost of land treatment measures applied to date in the
<br />watershed is J810,482, Additional land treatment to be installed as
<br />part of the watershed program will include the accelerated application
<br />of measures to reduce floodwater runoff and sediment production on
<br />watershed lands and will consist of such measures as land leveling,
<br />pasture planting, improved water application, stripcropping, gradient
<br />terraces, grassed waterways, grade stabilizing structures, woodland
<br />management, and \vildlife area plantings, To protect the timber,
<br />grazing lands, and the farm improvements, additional funds will be
<br />provided to increase the level of fire protection and control on the
<br />private forest and brush lands in the area,
<br />
<br />
<br />The total installation cost of these additional land treatment
<br />measures on non-Federal lands is estioat2d at $359,479, of which
<br />$34,190 will be Federal (Public La,,, 566) cost for technical assistance
<br />and increased fire protection and control and $325,289 will be provided
<br />from ~otherU funds.
<br />
<br />".
<br />,\
<br />
<br />Structural Measures for Flood Prevention
<br />
<br />i;
<br />t
<br />
<br />The structural measures included in the plan consist of 16
<br />floodwater-retarding structures, 8 combination grade stabilization
<br />and floodwater-retarding structures, and 1 diversion channel, The
<br />ccmlbined capacity of the retarding structures is 4,470 acre-feet,
<br />Of this capacity, 3,427 acre-feet is allotted to floodwater-retarding
<br />storage and 1,043 acre-feet to sediment storage (Table 3), The total
<br />cost of these measures is $820,859, of which the Public Law 566 share
<br />is :rli778,460 and the local or "other" share is $42,399, The structural
<br />measures will be designed and constructed in compliance with State
<br />of Colorado policies and regulations,
<br />
<br />,-,'"
<br />~
<br />
<br />i
<br />\;
<br />~;
<br />~
<br />
<br />.,
<br />
<br />.f
<br />
<br />I
<br />
<br />~
<br />
<br />~,
<br /><~
<br />II
<br />,il
<br />..:-,~
<br />,~
<br />..~
<br />
<br />Damages and Benefits
<br />
<br />Average annual damages are estimated at $88,393 without the
<br />project and $37,109 with the project (Table 7), The average annual
<br />benefits (damage reductions) from land treatment measures for
<br />watershed protection are estimated at $3,224, The average annual
<br />benefits accruing to structural measures are estimated at $48,060
<br />and are distributed as fol1ows:
<br />
<br />{!:~
<br />
<br />Floodwater damage reduction
<br />Sediment damage reduction
<br />Erosion damage reduction
<br />Indirect damage reduction
<br />Total damage reduction
<br />
<br />Dollars
<br />$15,976
<br />Z14,412
<br />$16,074
<br />j~ 1,598
<br />$48,060
<br />
<br />Per Cent
<br />--
<br />33,2
<br />30,0
<br />33,5
<br />3,3
<br />100,0
<br />
|