Flow rate into a horizontal bore.
Flow rate into a horizontal bore.
(OP)
This a slightly conceptual question, but it was inspired by a question that a client asked me. Suppose I am excavating a horizontal boring through some silty clay about 5 ft in diameter and 50 feet below ground surface. Let's say the water is about 10 feet below ground surface.
Assuming you know the permeability characteristics of the soil (k, let's say something lke 1x10^-7) is there a way to calculate the flow rate into the boring, asssuming uniform soil and permeability conditions?
A tunneling contractor was telling me some horror stories about doing some deep horizontal bores and how he hit an artesian well and it blew water all over the highway, and I was just curious how fast the water was actually flowing into that hole.
Assuming you know the permeability characteristics of the soil (k, let's say something lke 1x10^-7) is there a way to calculate the flow rate into the boring, asssuming uniform soil and permeability conditions?
A tunneling contractor was telling me some horror stories about doing some deep horizontal bores and how he hit an artesian well and it blew water all over the highway, and I was just curious how fast the water was actually flowing into that hole.





RE: Flow rate into a horizontal bore.
If K is really only 1x10^-7 the inflow would be trivial. Sand seams would change that considerably.
RE: Flow rate into a horizontal bore.
There's a part of me that thinks this a somewhat complicated problem, made very easy using modflow.
p.s., we'd also need to know the tunnel length, unless you just want to address this problem as a unit slice.
f-d
¡papá gordo ain't no madre flaca!
RE: Flow rate into a horizontal bore.
RE: Flow rate into a horizontal bore.
Mike McCann
MMC Engineering