[AT] OT Low water crossings

[Charlie V]

Don,

Keep in mind that strength of concrete can vary quite widely based on
the ratios of the ingredients used in the mix. Cecil may be well
informed on this subject as is the internet.

Charlie V. in WNY




On Thu, Feb 9, 2012 at 5:20 PM, Don Bowen <don.bowen at earthlink.net> wrote:
> My driveway crosses two little creeks.  They are usually dry except
> during storms when they can be as much as four feet deep.  After a storm
> it may take days for them to come down.  The first crossing is gravel
> and the previous owner had build a concrete and rock dam on the
> downstream side to control washouts.  The result kept the water over a
> foot deep for days after a small rain.  I cut a slot in the dam and now
> it drains down to about 6 inches in a day.
>
> The second crossing is a concrete low water bridge with two culverts.
> usually within a few hours of a rain the water is under the concrete
> flowing though the culverts.  The problem here is that the culverts plug
> with gravel in heavy rains.  The reason is that who ever built the
> crossing has the outlet end of the culverts higher than the inlet by
> several inches.
>
> I plan to take out the culverts and replace them with a single larger
> culvert properly installed.  What I need to know is how thick the
> concrete must be above a given size of pipe.  I am assuming that the
> larger the culvert diameter the thicker the slab over it must me.
>
> As for the gravel crossing I want to build a concrete crossing.  I need
> to know what I need to do and references.  I have a good idea what is
> needed but I would like comments from those with experience.
>
> You can see in this picture the right culvert is plugged.  The water at
> the inlet is almost at the top of the culvert.
> http://www.braingarage.com/Dons/Travels/journal/May%2011/images/flowing.jpg
>
> This is what it looks like after a heavy rain.
> http://www.braingarage.com/Dons/Travels/journal/April%2011/images/flooded%20drive.jpg
>
> And a heavier rain.
> http://www.braingarage.com/Dons/Travels/journal/April%2011/images/flooded%20drive.jpg
>
> The gravel crossing after a rain before I opened up the dam a
> little\http://www.braingarage.com/Dons/Travels/journal/January%2011/images/summer.jpg
>
>
> --
> Don Bowen           KI6DIU
> http://www.braingarage.com/Dons/Travels/journal/Journal.html
>
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