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Re: [TowerTalk] Jetting or Hydraulic-Ning

To: <>
Subject: Re: [TowerTalk] Jetting or Hydraulic-Ning
From: "Robert Chudek" <>
Reply-to: Robert Chudek <>
Date: Fri, 3 Mar 2006 15:28:12 -0600
List-post: <>

It looks like we've got a pretty strong contender to the bi-annual "How do I 
find true North?" thread.

Who wooda thunk? :-)

73 de Bob - K0RC

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Message: 1
Date: Thu, 2 Mar 2006 23:41:28 EST
Subject: [TowerTalk] Jetting or Hydraulic-Ning
Message-ID: <>
Content-Type: text/plain; charset="US-ASCII"

Although the suggested method of using a water jet to run coax under a drive 
way would also be my choice, I would like to suggest a caution.

Before starting, find out the substructure composition and depth before 
starting your water jet.  Most driveways have some form of substrate consisting 
crushed stone 3 to 4 inches or more thick.  On top of that may be cement, 
black top or a sand base and pavers.  It is very easy to undermine the paver 
blacktop driveways if you errode the sub base.

Dig down along side of the drive, determine the make up of the structure and 
its depth.  I would go at least 6 inches below the substrate to start your 
water jet.

The other problem is making sure you have excavated enough of a trench to 
allow your jet tube to be parallel to the ground so that you don't angle your 
tunnel down and end up very deep on the opposite side.

Here in Florida this is an easy task as we are dealing for the most part with 
Sand.  Clay can be a little tougher.

Norm W4QN

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