inlet stone capacity

[JLNWWW]

I am looking for a good program or chart for inlet stone capacity. It must be able to allow for various cross slopes and street grades.

 

[PECPESC]

What is "inlet stone capacity" ? I am unfamiliar with that term.

 

[JLNWWW]

Street catch basins may have directly behind them a inlet stone. It is used with a 3 flange frame and the inlet stone provides an additional throat to enter the structure.

 

[dicksewerrat]

Are you talking about the hole in the casting that is up in the curb? What country are you in?

 

[JLNWWW]

No, It is not the practice to use frames that have these a part of them. In the New England area we place a granite stone with a notched out 24" wide throat directly behind the frame. The inlet stone is 6'long and 18" high and 6 to 8" thick. Storm water will flow in the top of the grate and also behind it were it drops directly into the structure.

 

[PECPESC]

There are basically three types of inlets. Throat, grate and combination which has a throat & a grate.

Just treat the design as a normal combination inlet. There is a lot of info available for design of combination inlets.

Here is one source

http://www.wrpllc.com/books/udinlet.html

 

[JLNWWW]

Thanks for the reply. I am going to order the book.
If anyone else has any other references they would also be appreciated.

 

[dicksewerrat]

Neenah foundry has this 'inlet stone' in cast iron. That is the common item in the Midwest. they have the design info on their web site.

 

[JLNWWW]

I have there charts and slide rules but it is not exactly the same as a granite inlet stone, but I do use there grate capacity information.