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Installation costs for these practices range between $35.00 to create resistance to sliding or shear displacement in a streambank
<br /> ' $55.00 per linear foot. These techniques were installed in urban as they develop roots or fibrous inclusions.
<br /> areas to protect backyards from sloughing off into major tributaries
<br /> of Lake Decatur. Because of the expense involved, it is Examples of bioengineered systems include:
<br /> recommended that only urbanizing areas or existing urban areas • brushmattresses � joint plantings • branchpacking
<br /> where the land values exceed the cost of stabilization be • live stakes • vegetated geogrids • live fascines
<br /> considered for the use of these techniques.
<br /> Many sites require some earthwork before bioengineered systems
<br /> Although peak stone was used to stabilize stream banks, other are installed. A steep or undercutting bank should be graded to a
<br /> alternatives exist to control erosion. 3:1 slope and the toe of slopes stabilized with peak stone to protect
<br /> the plantings from washing out. The attached diagram is an
<br /> As shown in the graphic below, the total annual sediment yield to example of a bioengineered system that can be installed in Sand
<br /> Lake Decatur is 7,339 tons, or 10, 873 cubic yards. This total Creek.
<br /> corresponds to the 1995 total of 7,100 tons (10,519 cu.yd.) of
<br /> sediment delivered to Lake Decatur. Ephemeral and gully erosion ��a�a�
<br /> rates were measured in the field for the 1999 study. In most cases, �.����� �
<br /> treatment for ephemeral erosion will restore fields to the desired , � 5t��,,,,�,�
<br /> resource management system level needed to address ° �'
<br /> sedimentation concerns, make fields more efficient for farming, � 2to"ee1 ��;
<br /> and improve wildlife habitat for nesting birds. "e"`
<br /> �' oc.arr�
<br /> �e
<br /> Erosion Rates Per Class � �
<br /> Tons x SDR 'Y
<br /> in 1 h�[
<br /> '.io-eam[armingrbw '-�� �.' _ (muµviarfpacin�
<br /> Sheet 8� Rill (Cropland ) 16,103 x .25 = 4,026 ---� V
<br /> Ephemeral 3937 x .35 = 1,378 ���,,. ' �
<br /> � � tJve mning
<br /> Gully 580 x .75 = 435 ����=�������n�.
<br /> Streambank 1,700 x .90 = 1,500 "��d� s T°�a�°�°�°^
<br /> Vcac
<br /> � RmtrUlealed mnmtinn nf iAe Irving
<br /> C�ot�xnlr[abnc plan�rtia�pnal ic nnt ra�re9m�ative�f
<br /> Annual total sediment yield to Lake Decatur: - �,P�„P��N,,,,,,��,.
<br /> 7,339 TONS (10,873 CU. YD.)
<br /> Note: 50 Ibs. soil per cu.yd.
<br /> Additional information can be found in NRCS's Engineering Field
<br /> Manual- Chapter 16- Streambank and Shoreline Protection.
<br /> * Estimated Cost of Terraces *
<br /> Earthwork.......... 14,200 ft. @ $1.62/ft. _$23,004.00
<br /> Tile .................... 13,000 ft. @ $1.45/ft. _$18,850.00 CQ�S E��V/,T�0�
<br /> Inlets...................... 25 no @ $200/inlet =$ 5,000.00
<br /> Outlets................. 25 no @ $200/outfet =$ 5,000.00 ��OG��:��5
<br /> Sub-total: $51,854.00
<br /> Many of the BMPs suggested in the resource plan can be funded
<br /> * Estimated Cost of WASCOBS * in part by Federal, State, and local programs. These BMPs
<br /> Earthwork....... $3,000 practices include grassed waterways,grade stabilization structures
<br /> Tile/Inlet.......... 1 500 at waterway outlets,and filter strips.The BMPs can be cost-shared
<br /> Total $4,500 each @ 16 no.= $72,000.00 for 50%of the installation costs plus a 10-year soil rental rate which
<br /> ranges from $131 to $177 per acre by participating in the
<br /> ** Total Costs ** Conservation Reserve Program (CRP). In addition, a property
<br /> tax re-evaluation can be performed,which may result in a property
<br /> Terraces ........................$51,854.00 tax rate that is 1/6th the original tax rate. This option can be pursued
<br /> WASCOBS....................$72.000.00 by notifying the County Assessors office that these practices have
<br /> Total: $123,854.00 been applied, and that the land has been taken out of crop
<br /> production for conservation use.
<br /> All these features make CRP an attractive conservation program
<br /> Al.Tf���AT I Vf �I EASL�IZ-E S that can effectively benefit both the producers and the environment.
<br /> As previously stated, 10 tracts of farmland inventoried(750 acres)
<br /> FO�� ST��_EA��A 11 K S are eroding 1.5 times above T (7 tons). Because of the inherent
<br /> � erodibility of these soils, simple changes in tillage methods, such
<br /> as strip-till, will be necessary to control sheet and ephemeral
<br /> Soil bioengineering systems erosion when used in conjunction with structural measures such
<br /> as terraces and water and sediment control basins,or WASCOBS.
<br /> Soil bioengineering is a system of living plant materials used as
<br /> structural components. Adapted types ofwoody vegetation(shrubs Based on the assumption that 10 tracts of farmland in the
<br />� and trees) are initially installed in specified configurations that watershed are in need of $123,854 in structural measures,
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