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1996-02-06_REVISION - M1977493 (14)
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1996-02-06_REVISION - M1977493 (14)
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Last modified
6/16/2021 6:27:02 PM
Creation date
9/13/2010 2:29:48 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1977493
IBM Index Class Name
REVISION
Doc Date
2/6/1996
Doc Name
SWMP-III
From
CMC
To
DMG
Type & Sequence
TR7
Email Name
ACS
Media Type
D
Archive
No
Tags
DRMS Re-OCR
Description:
Signifies Re-OCR Process Performed
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Chapter 4-Site-Specific /nStria/ Storm Water BMPs <br />I What Are They <br />Storm water conveyances such as channels, gutters, drains, and sewers, collect storm water <br />runoff and direct its flow. A group of connecting conveyances is sometimes installed at an <br />industrial facility to create a storm water collection system. Storm water conveyances can be used <br />for two different purposes. The first purpose is to keep uncontaminated storm water from coming <br />in contact with areas of an industrial site where it may become contaminated with pollutants. This <br />can be accomplished by collecting the storm water in a conveyance and by changing the direction <br />of flow away from those areas. The second purpose is to collect and carry the storm water that <br />has already come into contact with industrial areas and become contaminated to a treatment <br />facility. <br />Storm water conveyances can be constructed or lined with many different materials, including <br />concrete, clay tiles, asphalt, plastics, metals, riprap, compacted soils, and vegetation. The type of <br />material used depends on the use of the conveyance. These conveyances can be temporary or <br />permanent. <br />I When and Where to Use Them <br />• <br />Storm water conveyances work well at most industrial sites. Storm water can be directed away <br />from industrial areas by collecting it in channels or drains before it reaches the areas. In addition, <br />conveyances can be used to collect storm water downhill from industrial areas and keep it separate <br />from runoff that has not been in contact with those areas. When potentially contaminated storm <br />water is collected in a conveyance like this, it can be directed to a treatment facility on the site if <br />necessary. (if a pollutant is spilled, it should not be allowed to enter a storm water conveyance or <br />drain system.) <br />What to Consider <br />In planning for storm water conveyances, consider the amount and speed of the typical storm <br />water runoff. Also, consider the patterns in which the storm water drains so that the channels <br />may be located to collect the most flow and can be built to handle the amount of water they will <br />receive. When deciding on the type of material for the conveyance, consider the resistance of the <br />material, its durability, and compatibility with any pollutants it may carry. <br />Conveyance systems are most easily installed when a facility is first being constructed. Use of <br />existing grades will decrease costs. Grades should be positive to allow for the continued <br />movement of the runoff through the conveyance system; however, grades should not create an <br />increase in velocity that causes an increase in erosion (this will also depend upon what materials <br />the conveyance is lined with and the types of outlet controls that are provided). <br />Ideally, storm water conveyances should be inspected to remove debris within 24 hours of rainfall, <br />or daily during periods of prolonged rainfall, since heavy storms may clog or damage them. It is <br />important to repair damages to these structures as soon as possible. <br />4-4
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