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Details-Performance

The following table offers a guideline of anticipated capacities for various Nutrient Separating Baffle Box configurations, all H20 load capable. Each NSBB is custom designed and fabricated for location-specific storm drain conditions. Accordingly, capacities will vary per the design requirements. Models are designated by their internal dimensions, i.e., width in feet x length in feet x height in inches.  Many additional models are available via alterations in length or height, e.g., 8-12-96 provides an NSBB having an internal length of 12' and height of 96".

General Performance Information 

NSBB
Model
&
Internal
Size1,2,3
W x L x H
[ft x ft x in]

Typical
Pipe
Sizes
[in]

Peak
Treatment
Flow4
[cfs]

Peak
Treatment
Flow5 @
80% TSS
Reduction
Efficiency
[cfs]

Basket
 Storage
Capacity
[cf]

Sediment
Chamber
Storage
Capacity
[cf]

Total
Contaminant
Storage
Capacity
[cf]

Storm
Boom
Liquid
Organic
Storage
Capacity6
[gal]

Spill
Liquid
Organic
Storage
Capacity7
[gal]

2-4-60

 4-12

 3 

 1 

 2.7 

15.3 

18

0.6

  20 

3-6-84

 8-18

6 

3

11.5

54

 65

1.0

 80

4-8-84

 12-18

 12 

 8 

 20

92

 112

1.4

  100 

5-10-84

 12-30

 30 

 15 

 49

  148 

 197

1.9

 330

6-12-84

 18-36

 46 

 24 

 72

 204

 276

2.4

 480

8-14-100

 30-54

60 

 32 

 109

 355

 464

 6.8 

 730

8-16-108

36-54

75

40

 109

 355

 464

 6.8 

 730

10-16-108

 42-66

 100 

45

  236 

  570 

806

 8.8 

  1000 

12-20-132

 54-72

 125

55 

 419

 912

 1331

 10.8 

 1250

Footnotes:

  1. NSBB models are typically selected based on inlet pipe size,
  2. Most models are capable of enabling multiple inlet pipes at different angles,
  3. Most models are capable of enabling multiple exit pipes at different angles or heights,
  4. Peak Treatment Flow typically is taken as the maximum flow anticipated within the inlet pipe or pipes.  This flow rate could be a 'pipe-full', 'pressurized pipe-full' or any other design or regulated flow rate condition.
  5. 80% TSS Reduction Flow Rate refers to the maximum flow rate at which a minimum reduction in TSS will be 80%. This performance criterion is based on full-scale field trials.  For additional information, please refer to Technical Reports. 
  6. The Storm Boom Storage refers to the maximum quantity of hydrocarbons which can be absorbed prior to Storm Boom replacement. Typically, this quantity relates to the removal capacity, per Storm Boom or Storm Boom set, associated with low-flow conditions.
  7. The Liquid Organic Spill Storage refers to the holding capacity of the NSBB model subjected to an up-gradient spill, exclusive of the Storm Boom(s). 
     

Contaminant Removal Efficiency vs Flow Rates1

Footnote:

  1. Flow rate values posted in the four right-hand columns are based on theoretical calculations using Stokes Law. Flow rates posted in the 'Typical Recommended Treatment Capacity' column are conservative and based on full-scale field trials.  For additional information on these latter values, please refer to the Technical Reports.
     

Please contact your Regional Representative for additional Nutrient Separating Baffle Box information.