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Old 01-13-2011, 09:37 AM   #1
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Drain Field modification


I've got a 3 year old 700' lpp drainfield... 7 rows, 100' each with a partial
mound of about 6". I want to shorten 10' off of each line on one end to
make room for a garage. House has two baths with 2 adults.

Do you guys think the system will be fine shortened the 70'? Is it worth it to
add the 70' back into the sytem?

thanks

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Old 01-13-2011, 09:58 AM   #2
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Originally Posted by bigcrush View Post
I've got a 3 year old 700' lpp drainfield... 7 rows, 100' each with a partial
mound of about 6". I want to shorten 10' off of each line on one end to
make room for a garage. House has two baths with 2 adults.

Do you guys think the system will be fine shortened the 70'? Is it worth it to
add the 70' back into the sytem?

thanks
I would suggest contacting the entity that handles septic permits in your area (typically the local health department). Sizing of the tank and drain field is usually based on the number of rooms (not fixtures or people) in the house, soil conditions, perc tests, etc.

Good lookin' out though. Most people don't think about underground utilities when planning a project. Can't believe how many times I've seen patios, decks, buildings, retaining walls, etc., built over septic tanks, sewer lines, and drainfields.

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Old 01-13-2011, 10:11 AM   #3
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Drain Field modification


This is a good read.

http://www.nmenv.state.nm.us/fod/liq...AFactsheet.pdf
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Old 01-13-2011, 10:14 AM   #4
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Drain Field modification


you are removing one line from a system sized for your house, what do you think is correct here?
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Old 01-13-2011, 11:52 AM   #5
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Drain Field modification


Seven rows seems like a lot to me but the soil probably is not that absorbent hence the need for 7 rows.

The system was designed and installed at or close to the minimum requirements for your house (bedrooms, etc.) and land (perk test, etc.). So you cannot simply decommission part of the system to make room for your garage.

You could get a septic company come in and design just an addition next to your field in a different direction to compensate for the part you want to decommission.
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Last edited by AllanJ; 01-13-2011 at 11:55 AM.
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Old 01-13-2011, 01:24 PM   #6
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Drain Field modification


thank you all for your thoughts.

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Originally Posted by AllanJ View Post
Seven rows seems like a lot to me but the soil probably is not that absorbent hence the need for 7 rows.

The system was designed and installed at or close to the minimum requirements for your house (bedrooms, etc.) and land (perk test, etc.). So you cannot simply decommission part of the system to make room for your garage.

You could get a septic company come in and design just an addition next to your field in a different direction to compensate for the part you want to decommission.
It seems excessive to me as well... every other house in my neighborhood have gravity fed systems with much smaller drain fields then mine.

I'm thinking about adding a new 50' line off the center feed line along side the other rows (installing the same way as the existing drain field ie: trench, gravel, pipe, gravel, fabric then topsoil). This will result in only a 20' loss, and provide the room I need for the garage.

I still have the prints from when it was installed to go from.

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