My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
2001-12-11_PERMIT FILE - C1981028A (2)
DRMS
>
Day Forward
>
Permit File
>
Coal
>
C1981028
>
2001-12-11_PERMIT FILE - C1981028A (2)
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
10/20/2017 6:51:49 AM
Creation date
11/26/2007 3:54:05 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981028A
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Section_Exhibit Name
APPENDIX K SURFACE WATER/SEDIMENT CONTROL
Media Type
D
Archive
Yes
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
27
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
t1 r. Neil f,. Jaegnet -2- 19 October 1979 <br />Adolph Coors Company <br />Re: Keenesburg Coal Mine Sediment Pond <br />HYDRAULICS <br />A velocity criteria of 4 feet per second for the 10-year, 30-minute storm was <br />utilized in the design of the drainage ditches. In order to maintain this vel- <br />ocity in channel reaches on the steeper portions of the project site, it was nec- <br />essary to limit the channel invert slope to a maximum 0.5 percent. This was <br />accomplished by utilizing simple drop structures where appropriate. A triangular <br />cross-section was utilized in the design of all drainage ditches. Typical ditch <br />cross-sections and complete profiles are included in the attached drawings. <br />The location of all sediment ponds remains as shown on the drawing which Coors <br />provided, with the exception of Pond 2. Pond 2 was moved approximately 500 feet <br />to the east in order to eliminate the need to elevate the drainage ditch from <br />the east. All sediment ponds average 7 to 8 feet deep. The elevations of the <br />emergency spillways for the ponds were set to provide the required volume below <br />the spillway. Routing of the design peak discharge assumed that the ponds were <br />full to the spillway crest at the beginning of the storm event. This assumption <br />provides a conservative design but is warranted since no low-level outlet is pro- <br />vided for the ponds. Cetained runoff in the ponds will infiltrate into the per- <br />vious soils. A plan view and section view of each pond along with spillway de- <br />tails are included in the enclosed drawings. <br />A two-cell settlino basin has also been designed. The purpose of the settling <br />basin is to receive water pumped from the mine pits. Details of the settling <br />basin are included in the enclosed drawings. <br />IJe are please to provide this preliminary design service for the Adolph Coors <br />Company. The engineering work is necessarily of a preliminary nature, and <br />`~ <br />
The URL can be used to link to this page
Your browser does not support the video tag.