My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
PERMFILE44342
DRMS
>
Back File Migration
>
Permit File
>
500000
>
PERMFILE44342
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
8/24/2016 10:46:47 PM
Creation date
11/20/2007 11:53:44 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1999002
IBM Index Class Name
Permit File
Doc Date
1/21/1999
Doc Name
PERMIT APPLICATION DRAFT SOIL CONSERVATION EROSION AND SEDIMENT CONTROL RECLAMATION AND REVEGETATION
Section_Exhibit Name
Appendices A-E
Media Type
D
Archive
No
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
53
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
View images
View plain text
<br />' BEST MANAGEMENT PRACTICES OVERVIEW <br />Maintaining or establishing surface hydrologic stability is a critical component in the mining <br />and reclamation process. Adequately controlling erosion and minimizing sediment transpoR <br />serves to prevent or minimize unpacts to receiving waters, and supports and enhances the long- <br />tenn stability of reclaimed areas. There are a variety BMPs that may be employed to <br />accomplish these goals during development, operation and reclamation of the project. BMPs <br />may be used independently or in combination to accomplish erosion and sediment control <br />objectives. While serving a common purpose there are distinct applications to which BMPs are <br />best suited. <br />Erosion and sediment control requires the use of specific BMPs that address different physical <br />conditions than those associated with channel reconstruction. Generally, surface sheet flow <br />' control practices vary physically from those used to control concentrated surface flows because <br />of the differences rn environmental conditions and requirements. Selecting a single or <br />combination of BMPs for use on a site must take into consideration the variety of flow <br />conditions that may occur there. Often there isn't a correct solution, but rather a variety of <br />combinations that may accomplish erosion and sediment control objectives for a given location. <br />Typically, complex flows requu~e more sophisticated structures and practices than less complex <br />flows. <br />BMPs have been grouped in these appendices based on their primary uses or applications. <br />While the use of some of them may be limited to the category in which they are placed, many <br />' of them present useful applications in multiple categories. Typical installations for BMPs are <br />provided for clarity. The practice of routinely prescnbing controls for erosion and <br />sedimentation problems will be avoided. Each drainage situation will be treated creatively to <br />' minimi~p construction and treatment costs, while striving to ^raximi7r the effectiveness of <br />BMPs. <br />' CONCENTRATED FLOW STRUCTURES <br />Concentrated flow structures are used to carry concentrated surface Flows azound, through or <br />from undisturbed, disturbed, and reclaimed areas and facilities. Berths (Figure 8-1), <br />' diversions (Figure B-2), and reconstructed channels (Figure B-3) are commonly used <br />concentrated flow structures. Diversions may be placed to prevent the comminghng of <br />undisturbed and disturbed runoff and to reduce treatment volumes. Also, undisturbed area <br />runoff may be diverted to reduce the volume that must be routed through concentrated flow <br />structures within reclaimed azeas. Diversions may also result in beneficial use of the diverted <br />flow. Concentrated flow structures may be designed for temporary or permanent uses. Soils <br />data should be analyzed, particularly for erodibliry, when developing specifications for <br />' concentrated flow structures. Concentrated flow structures should be designed by a qualified <br />professional. <br />1 Concentrated Flow structures may take a variety of forms ranging from structures composed <br />entirely of fill materials to those which are completely incised into the ground, or some <br />combination thereof. Various channel configiuations and lining materials may be used to <br />' provide stability for various Flow volumes and velocities. The shape of the channel used to <br />convey runoff may be triangulaz, parabolic or trapezoidal and will be specified to fit the <br />environmental conditions and flow characteristics of the location in which they are used. <br />Structures will be sized and capable of passing the predicted Flows for the type and duration of <br />' use. Permanent and critical structures will be capable of passing larger volumes of runoff than <br />temporary ones. During construction all trees, brush, stumps, obstructions and other <br /> <br />B-1 <br />
The URL can be used to link to this page
Your browser does not support the video tag.