Anyone familiar with the new SFWMD and SWFWMD nutrient loading reqs?

[beej67]

I'm having a bastard of a time getting the SWFWMD nutrient loading spreadsheet to work for treatment train systems. Anyone have any experience with this thing? It doesn't seem to want to let me enter in a 2nd or 3rd BMP without their own separate drainage basin areas.

 

[umjeffr]

I assume you are checking these spreadsheets out for interest. The latest date these will be law is June 2010.
I have been reviewing the updated laws and spreadsheets, but i have not tried to enter any info yet. I will give it a try.

 

[beej67]

I've got a project on an outstanding florida water with SFWMD, and they gave me the SWFWMD spreadsheet as a go-by, but I've had to build my own because the SWFWMD sheet doesn't seem to want to behave properly.

When you're doing your cross-check, try building a treatment train with two dry retention systems in series, the second one of which doesn't have a watershed draining to it, just the first dry pond. See if you get answers that make any sense. I haven't been able to get any.

 

[beej67]

Also -

Do you know whether the pre/post limits on these things are being set by concentration or by mass? Obviously there's a pretty significant difference, given the changes in total annual runoff volume from developed sites.