Flood
Control on the Columbia Slough
We’re pumping a lot of water during
the winter rainy period. Actually, we’re pumping over a billion
gallons per day. Our pumps run nine to ten months a year,
continuous, twenty-four hours every day . . .We’ve
also developed new techniques to provide flood protection,
stormwater conveyance environmental protection of our waterways
and levee areas. . .
.We used to do all of our maintenance from top of bank, and
to do that, that means you have to remove all the trees. You
know, the old dragline excavator would work from top of the
bank to remove debris and silt that blocked the flow of water.
To do this, they had to reach down the bank, and that would
damage the vegetation. And that’s a direct conflict with what
we’re trying to accomplish now with all the water quality
issues and the habitat restoration that we’re trying to do
along our waterways. Dave
Hendricks, Operations Manager, Multnomah Drainage District
After
the flood of 1996, the Multnomah Drainage District received financing
to upgrade the flood control pump system on the Columbia Slough.
The Drainage District maintains and manages eleven secondary Pump
Stations in the secondary slough systems and two Pump Stations
on the main Columbia Slough.
 
These photos show "Pump
Station No. 4", which is located off Marine Drive
at NE 172nd. Before the levee was built this was a natural
channel leading to the Columbia River. Today, the pumps
move water from the Slough through large pipes that
go through the levee and discharge underwater into the
river. The pump station was modernized in 1998 and contains
four pumps with a combined capacity of 272,000 gallons
per minute. MCDD has a twin pump station, located off
NE 33rd, that discharges into the Lower Slough. In all
four drainage districts, the total pumping capacity
for all "primary" pumps that remove stormwater
from the districts is one billion
gallons per day. Photos
courtesy of MCDD#1
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