BOARD02497

• Board Meeting Date: 7/14/1971
• Description: Agenda or Table of Contents, Minutes, Memos
• Board Meetings - Doc Type: Meeting

I.LO.J

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engineer is to work with local interests in
coordinating the purchase of land, developing
right-of-way drawings consistent with our design
and then make such alterations that are compatible
with the design that local interests desire or
find more economical.

As Mr. Sparks indicated, this project begins
at the highway bridge and ends at West Oxford
Avenue. The inflow downstream of the dam for .a
one percent probability gradually increases from
6,600 at the first tributary inflow to 14,000
downstream at the end of the project area. There-
fore our channelization was based on a design
confined below ground level, for this discharge.
The requirement for this is channel lowering at
some spots. Actually we begin approximately at
the grade of the upstream channel and due to the
certain water furnishing features, this calls for
a channel deepening to a maximum depth of about
5 feet below the existing channel, and also some
channel widening. We begin at the upstream end
with a hundred foot wide channel and at the
extreme downstream end is a l60-foot wide channel.

Bridges, with the exception of Crestline,
which we understand will be eliminated, require
little alteration in this design, some abutment
work and wingwall treatment.

We contemplate using one on three side slopes
from this width of 100 feet at the upstream end
to 160 feet at the downstream end, with the
exception of the riprapped area outside of curves
which will be to one on two.

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The original authorization, contemplated
both levee and channel work for the full reach
of the river below the dam. When we studied the
levees, they did not seem compatible with this
area at all. That is why channel work alone was
selected.

We plan to seed the right-of-way area, ov~r-
bank area and have tree plantings to replace ~e