Collecting rain off of the roof

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Bill sent through this link to a site that has many different sqft ideas and contraptions, among them a set of barells that traps rainwater that ran off of a roof and through a raingutter.  Now, a month or two ago I saw somebody on this list cautioning somebody about using runoff that came from off of a roof. (Sorry, cannot find that email now...)  Is there really a problem with doing this, and what is it?  Does it depend on the roofing materials?
 
I just always thought it would be a cool idea to catch such rainwater and set up some sort of system that immediately uses it to water a garden or a greenhouse.  (Actually, my garden already is the unintended beneficiary of a lot of shed run-off, down a tin roof...)
 
Does anybody know the issues here? (of if there ARE any issues??)   Thanks.

>>> Bill & Vera Missenbmissen@telusplanet.net> 2/23/01 1:29:48 PM >>
 
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