KATHLEEN SAYCE PHOTO Recent washout of the highway at Peter's Creek occurred when blockage in the culvert due to debris coincided with a rain burst. Water built up behind the roadway levee and pushed through, washing out the soil and highway above the culvert. It is being replaced with a box-type culvert, pictured in the accompanying photo.
KATHLEEN SAYCE PHOTO The replacement will be a box culvert like this one near Ft Columbia, where a small culvert was replaced to improve stormwater flow in Chinook Marsh. This is essentially a small bridge; designing the new box culvert for Peter's Creek is underway.
KATHLEEN SAYCE PHOTO Recent washout of the highway at Peter's Creek occurred when blockage in the culvert due to debris coincided with a rain burst. Water built up behind the roadway levee and pushed through, washing out the soil and highway above the culvert. It is being replaced with a box-type culvert, pictured in the accompanying photo.
KATHLEEN SAYCE PHOTO The replacement will be a box culvert like this one near Ft Columbia, where a small culvert was replaced to improve stormwater flow in Chinook Marsh. This is essentially a small bridge; designing the new box culvert for Peter's Creek is underway.
When civil engineers, architects and planners design buildings, roads, bridges, levees, dams, drainage canals and other structures, they use the principle of stationarity to decide how high, how strong, how wind resistant, this structure has to be to withstand a typical 50-year, 100-year, 500-year or 1,000-year event.
All construction balances on a line between built “strong enough” and “over-built too much” to keep the cost as low as possible. The stationarity principle has historically ensured that the structure will last for its planned life, which may be anywhere from 20 years to several hundred years.
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Keep it Clean. Please avoid obscene, vulgar, lewd, racist or sexually-oriented language.
PLEASE TURN OFF YOUR CAPS LOCK.
Don't Threaten. Threats of harming another person will not be tolerated.
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