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HYDRO27271
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HYDRO27271
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Last modified
8/24/2016 8:46:37 PM
Creation date
11/20/2007 7:48:47 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981017
IBM Index Class Name
Hydrology
Doc Date
11/9/2007
Doc Name
Coal Basin Watershed Non-Point Grant-Final Report
From
DRMS
To
WQCD
Permit Index Doc Type
Correspondence
Media Type
D
Archive
No
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methods of stabilization have been discussed earlier in this report. The results of these <br />efforts are presented in Tables 3, 4 and 5. <br />The data tables indicate that the relative volume of sediment generated from the mine <br />bench outslopes has been reduced as a result of the project activities. A relatively greater <br />degree of success was attained from the 2004 revegetation project than what was realized <br />from the 1999 effort. In part, this was due to the lack of vegetative success in 1999 as a <br />result of the regional drought experienced in the area. Some degree of a lesser <br />germination potential can also be attributed to the loss of mulch cover in the fall of 1999. <br />The greater success of the 2004 effort can be attributed to a more typical weather pattern, <br />which allowed for greater moisture availability and a resultant increase in germination <br />potential. The use of a tackifier to hold the mulch onto the slopes was a significant <br />change in the scope of the project when compared to the 1999 work. Securing the mulch <br />to the outslope surface aided greatly in shading the seed, retaining moisture on the slopes <br />and adding organic material to the slopes. <br />Another significant factor in reducing sediment generation following the 2004 project <br />were the steps taken to disperse the contributory flows to the slopes from upland areas. <br />Manipulation of contributing flows, creating a more dispersed flow pattern through the <br />use of straw wattles and intensive tree planting, helped to reduce gully activity, reduce <br />water velocities and increase slope stability. This influence can be observed at the Mine <br />5 Fan site. The sediment yield model shows that sediment generation decreased, albeit <br />slightly, following the 2004 work, even though a significant ground cover was not <br />established at the site. Therefore, the decrease in sediment is attributable to water in-put <br />manipulation at the crest of the outslope. <br />The mid-slope tree band plot established at Mine 1 East in 2000 was successful. <br />Approximately sixty to seventy percent of the trees survived. The root systems of the <br />trees should act to hold relatively neaz surface particles in place, while the stems will tend <br />to help disrupt surface flows, resulting in decreased flow velocity and reduced gully <br />development while encouraging stabilization of existing gullies. As they mature, the <br />trees may also help to establish an understory vegetative community by providing shade <br />to the slopes, and a somewhat shallower slope angle at the tree band locations. For these <br />reasons the tree banding was replicated at most of the outslopes, and at multiple <br />elevations at each outslope. <br />The shrub and willow plantings that were incorporated into the 2000 tree planting test <br />plot on the Mine 1 East outslope were much less successful than the tree planting work. <br />Virtually none of the shrubs and willows survived for an appreciable length of time at the <br />locations planted. It is likely that the willows failed simply as a result of a lack of <br />available moisture. The shrubs lack of survival may also be partially attributable to a <br />lack of moisture, but it is thought that at Mine 1 East "soil" shear of the plant stem may <br />have played a significant role in plant mortality. Neaz surface particle movement was <br />observed to occur in this location. The shearing movement of outslope particles across <br />the relatively fragile shrub stems may have resulted in the lack of appreciable survival <br />14 <br />
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