The California floods saw the Oroville dam overflowing , while elsewhere in California excess water became a sight not often seen in this arid part of the western United States. Two years later in February , after a series of storms hit northern California, the epic sight returned to Lake Berryessa. This singular drainage system shaped like a funnel is located in the Monticello Dam, built between and in the Berryessa Valley, in Napa Country. Monticello Dam, with the Morning Glory Hole spillway usbr.
Giant 'Glory Hole' sucks in rainwater as storms swell California lake
Giant 'Glory Hole' sucks in rainwater as storms swell California lake | US news | The Guardian
For most of the year, the largest lake in Napa County, California , looks like any other lake. This beautiful reservoir in the Vaca Mountains — created by the hydroelectric Monticello Dam — is, on any given sunny summer day, full of swimmers, fishermen, water skiers, kayakers, canoers, and other boaters. And when the water is high, it turns into an enormous, mesmerizing whirlpool. Part of its construction involved designing a spillway a controlled release valve for excess water. The spillway design chosen for Berryessa is variously called a bell-mouth, a morning glory, or — most commonly — a glory hole.
The spectacular 'Glory Hole' spillway in Monticello Dam, California
Some say it looks like a toilet being flushed; in more generous interpretations, it is a beautiful inverted fountain. In a rare occurrence, the water level in the Lake Berryessa reservoir, 75 miles north of San Francisco, has risen so much that it is pouring into a ft-deep circular pipe constructed in its corner. The 72ft diameter pipe, known as Morning Glory Spillway, or simply Glory Hole, takes in water like a drain, once the reservoir is filled over capacity, and shoots it into a creek below the Monticello Dam. Northern California has seen heavy precipitation for weeks.
A glory hole in the context of the offshore petroleum industry is an excavation into the sea floor designed to protect the wellhead equipment installed at the surface of a petroleum well from icebergs or pack ice. An economically attractive alternative for exploiting offshore petroleum resources is a floating platform ; however, ice can pose a serious hazard to this solution. While floating platforms can be built to withstand ice loading up to a design threshold, for the largest icebergs or the thickest pack ice the only sensible alternative is to move out of the way. Floating platforms can be disconnected from the wellheads in order to allow them to be moved away from threatening ice, but the wellhead equipment is fixed in place and hence vulnerable. The keel of an iceberg or pack ice can extend far below the surface of the water.