Sanitary Sewer sizing 2

[dln001]

I am currently working part-time for a civil engineering firm while I finish my senior year in a CE program. The engineers in my office have been wonderful teachers and recently I was given the responsibility of designing the site plan for a 120 room hotel. In the process, I exposed what I consider to be a hole in my co-workers knowledge. Sizing the sanitary line was complicated when no one could give me a definitive flow-rate for hotels. I eventually found a rate of 130 GPD per guest room (24 hours). Using a peak factor of 2 I arrived at approximately 22 GPM. Any help with sanitary sewer flow rates would be appreciated. I am located in Virginia if that has any relevance.

 

[RWF7437]

Almost certainly, you'll be required by the local Building Department to size the sewer using the tables and graphs in the Uniform Plumbing Code. This method, while fairly simple, is also pretty conservative. Get a copy of the Code, or whatever Code is used in Virginia, and look up the method.

If you have a restaurant, kitchen, lounge, etc. then things get a little more complicated.

Another good reference is Homer W. Parker's, Wastewater Systems Engineering. My copy, published in 1975, lists an average hotel flow of 50 gpcd. Your flow rate appears to be a peak flow so you should prbably NOT apply a peaking factor to it.

As a real check, you might examine the water use rates of existing similar hotels in your area. Their water use records should be available to you from your local water supplier(s). These are usually public records in most States so don't accept NO for an answer.

Good luck,

 

[salahm]

Your finding of 130gpd per room is good and same with the peaking factor
In WNY we use 130gpd per room