Septic System with Leach Field

[sunfun50]

How would you calc the average design flow for the following:

A restroom building for a rodeo park. The park is used once a year for 3 or 4 days. The flow is 4600 gallons per day.

It's a unique situation, because the peak usage is the only usage for the entire year.

 

[civilperson]

This is not a good application for septic tank/leach field. Use a large volume tank, 5000-6000 gal, or a series of normal size tanks and design the field for flow rateentire 4 day volume minus the tank volume)/(4 days). Laterals are cheap and most states require that an area be available for 200% of the calculated required flow, (100% replacement leach field in original layout). Use the entire 200% area for initial leach field and run water slowly into the sewer after the heavy use period for another four days. The residence time in the tank will be shorter than normal, so the process of bacterial digestion of organics will occur in the laterals as well as the tank. Maintain the bacteria with periodic infusion of organic material during slack times, (50 lbs dog food/weekly).

 

[sunfun50]

Thank you for the response, it helped a lot.

 

[bimr]

You should investigate the use of portable toilet products:

http://www.norsic.com/hamptonian.html

 

[kenvlach]

Use some concentrated biological product for septic tank activation (microbes). Perhaps 2 weeks prior & 1 week prior to the event, plus the 50# dogfood as suggested by civilperson. See links at
Too much Olive Oil in septic system
thread161-177480

 

[RHR69]

Been there and done that. Have two county fairgrounds and both only have a fair for 5 days a year. Tried the septic route and didn't get sufficient treatment. The one; we have taken the tanks and use them as holding tanks and the waste is hauled to a local sewage treatment plant and bled into the system at nite due to the size of the system. The other is also a holding tank but is hauled and injected directly into agr fields.