- This topic has 7 replies, 5 voices, and was last updated 12 years, 1 month ago by Bxbyard.
27 May 2007 at 5:10 pm #279584MasterPlumbersKeymaster
I am in installing a new septic system. It is about 200 ft from the home and has a pretty steep slope (steep driveway). Is there a maximum slope to a septic tank, beyond which will cause solids from liquid separation.
Are the clean outs every 60′ or 100.
thank you Carl
25 Oct 2007 at 12:50 am #301727Retired plbg1
You should give the sewer about 1/4″ to the ft. or 1″ to evey 10′. You should have a co. evrry 100′.
Art Retired Plbg.
24 Nov 2007 at 12:12 pm #301757digger
The fall is not important, the flush capacity is the important matter, the flush should be not less than about 2 gallons then the solids will not seperate from the water.
1 Dec 2007 at 5:22 am #301759siekster
The earlier post was correct… fall should be between 1/4 to 1/8 of an inch. The number of cleanouts will generally depend on the local or state codes, anywhere between every 50 to 100′, or after a certain number of turns, for example, every 4 45’s.
Flushing capacity for a standard residential toilet in the US is 1.6 gallons per flush, which is plenty. For a sewer line that long, proper grading will be the key to it properly draining.
1 Dec 2007 at 1:22 pm #301760digger
The falls for drainage lines in NSW Australia are
65mm pipe = 1 foot fall in 40 feet
80mm pipe = 1 foot fall in 60 feet
100mm pipe = 1 foot fall in 60 feet
125mm pine = 1 foot fall in 80 feet
digger 2007-12-01 13:23:55
2 Dec 2007 at 3:32 pm #301761siekster
I had to pull out the old mm to inch calculator for that one!! Here in North Carolina, we use the “International” Plumbing code, although it seems to vary from state to state, let alone internationally.
Drainage lines 2″ and under- minimum 1/4″ per foot, or 10″ fall for 40 ft.
Drainage lines 3″ to 8″- minimum 1/8″ per foot, or 10″ fall for 80 ft.
Drainage lines 8″ and above- minimum 1/16″ per foot or 10″ per 160 ft
More pitch allows more DFU’s (Drainage Fixture Units) to be placed on drainage lines, up to 1/2″ per foot fall.
siekster 2007-12-02 15:33:21
25 Mar 2009 at 1:34 pm #301918Bxbyardcarl dearth wrote:I am in installing a new septic system. It is about 200 ft from the home and has a pretty steep slope (steep driveway). Is there a maximum slope to a septic tank, beyond which will cause solids from liquid separation.Are the clean outs every 60′ or 100.
thank you Carl
25 Mar 2009 at 1:38 pm #301919Bxbyard
I want to be convinced slope cannot be too much! keep being told solids will seperate so best to install steps ( not sure if 90 deg or 45 deg steps would be best if required)… iread sufficient flush volume is one solution but if flush is modest will too much slope make solids separate??..any expert/ prectical advice apprecieted
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