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Installing drain pipe for rain run-off Sammy bin Snoozin 10-08-2007
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Posted by Sammy bin Snoozin on October 8, 2007, 11:10 am
I've got to install a drain pipe from a low spot to the street gutter - =
about 100 feet. Is there a formula to figure the maximum flowrate that =
a 4-in pipe will carry using the 1/4 per foot slope assuming the inlet =
is full?

Sam



Posted by Rod Speed on October 8, 2007, 4:39 pm
> I've got to install a drain pipe from a low spot to the street gutter
> - about 100 feet. Is there a formula to figure the maximum flowrate
> that a 4-in pipe will carry using the 1/4 per foot slope assuming the
> inlet is full?

Yep.



Posted by Dennis on October 8, 2007, 7:04 pm
GPM = 0.0408 x pipe ID ^2 x distance / water velocity

0.0408 * 16 sq.in. * 100 ft.
--------------------------- = ~520 gal/minute
2 ft./sec.

re: DeWalt Plumbing Professional Reference

I've got to install a drain pipe from a low spot to the street gutter -
about 100 feet. Is there a formula to figure the maximum flowrate that a
4-in pipe will carry using the 1/4 per foot slope assuming the inlet is
full?

Sam





Posted by Sammy bin Snoozin on October 9, 2007, 2:11 am
Thanks, Dennis.

> GPM =3D 0.0408 x pipe ID ^2 x distance / water velocity
>=20
> 0.0408 * 16 sq.in. * 100 ft.
> --------------------------- =3D ~520 gal/minute
> 2 ft./sec.
>=20
> re: DeWalt Plumbing Professional Reference
>=20

> I've got to install a drain pipe from a low spot to the street gutter =
-=20
> about 100 feet. Is there a formula to figure the maximum flowrate =
that a=20
> 4-in pipe will carry using the 1/4 per foot slope assuming the inlet =
is=20
> full?
>=20
> Sam
>=20
>=20
>=20
>

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