My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
CCP 09-10-2001
ArdenHills
>
Administration
>
City Council
>
City Council Packets
>
2000-2009
>
2001
>
CCP 09-10-2001
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
5/8/2007 1:23:52 PM
Creation date
11/13/2006 2:37:16 PM
Metadata
Fields
Template:
General (2)
Jump to thumbnail
< previous set
next set >
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
390
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 /> <br />6.12 <br /> <br />Chapter 6: Infiltration Basins <br /> <br />~ <br /> <br />Depth to'Seasonally High Water Table <br /> <br />A minimum of two to four feet of clearance is needed between the floor of <br />the basin and the seasonally high water table. This depth can be nadily <br />determined from soil borings taken during wet weather. High water tables <br />often present a majox;. obstacle to the use of infiltration basins, since <br />basins are usually locat.ed in depressions at the low end of a watershed where <br />local water tables are located near the the ground surface. <br /> <br />I <br /> <br />I <br /> <br />Proximity to Wells and Foundations <br /> <br />I <br /> <br />Basins should be located at least 100 feet away from drinking water wells <br />to minimize the possibility of groundwater contamination, and should be <br />situated at least 10 feet down-gradient and 100 feet up-gradient from <br />building foundations to avoid potential seepage problems. <br /> <br />I <br /> <br />Maximum Depth of Reservoir <br /> <br />To insure that the basin completely drains within 72 hours, it may be <br />necessary to limit the depth of the basin if underlying soils have relatively <br />low exfiltration rates. Recommended depth limits for basins are shown for <br />various soil textures in Table 6.2. . <br /> <br />I <br /> <br />Watershed Size <br /> <br />I <br /> <br />Md WRA (1983b) suggests that basins can be applied to sites ranging from 5 <br />. to 50 acres in size. Other BMPs t such as extended detention ponds and wet <br />ponds, are better candidates on larger sites as they are more capable of <br />handling sustained basefloW'. <br /> <br />II <br />I <br /> <br />Table 6.2: Soil Limitations For Infiltration Basins <br /> <br />A <br /> <br />MAXH1UM DEPTH OF' <br />STORAGE (inches) <br />48 hrs 72 hrs <br />397 595 <br />116 174 <br />49 73 <br />25 37 <br />13 19 <br /> <br />I <br /> <br /> MINIMUM INFIL- <br />SOIL TRATION RATE <br />TIl'E (fcninches(hr) <br />Sand 8.27 <br />Loamy Sand 2.41 <br />Sandy Loam 1.02 <br />Loam 0.52 <br />SUt Loam 0.27 <br /> <br />SCS SOIL' <br />GROUP <br /> <br />I <br /> <br />A <br /> <br />I <br /> <br />B <br /> <br />I <br /> <br />B <br /> <br />C <br /> <br />I <br /> <br />Sandy Clay Loams, Clay Loams, Silty Clay Loams, Sandy Clay, Silty <br />Clay,and Clay Soils are not included as these soil types are all <br />NOT FEASIBLE for infiltration basins. <br /> <br />I <br />.. <br /> <br />2 Maximum Depth in the Basin that can drain completely within 48 or <br />72 hours after a storm. given the soil infiltration rate. <br /> <br />I <br />
The URL can be used to link to this page
Your browser does not support the video tag.