Wadcutter wrote:
Dutch_12078 wrote:
Most standard (non-HE) top load washing machines in use today can use as much as 40 gallons of water per load. Toss in a shower or two, or a bath, and you can easily exceed a 50 gallon discharge in a short time. Most septic tanks have enough head room to accommodate a temporary backup from the leach field if needed. The scum layer just floats up higher.
Not the same. The washing machine isn't dumping all 40 gals at once but only a percentage of the 40 gals over a period of 30-60 minutes. A washing machine will only dump 5-7 gal at a time at the end of each cycle.
A septic tank water level will be equal to the bottom of exit port in the tank and below the inlet port.
Overflowing a septic tank one time is not likely to damage the leach field. It's the accumulated effect over a period of time that causes the damage.
The outlet baffle prevents the floating scum layer from entering the outlet when the water level rises as waste enters the baffled inlet. All that happens with a larger influx of waste water is the scum layer rises a couple of inches higher on the baffle briefly as the water moves into the leach field, dry well, transpiration mound, etc.