Sizing Lift Stations for State Park in Texas...
Sizing Lift Stations for State Park in Texas...
(OP)
Hi, this is my first post.
My firm is in the process of designing a new sanitary sewer collection system for a Texas State Park. They are currently on septic systems. Due to the terrain and need to minimize disturbance, we are proposing a series of lift stations for sewage collection and transfer to the nearest City's collection system. I have no flow data, but I do have the number of campsites with sewer connections as well as the number of restrooms and fixtures in each.
The state provides only vague guidelines for the total effluent from the park: 30 gallons/person/day (gpd) for overnight users and 5 gpd for day users. The park's max capacity is 482 overnighters and 1,750 day users. Using a 16 hr day, that's only 24.18 gpm... with a peaking factor of 3 I get 72.5 gpm for the whole park at max capacity. Does that sound reasonable?
I was thinking about using fixture units to estimate flows at various locations for individual lift stations (6 total), but I can't find a formula for going from fixture units to gpm. Also, I'm not sure how to determine the fixture unit count for the typical RV or camper. Can someone point me to a formula or give me some advice?
Thanks,
Adam Stockton, P.E.
My firm is in the process of designing a new sanitary sewer collection system for a Texas State Park. They are currently on septic systems. Due to the terrain and need to minimize disturbance, we are proposing a series of lift stations for sewage collection and transfer to the nearest City's collection system. I have no flow data, but I do have the number of campsites with sewer connections as well as the number of restrooms and fixtures in each.
The state provides only vague guidelines for the total effluent from the park: 30 gallons/person/day (gpd) for overnight users and 5 gpd for day users. The park's max capacity is 482 overnighters and 1,750 day users. Using a 16 hr day, that's only 24.18 gpm... with a peaking factor of 3 I get 72.5 gpm for the whole park at max capacity. Does that sound reasonable?
I was thinking about using fixture units to estimate flows at various locations for individual lift stations (6 total), but I can't find a formula for going from fixture units to gpm. Also, I'm not sure how to determine the fixture unit count for the typical RV or camper. Can someone point me to a formula or give me some advice?
Thanks,
Adam Stockton, P.E.





RE: Sizing Lift Stations for State Park in Texas...
A peaking factor of 4 would probably be more appropriate since this is such a small population.
One fixture unit is about 1 gpm.
Don't believe that you can use fixture units for sizing of RV dump stations. A RV dump station is more or less a generic design.
RE: Sizing Lift Stations for State Park in Texas...
I'd think I could assume an RV has:
1-kitchen sink
1-bathroom sink
1-shower
1-toilet
RE: Sizing Lift Stations for State Park in Texas...
http://w
http://www.usbr.gov/pmts/architecture/recfac/
http://
http://en.wikipedia.org/wiki/Recreational_vehicle
RE: Sizing Lift Stations for State Park in Texas...
RE: Sizing Lift Stations for State Park in Texas...
50 gpd per space for an RV Park w/ Water & Sewer.
20 gpd per space for an RV Park w/ Dump Station
35 gpd per person for a Campground w/ Central Bath & Toilet
I'm not sure how the dump station RV users end up with less output than the campers, but there you go.
RE: Sizing Lift Stations for State Park in Texas...
Richard A. Cornelius, P.E.
WWW.amlinereast.com