Saturday, August 13, 2011
USGS Earthquake Center has confirmed a rare South Dakota earthquake centered near the state's capital city on Tuesday afternoon
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100 year flood -- A level of flood water that occurs every 100 years on average. This can be more accurately described as flood conditions that have a 1 percent probability of being met or exceeded each year.
500 year flood -- Flooding with an annual probability of 0.2 percent that conditions would be met or exceeded.
Berm -- A raised barrier or shelf separating two areas. Often built to control erosion by slowing or directing surface runoff.
CFS (Cubic feet per second) -- The measurement used to describe the the amount of water flowing through a river or released by a dam. A cubic foot has the volume of a cube with sides of one foot in length.
For example, an Olympic-size swimming pool holds about 88,000 cubic feet of water. The highest release expected for this flood is 150,000 cubic feet per second from Gavins Point Dam, near Yankton, S.D.
Dewater -- The process of removing groundwater or surface water, usually by pumping.
Intentional breach -- The U.S. Army Corps of Engineers sometimes breaches levees to relieve flooding upriver, including to relieve pressure on floodwalls or other structures protecting critical land.
Levee (or dike) -- A constructed slope or wall to keep floodwaters from an inundation area or adjacent land. Can be permanent or temporary and made of earth, concrete or other materials.
Pooling -- As the water table rises with flooding, water can collect in low areas, including near levee bases. Water from pooling is not considered seepage, because it's from the water table or rainwater, rather than a leak through a levee.
Piping -- Erosion along the base of a levee from strong river currents. This can cause failure as the levee foundation deteriorates too far and its structure collapses.
Riprap -- Rock or concrete rubble often placed on shorelines and bridge abutments to prevent erosion from water and ice.
Sand boil -- Sand boils form on levees when water pressing down on the river side pushes water through to the dry side. Not all sand boils are the same:
Carlos Lazo, a spokesman for the U.S. Army Corps of Engineers, said boils leaking clear water are generally routine fixes. However, he said dark water coming from boils indicates sediment erosion and is more serious.
Scour hole: A hollow in the bed of a stream caused by the erosive action of rapidly circulating flow.
Seepage -- Water that travels through or under a levee. Some seepage is considered normal or expected, but too much can indicate big problems within a levee, and lead to breaking.
157000 CFS June 23, 2011DAILY US ARMY CORP OF ENGINEERS RESERVOIR CONTROL CENTER REPORT
150900 CFS June 22, 2011
150000 CFS June 21, 2011
percentage of flood control capacity left in that particular reservoir/lake
66.3% June 23, 2011
62.8% June 22, 2011
51.6% June 21, 2011
52.3% June 15, 2011
KC blogger (hydrologist) who posts these daily
A guide assisting in reading this report:
Located about 19 miles north of Omaha, OPPD’s Fort Calhoun Nuclear Station is designed to withstand severe natural disasters, including:
Omaha Public Power District (OPPD): If you look closely in the photos, our plant, our substation and other buildings are dry behind berms, sandbag walls and AquaDams. The plant is secure from water to the 1,014 feet above sea level elevation (the river is now at 1,006). It also has diesel generators and additional fuel staged to provide power from on site...(read more)
Nebraska Public Power District (NPPD): There have been at least five situations of flooding around the Brownville area since 1952, and Cooper Nuclear Station, which has experienced several floods since it began commercial operation in 1974, was built to withstand various natural disasters, including tornadoes and earthquakes. The site was elevated 13 feet above the natural grade to 903 feet sea level elevation to accommodate the maximum, probable flooding event. (Earlier this week floodwaters came within 18 inches of 902 feet -- the mark at which Cooper would be shut down.)... (read more)
Eastern Montana, the Dakotas, Nebraska and Iowa
Omaha District
http://www.nwo.usace.army.mil/html/op-e/flood.html
Kansas and Missouri
Kansas City District
http://www.nwk.usace.army.mil/Flood/index.cfm
Project Flood for Agenda 21: Army floods, Army buys flooded land
ABC News reports that people are reacting to the Army Corps of Engineers decision to release even more water into the raging river Sunday. Some people in the flooded breadbasket farmlands are also reacting to the federal government mailing letters to them, notifying that the Army Corps of Engineers will buy their all but now ruined land, in what some rights defenders say has hallmarks of United Nation Agenda 21's Wildlands Project that abolishes private property.
Major event about to unfold before your eyes, page 1 - Fort Peck Dam
Fort Peck officials work to stay ahead
Jun. 13, 2011 - The safety of the Fort Peck Dam recently was called into question by a columnist for a St. Louis website. Bernard Shanks, who is writing a book on the hazards of Missouri River dams, posted a column June 7 claiming that there is a possibility of failure at the Fort Peck Dam that could lead to a domino-like collapse of all five downstream dams in the Missouri River Mainstem Reservoir System.
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