Any manufacturers sell off-the-shelf flow measurement weirs for stormwater discharge?

[beej67]

I'd like to drop an in-line weir of some kind downstream of a stormwater pond to measure discharge flow rate. Ideally with a remote sensing rig to document peak flows at a minimum from storm events, but potentially also to measure hydrographs.

This is an industrial application, and data might be tied into their SWPPP.

Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East -

http://www.campbellcivil.com

 

[cvg]

http://www.plasti-fab.com/plasti-fab-products/#

 

[beej67]

Thanks for that.

Related question, at what storm frequency do industrial sites usually have to report stormwater discharge rates from combination stormwater/containment ponds? I can't imagine it's standard practice to use a Parshall weir up to the 100 year storm. Anybody know that requirement? I imagine it's buried somewhere in industrial SWPPP rules.

Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East -

http://www.campbellcivil.com

 

[cvg]

they have to capture the first flush, often this is 1/2 inch of rain. more than that may cause discharge. the industrial sites I am familiar with retain the 100-year storm with no discharge.

 

[beej67]

What drives those regs? State agencies or federal?

Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East -

http://www.campbellcivil.com

 

[cvg]

NPDES and first flush requirements are a direct result of the EPA clean water act which was passed in 1972

https://en.wikipedia.org/wiki/Clean_Water_Act