Water Volume of 30 inch culvert??
 

James wrote:
Can anyone calculate the number of gallons that a 30 inch wide
culvert, 48
inches long, will hold ??

Thanks for any info !!!
--James--

Are you doing your homework?

"Can anyone calculate the number of gallons that a 30 inch wide
culvert, 48
inches long, will hold ?? "

Pie are square

Area of a circle equals Pi times the radius squared.

3.14 * 15" * 15"

33912 cuin
33912 cubic inch = 146.8051948 gallon [US, liquid]

This assumes the culvert is round, is capped on one end, and stood up,
then filled to the rim.

A culvert, laid horizontally, in the ground, would be filled to about
85% to 95%, considering air would be at the top. Well, that would be
during a flood, but in dry times, there might be a few inches, flowing.

Is the culvert oval shaped? I'll assume round.

Is the water stagnant or flowing?

Since you are too lazy to do your homework here's a bonus question.

What if you have a drainage canal, 15 feet wide and 10 feet deep. Water
is flowing, and the depth is 2 feet on the wall markings. You look
upstream to the mountains and it is raining steady. You have 3-30 inch
diameter x 20 foot culverts, side by side, in the culvert and they are
covered in concrete, with a road over them. Height from stream bottom
to road is 5 feet. You have someone 100 feet upstream, drop a floating
object in the water, and it takes 10 seconds to reach you.

How many gallons per minute are flowing through the culverts?

At what flow rate will the flow of water, exceed the capacity of the
culverts, and flow over the top of the road:
by 1 inch?
by 12 inches?
by 48 inches?

:)

Halcitron wrote:
Since you are too lazy to do your homework here's a bonus question.

What if you have a drainage canal, 15 feet wide and 10 feet deep.
Water is flowing, and the depth is 2 feet on the wall markings. You
look upstream to the mountains and it is raining steady. You have
3-30 inch diameter x 20 foot culverts, side by side, in the culvert
and they are covered in concrete, with a road over them. Height from
stream bottom to road is 5 feet. You have someone 100 feet upstream,
drop a floating object in the water, and it takes 10 seconds to reach
you.

How many gallons per minute are flowing through the culverts?

At what flow rate will the flow of water, exceed the capacity of the
culverts, and flow over the top of the road:
by 1 inch?
by 12 inches?
by 48 inches?


Better:
"How much water flows out of the mouth of the Mississippi per year. Give two
methods:

Answer 1:
Assume width of river at the mouth is two miles, flow is 5MPH and average
depth is five feet. Turn crank.

Answer 2.
Assume Mississippi drains the center half of the country (from Rockies to
Appalachia). That is, 1500 miles E-W, and 1000 miles N-S. Further assume
this area gets 50" of rainfall per year. Turn crank.

This answer does not mention the effects of evaporation and
infiltration, both important processes on an area that size.

HeyBub wrote:
...Answer 2.
Assume Mississippi drains the center half of the country (from Rockies to
Appalachia). That is, 1500 miles E-W, and 1000 miles N-S. Further assume
this area gets 50" of rainfall per year. Turn crank.

On Mon, 18 Apr 2005 03:07:31 -0500, someone wrote:


Assume Mississippi drains the center half of the country (from Rockies to
Appalachia). That is, 1500 miles E-W, and 1000 miles N-S. Further assume
this area gets 50" of rainfall per year. Turn crank.

Any allowance for evapotranspiration? Not all the rainfall must drain
out as a liquid. In some climates, this accounts for a very
significant proportion of the annual rainfall.

We did this back in 9th grade Earth Science.


Reply to NG only - this e.mail address goes to a kill file.

On 16 Apr 2005 22:42:28 -0700, someone wrote:


James wrote:
Can anyone calculate the number of gallons that a 30 inch wide
culvert, 48
inches long, will hold ??


Are you doing your homework?

Yeah, does he REALLY want to know the volume it will HOLD, or the rate
that it will FLOW??? The first answer is hardly ever what a culvert
is used for.


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