overflow weir/slot rating

[das75]

Is there a table or formula for figuring at the flow based on slot size on an overflow?

I've got 23 closed slots 1.5"x 0.125" over 13 inches.

 

[ChrisRD]

Yes, it's called orifice flow (weir flow would apply for an overflow with no teeth). When I was designing my last overflow box, I developed a spreadsheet using the orifice formula to determine how high up the slots the water line would be at different flow rates. If you PM/email your email addy I can send it to you...

 

[Anonymous]

try this

B

 

[ChrisRD]

RC is down at the moment so I can't double check, but last time I looked there, their overflow calculator was for weir flow. Not really applicable to an overflow box with teeth...

 

[ChrisRD]

BTW, everyone who PMed or emailed for the spreadsheet should have gotten an email this morning w/attachment.