My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
CCP 02-10-1992
ArdenHills
>
Administration
>
City Council
>
City Council Packets
>
1990-1999
>
1992
>
CCP 02-10-1992
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
5/8/2007 1:08:46 PM
Creation date
11/3/2006 3:53:29 PM
Metadata
Fields
Template:
General (2)
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
164
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 />I <br />.. The wetland preservation area currently acts as a storm water detention <br />I basin. It was not designed for the purpose of storing runoff. because this <br /> area is not sized adequately to detain 1.8 acre feet of runoff from the 100 <br />I year 24 hour storm. Therefore. an overflow must be provided to prevent the <br />I pond level from increasing to an elevation of approximately 973.0 which is <br /> the level at which the water floods the surrounding property. <br />I The outlet from the pond serving the drainage area. which is approximately <br />I 6.8 acres, will be a 24 inch diameter reinforced concrete pipe. This pipe <br /> will convey the peak flow from a 100 year 24 hour storm, equal to 22 cubic <br />I feet per second (cfs). to the pond designated as pond A-7a. By installing a <br />I 24" pipe, the pond elevation will not rise above 972.80 while discharging <br /> the peak flow. The size of the wetland preservation area is not a factor in <br />.. sizing the pipe and determining the elevation of the pond. The 24" RCP <br /> storm sewer requires 3.2 feet of water above the invert of the pipe to <br />I develop full flow in the pipe. <br />I A baffled weir is required by the Rice Creek Watershed District to treat the <br />I increased volume of runoff from a 1 year 24 hour storm that is directed into <br /> the wetland preservation area by removing the solids before outletting the <br />I water into the 24" RCP pipe. The baffled wier forces the debris, leaves and <br />I other suspended solids to settle into the pond. thereby cleaning the runoff <br /> before discharge. The baffled weir for the wetland preservation area is <br />I shown on page 4 of the plans. The baffled weir design will begin to treat <br /> the water in the pond when it rises to elevation 970.2. therefore ponding <br />~. 0.7 feet of water. This water level will eventually drain under the baffled <br /> weir through the rock creating a pond that will be relatively dry. <br />I <br />I <br />
The URL can be used to link to this page
Your browser does not support the video tag.