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To: cmeilahn@cc*.cc*.ut*.ed* (Carl W. Meilahn)
Subject: Re: secchi disks and light penetration
From: Michael Chalup <chalup@pr*.ig*.co*>
Cc: techdiver@opal.com
Date: Wed, 30 Mar 94 19:52:40 PST

(Sorry for the repeat - a bit of a technical problem)

Carl:

Light attention with depth in a body of water can be most simply
modeled using a simple exponential equation:

                                 -kz
			I = Io  e  


	I  = irradience at depth z
	Io = irradience at depth = 0
	k  = extintion coefficent (in inverse length units)
	z  = depth of light measurement.

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