My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
GENERAL54754
DRMS
>
Back File Migration
>
General Documents
>
GENERAL54754
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
8/24/2016 8:39:55 PM
Creation date
11/23/2007 9:46:57 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981037
IBM Index Class Name
General Documents
Doc Date
9/9/1993
Doc Name
MEMO GEC WEST PIT CHANNEL WORK
From
DMG
To
ERICA CROSBY LARRY ROUTTEN
Permit Index Doc Type
GENERAL CORRESPONDENCE
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.
/
2
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 />III IIIIIIIIIIIII III <br />999 <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman 51.. Room 215 <br />Denver, CO 80203 <br />Phone: 13031 866-3567 <br />FAX: (303) 8328106 <br />DATE: September 9, 1993 <br />TO: Erica Crosby <br />Larry Routten <br />FROM: David Berry <br />RE: GEC/West Pit Channel Work <br />pF tOyp <br />~~ b <br />~~ / <br />0 <br />• ~ r8T6 ~' <br />Roy Romer <br />Governor <br />Michael B. Long <br />Division Director <br />I have reviewed the survey information given to me today, for the channel <br />transition areas located near the West Pit sediment pond. Specifically, I have <br />proposed a design for the anticipated channel junction which will result when the <br />native channel to the west of the West Pit is joined with the West Pit channel <br />above the currently existing pond. The same design applies to the transition area <br />located between the current pond location and the Magpie Diversion. <br />I have designed these sections for an estimated 100 year, 24 hour peak flow of <br />approximately 150 cubic feet per second (cfs1. This was derived using the STORM <br />program, with the following input numbers: <br />Precip = 3.8 inches <br />Avg. CN = 73 <br />Acreage = 443 (Rockvale Quad) <br />Length of basin = 12,530 ft. <br />Change in elevation= 1,500 ft. <br />This should be a conservative estimate of the peak flow. <br />Riprap is recommended at both transition areas, for total lengths of about 100 feet <br />at the top area, and about 175 feet at the Magpie transition area. <br />Channel and riprap calculations were estimated using the Oklahoma Technical <br />Press and SEDCAD programs. <br />
The URL can be used to link to this page
Your browser does not support the video tag.