ADS StormTech DC-780, Design Manual

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860.529.8188

 or 

888.892.2694

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 for technical and product information.

24

7.0 Inletting the Chambers

Figure 8 – StormTech Isolator Row Detail

filter fabric prevents sediments from migrating out of the 
chamber perforations while allowing modest amounts of 
water to flow out of the Isolator Row. 

Figure 8

 is a detail 

of the Isolator Row that shows proper application of the 

geotextiles. Contact StormTech for a table of acceptable 
geotextiles. 

7.4 ENHANCED TREATMENT (BMP) – TREATMENT TIER 3

As regulations have become more stringent, requiring 
higher levels of containment removal, water quality 
systems may be required to treat higher flow rates, 
greater volumes or to provide a higher level of filtration 

or other more sophisticated treatment process. 

StormTech systems can easily be configured with 
enhanced treatment techniques located either upstream 
or downstream of the retention or detention chamber 
system. Located upstream of an infiltration bed, between 
the pretreatment device and the Isolator Row, enhanced 

treatment provides a high level of contaminant removal 

which protects groundwater or better preserves the 
infiltration surface. Located downstream of detention, 

enhanced treatment provides a higher level of 
contaminant removal prior to discharge to a receiving 

body.

Enhanced treatment BMPs are normally applied where 
specific regulations and specific water quality product 

approvals are in place. StormTech works closely with 
providers of enhanced treatment technologies to meet 

local requirements.

7.5 TREATMENT TRAIN CONCLUSION

The treatment train is a highly effective water-quality 
approach that may not add significant cost to a StormTech 
system being installed under commercial parking areas. 
The StormTech Isolator Row adds a significant level 
of treatment, easy inspection and maintenance, while 

maintaining storage volume credit for the cost of a 

modest amount of geotextile. Finally where higher levels 
of treatment are required, StormTech can integrate other 

technologies into the treatment train to provide the most 
cost effective treatment approach. This treatment train 

concept provides three levels of treatment, inspection and 

maintenance upstream and downstream of the StormTech 

detention/retention bed.

Inspection is easily accomplished through the upstream 
manhole or optional inspection ports. Maintenance of an 
Isolator Row is fast and easy using the JetVac process 

through the upstream manhole. Section 12.0 explains the 

inspection and maintenance process in more detail. 

Isolator Rows can be sized to accommodate either 
a water quality volume or a water quality flow rate 
requirement. The use of filter fabric around the Isolator 
Row chambers allows stormwater to egress out of the row 
during and between storm events. The rate of egression 
for design is dependent upon the chamber model and 
sediment accumulation on the geotextile. Contact 

StormTech’s Technical Services Department for more 
information on Isolator Row sizing.

SC-160LP - 8" (200 mm) HDPE ACCESS PIPE

SC-160LP - 3' (1.0m) MIN WIDE

Note: 

Non-woven geotextile over DC-780 Isolator Row chambers is not required.