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Straightening and widening stream
channels increases stream horsepower
and often the flooding or erosion is
transferred to downstream neighbours
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Straightening the channel and removing
riparian vegetation increases risk to
property. The effect is additive as more
development occurs along streams.
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Beaver dams come and go naturally, but
removal of too many all at once increases the
stream's slope and horsepower. Increased
erosion is the result
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Riparian actions that
create problems
Often, because of our impatience with
spring flooding we cut through meanders
to "speed" the water through, or straighten
and channelize to protect buildings.
Bridges are expensive, so culverts
become the choice for many stream
crossings. |
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Culverts increase stream velocity because friction
between the water and the culvert material is
reduced. If improperly sized or installed, culverts
increase horsepower and downstream erosion is
certain.
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By removing meanders and turning
banks to concrete we turn a stream into
a canal. The stream loses access to its
floodplain. Most riparian benefits and
values are lost. The problems of flooding
and erosion are shifted downstream.
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Excessive removal or alteration of vegetation
by livestock decreases friction on the banks
and increases stream horsepower. The
stream's defense against erosion is reduced.
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All of these actions can result in
more pressure on the gas pedal,
more speed and more stream
energy.
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