GPD for Football Stadium/Baseball Field 1

[cenc]

I am in the process of designing a lift station to handle the waste from the restrooms at a high school track/football field (approximately 2,500 seat capacity), a softball field and baseball field. My fixture unit count is 42, though would like to find some flow numbers. Closest I have found is for a picnic area, which was 5 GPD/person. Any help would be appreciated.

Thank you.

 

[cenc]

Just found a table in the Anne Arundel County, MD design manual stating 5 gpd/seat for sports arena.

 

[jgailla]

In Florida it's 4 gpd/seat for stadiums, close enough to 5. I would be more concerned about the appropriate peaking factor than the daily flow for the lift station design.

 

[cvg]

agreed, peaking factor is way more important than total daily flow. Assume the 5 gpd occurs during 1 hour so it is 5 gph

 

[cenc]

Correct me if I'm wrong, since I'm borderline idiot with regards to water and sewer design at this time. Ater posting this I got to thinking that I should use fixture units since I'm looking to convert existing bathrooms from septic onto a low pressure sewer. This restroom only has one toilet in each bathroom with a sink, so with a DFU of 14, approximately 14 gpm.

 

[nackra]

Don't forget to calculate PEAK flows when everybody flushes after/before games. Think of half-time at high school football game.

 

[bimr]

The peak flow for a facility like this will occur between innings.

For a football stadium, you assume that half the crowd will use the facilities at halftime. Each flush would be 1.6 gals. This would occur during a 15 time interval (halftime).

The peak flow will be less for a baseball stadium than for a football stadium because there are more time breaks.

As you have determined, the best estimate will be based on using the fixture method.

http://www.constructionknowledge.net/mechanical/mechanical_plumbing.php

 

[cenc]

Thanks for the feedback, though I'm a little confused now. I've read on another post that 1 DFU is approximately 1 gpm, though in your link, bimr, the paragraph above table 1-5 states 1 DFU represents 7.5 gpm. If this were the case, one toilet would represent 45 gpm (6 x 7.5). At 1.6 gallons per flush, that's 28 flushs a minute. Obviously not possible. The 1 DFU to 1 gpm seems to makes sense in that, I could see a toilet getting flushed 4 times a minute during a peak time (6.4 gallons). Based on this, it would seem that DFU's do not get multiplied by a peaking factor?

 

[bimr]

FU values represent the probable flow that fixture will discharge into a drainage system. 1 DFU is approximately 1 gpm.