LTL Directional Drilling needed to replace corrugated metal pipe culverts
that were collapsing under Highway 634 north of Smooth Rock Falls, Ontario.
"The new wall is designed to prevent any breach, even with a 99% blockage of the culverts
. That said, it would surely be much easier if the culverts
were maintained to prevent anything close to this happening in the first place."
Engineers were uncertain about fitting a precast, reinforced concrete box culvert
into the existing canal section, carved into cliffs over 100 years ago.
The Environment Agency now actively discourages the construction of new culverts
due to the potential flood risks and resulting damage to the environment.
Krevosky suggested removal of the dump material and replacement of the small culverts
with 26-foot, bottomless culverts
that would restore proper flow to the brook.
What has happened to dredging and regular cleaning of drains and culverts
? Councils don't say drains are checked and cleaned regularly.
Project manager Glenn Fieldhouse said: "Culverts
are structures which carry water underground.
The new culverts
replaced old pipes that were failing or that blocked fish passage because of their small size or erosion around the outlets.
We opportunistically examined four culverts
in Butler County between 25 May and 16 June, 2008 Butler County lies in the south-central portion of Alabama within the Coastal Plain physiographic region.
Upgrading and clearance works have also been undertaken at a culvert
on Brookfield Lane, Pont Sion Norton, which has caused considerable problems in the past..
"In situations where we have to deal with highly erodible, easily scourable soils," says Kosicki, "we are more likely to consider paved bottom culverts
unless our studies indicate that foundations can be designed to protect the structure from scour at a reasonable cost."
can be purchased at farm or building supply stores.