HomeMy WebLinkAboutMemo re: bluff line Christine Mattson
From: Christine Mattson
Sent: Thursday, June 27, 2013 2:56 PM
To: 'Kelly- Schoborg Land Services, Inc.'
Cc: Melanie Curtis
Subject: 4355 Bayside Road
Attachments: admin@ci.orono.mn.us_20130627_142 OO.pdf
Hi Kelly,
Orono defines the `top of bluff' line as a collection of points on he cross section of a bluff that depict the break
point between slopes steeper than 18% and slopes flatter tha 18%. Our method for analyzing bluffs is to plot
a cross section of the bluff contour-by-contour, establish the sl pe percentage between each contour line, and
establish the top of bluff as the contour point below which the lope becomes (i.e. changes to) greater than
18% and above which the slope for a distance of 50' from that break point stays at 18% or less. This method
has consistently resulted in a 'top of bluff line that reasonably atches the visual top of bluff.
I have attached an example of a bluff analysis that was prepa d for another site in Orono.
Let us know if you have any questions.
Christine�
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