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Int'l. Private Sewage Disposal Code

09/28/2010 8:46 PM

Good afternoon,

In Section 605, p26, of the above referenced Code, on Installation of Conventional Soil Absorption Systems, it says the slope of the Distribution Piping (from septic tank to leach field?) shall be between 2 and 4"/100ft (0.0017" to 0.0033"/ft).

This is such a minute slope, how is this measured? By a level sighting surveying instrument?

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#1

Re: Int'l. Private Sewage Disposal Code

09/29/2010 1:41 AM

That would be one way to do it, and perhaps the best. The basic idea makes sense, but it seems pretty stringent to achieve in actual practice. Maybe some drainfield installer can chime in and say "piece of cake"?

This very gentle slope seems geared to keep the outfall from going all at once to the low end.

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#2

Re: Int'l. Private Sewage Disposal Code

09/29/2010 7:22 AM

Laser beams are used for this purpose with a target placed at the bell end of the pipe.

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Guru

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#3

Re: Int'l. Private Sewage Disposal Code

09/30/2010 1:34 AM

The Romans managed it: they used a hose with an open ended container at each end. When filled with water, the difference could be set by using appropriate markings on the inside of the containers.

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#4
In reply to #3

Re: Int'l. Private Sewage Disposal Code

09/30/2010 2:10 AM

Many places it is still done using clear plastic tubing.

Cheaper than any electronic instrument, unbreakable, easily transportable and many other features

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#5

Re: Int'l. Private Sewage Disposal Code

09/30/2010 9:47 AM

For all the leach fields we have built, we simply use a water level (which is what everyone has been describing). Clear plastic tube with a jug on one end (although the jug is not necessary). First run water through the tube for a minute or two to make sure all the bubbles are out - then cap both ends. Set the first end of the tube at your start level, (have someone hold it or fasten to a board). Now with the caps removed from the tube, person A at the beginning can yell to you and tell you when the water is "at the mark" as you raise and lower the other end of the tubing. When on the mark, you're level.

You can buy a bunch of fancy equipment for the job if you like tools, and some stores even sell pre-made water levels that have buzzers and stuff; but if it's a one time deal just get some hose.

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#6
In reply to #5

Re: Int'l. Private Sewage Disposal Code

09/30/2010 10:43 AM

Good morning Cbrunner. Thx for your note. Let's say the distribution pipe is 100' long. Say you get a 120' long piece of clear PVC tubing, 1/2" diameter. Your helper stands at the start of the pipe, with the tubing held against a surveyor's rod (?), the bottom of which is resting on top the pipe. His water level is at the 5' mark of the rod.

You're at the far end of the pipe, your rod resting on the pipe, the water level reading anywhere between 5'-2" and 5'-4". Would this approximate how it is done? If so, would this be easier than using a level? (I'm assuming the contractor either has a level, or can borrow, or rent one). In real life, the pipe would probably undilate between beginning and end. How does one avoid this, other than by calculating the equivalent drop per 20' pipe length, and performing the above every 20'?

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#7

Re: Int'l. Private Sewage Disposal Code

10/02/2010 8:44 AM

Good morning, 4" per 100' = 1" per 25' = 1/2" per 12 1/2' soooo,

take a 12 1/2 foot 2 x 4 and tape a 4' level to the top side and nail a

1/2 " piece of wood to the bottom of the 2x4 at one end, place on top of each length

of drain pipe while setting and make level. this should get you pretty close

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#8
In reply to #7

Re: Int'l. Private Sewage Disposal Code

10/02/2010 11:23 AM

Good morning Onthe beach. The simplicity of your solution is its best feature. It makes me feel so dense! <g> I learn something every day.

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