Design Flow for Septic Sewer System for National Guard Rediness Facility

[rcspiel]

I need some opinions to this question. What design flow would you use to design a septic sewer system for a National Guard Rediness Facility?
Facility includes typical fixtures like 20 showers, bathroom fixtures, kitchen equipment, etc. Based on fixtures, Total DFU's is 354 which will require a 6" discharge line. Using Hunter's curve, water demand estimated at 145 GPM. Typical occupancy is 23 people per day and on guard weekends (1 time a month) at 361 people. Similar type facilities would require using 20gal/day/person. That would be 460 gal for 28 days of the month or 7,220 gal for guard weekend. Any suggestions?

 

[ashtree]

I think you are going to have to design a system for the peak flow. Because the peak is so large and so widely spaced compared to the normal flow it will be difficult to use any type of flow equalisation or attentuation system that will have much impact, unless you are prepared to store the higher flow and slowly release it over many days or weeks. This can be done but will bring some complexities.

But if you design for the smaller flows only then you will very likely get overflows on the big days.

If the high useage is always only going to be one day per month you could perhaps reduce the assumed values a little to see what impact on the design might be. For example where a range of typical loading is given by some guideline use the lowest value for everything and see what you get.

Regards
Ashtree
"Any water can be made potable if you filter it through enough money"