Egress window well drain Code Question

[DCA430]

Hello. First time post.

I'm installing an egress window for a basement bedroom remodel addition. My basement is a little over 7 ft below grade. I've dug a 5 ft x 5 ft x 5 ft hole. Just next to the window I have a downspout that collects secondary roof drainage to a cast iron storm drain pipe, which ultimately drains into the home's shared waste/sewer pipes.

I've been reading the UPC storm drainage code, but I still have a question. Can I tie into the cast iron storm drain pipe (with a trap) to have an egress well drain, rather than divert the water with a pipe to the footing drain pipe?

Thanks in advance!
Mel

 

[Terry]

For the information of others, in old parts of Seattle, the roof drains may share with the sewer lines. Normally in new developments, those are kept separate.

 

[Sponsor]

 

[Sylvan]

Older building code we use to use a combination sanitary and storm trap but the storm water had to be trapped and at least 40 pipe diameters upstream of the sanitary trap connection (4" pipe 13'+ upstream) possibly to prevent loss of trap seal during a major rain storm