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REV105317
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REV105317
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Entry Properties
Last modified
8/25/2016 1:16:58 AM
Creation date
11/22/2007 1:25:23 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981021
IBM Index Class Name
Revision
Doc Date
1/13/1988
From
FLATIRON WALDEN COAL CO
To
MLR
Type & Sequence
PR1
Media Type
D
Archive
No
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2 <br />5) diverting nmoff using protected channQls or pipes through di_Sturbed <br />areas so as not to cause additional erosion; <br />6) using straw dikes, riprap, check dams, mulches, vegetative cor3ima.,t <br />filters, dugout potds, and other maac,,.ra that reduce overland flow <br />velocity, reduce runoff wlume, or trap ~;~**, <br />~ 'II~e•.~e regulations give the basis anti need for alternative sediment controls; <br />all eoriinwr,t controls otl]er than caAimanf~ ppnyq, gy ,,,~wr;,~ the r,~,i ramonts of <br />the regulations, the basis for alternatives i,,,P.,r controls becomes apparent. <br />'Ihe need for alternative cxlimor,r controls 1S appropriate given Colorado's unique <br />j topography and climatic conditions. <br />1 'The design of sediment. control measures and structures should be a design <br />which has a high rate of sediment removal and a reasonable cc~t. Obviously, <br />1 evaluating the performance and cyst of every possible treatment for a site is not <br />practical. Some structures control certain physical processes while other <br />maw~,rp_a control other processes. By wing the .importance of different <br />physical processes, a guide to selecting sediment control treatments can be <br />developed. <br />First, the largest source of sediment supply in small areas results frc~ <br />ra; *+~~+ detac2~ent. Only one etvsion oontml grwp acts to mntml this supply, <br />an`I that is the surface protection measures (i.e. mulches, r+evegetation) . 'IY~ese <br />mPac„rwc o~trol both the supply of large and fine sedir+p*+*G, whereas the other <br />omztrol measures have limited ability to ootrtxol fine sediment. If a soil <br />contains a large anoint of fine material (specifically silt and very fine sand), <br />surface protection +~+~~~+~*~ will be the most effective means of controlling <br />seduoent. <br />Methods which reduce the amount of nmoff (surface protection and TM~+an;cal <br />treatment) will control the transport of sediment from the slope. These methods <br />will reduce the wlume of erosion. When cxsobine3 with a method which protec.~ts <br />I <br />I• <br />
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