My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
REV00711
DRMS
>
Back File Migration
>
Revision
>
REV00711
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
8/25/2016 12:58:23 AM
Creation date
11/21/2007 8:47:41 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981019
IBM Index Class Name
Revision
Doc Date
6/3/1995
Doc Name
COLOWYO COAL MINE C-81-019 US ARMY CORPS OF ENGINEERS LETTER
From
DMG
To
COLOWYO COAL CO LP
Type & Sequence
PR1
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.
/
5
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
Results of Modeling: <br />Colowvo's Modeling Of Prospect Pond - 4-16-92 <br />Model based upon a simple composite curve number of 63 used <br />throughout the demonstration. (Members of the hydrology staff who <br />reviewed Juan Garcia's "Curve Number Justification" failed to agree <br />with many of the justifications given) Worse case was based on the <br />assumption that a pit or pits would be in place to detain much of <br />the runoff from reaching the South Collection Ditch or Prospect <br />Pond. Times of concentration were improperly determined resulting <br />in reduced velocities. <br />Results for a 10 year, 24 hour event: <br />4.5 acre feet total volume reaching the Prospect Pond <br />.2 efa peak discharge <br />Division's Modeling of Prospect Pond - 4-28-92 <br />Model based upon curve numbers of 87 and 49 for unvegetated and <br />undisturbed lands, respectively. Worse case was based on the <br />assumption that the section 16 pit would be closed and undergoing <br />reclamation. <br />Results for a 10 year, 24 hour event: <br />22 acre feet total volume reaching the Prospect Pond <br />174 cfa peak discharge <br />Colowvo's Modeling of Prospect Pond - 12-14-92 <br />Model based upon a more precise delineation for curve numbers, <br />however, the curve numbers used did not agree the with curve <br />numbers agreed upon fn a meeting with the Division (eq, newly <br />topsoiled and planted areas were given a curve number of 49) . <br />Worse case was based upon the assumption that the Section 16 pit <br />would be in place to keep much of the runoff from reaching the <br />South Collection Ditch or Prospect Pond. Times of concentration <br />were properly calculated. <br />Results for a 10 year, 24 hour event: <br />.2 acre feet total volume reaching the Prospect Pond <br />1 cfs peak discharge <br />Channel velocities of 6 - 12 fps <br />
The URL can be used to link to this page
Your browser does not support the video tag.