Sentences with phrase «main spillway»

Round the clock hardening of the main spillway breach and the emergency spillway erosion continue, preparing for oncoming rains.

Experts are reporting in California that the Oroville Main Spillway needs fixed by November 2017 for the next upcoming water year or failure will «pose significant risks».

OR will downstream Oroville, Biggs, Gridley, Live Oak on down to Yuba City be inundated by catastrophic Oroville dam breaches following main spillway and / or emergency spillway breaches?

The main spillway is made to fail but to «fail safe».

What made it an anomaly or outlier is that multiple events all happened simultaneously (early, heavy rains; blocked penstock; un-repaired main spillway; unreinforced foundation to emergency spillway wall; transmission line towers on downslope that could have been washed out).

Authorities urgently began emergency drawdown through the main damaged spillway, sacrificing the main spillway's lower portion to prevent a worse failure and breach of the emergency spillway.

But the recent visual inspection by a team of experts reported in newspapers reported that water is flowing long after the spilling from the dam has stopped reportedly from what appears to be under the main spillway.

Yet the main spillway failed at some 10 - 15 % of the peak spillway flow.

Oroville engineers appear to have been concerned over the main spillway eroding back upstream towards the main dam — so risking using the untested «emergency spillway» — but that was worse.

Dam engineers in California stated they had never experienced the confluence of such events (record rainfall, busted main spillway, blocked penstock through power station and threat of emergency spillway collapse).

The main spillway at Oroville Dam is riddled with design flaws and so badly damaged that an independent panel of experts hired by the state has concluded it's probably impossible to repair the structure completely before the next rainy season begins in November....

According to California officials the Oroville Dam main spillway was designed to fail in the case of a peak event.

Fearing further damage and failure of Oroville's main spillway, authorities instead allowed Lake Oroville to rise to overflow Oroville Dam's emergency spillway (Nazarian A. 2017).

You ignore the multiple failures of the main spillway, the emergency spillway and blockage of the hydropower flow etc..

Having to close the main spillway seems a bit unfortunate but nothing to do with the hydrology or the spectre of mega-floods.

Not exact matches

Water levels fell to a point at which little or no water flowed out of the emergency spillway, which Orrock said was the main factor in its erosion.

Dominating the main central channel, the ancient spillway gates hold back a vast manmade reservoir, and can still be opened in order to flush the Stormgracht.

The marvelous California Spillway Risk Analysis was completely undermined by inadequate construction of both the main and emergency spillways, lack of aeration retrofit (though implemented on other dams), lack of maintenance, and fragile power line design.

The USBR had computer dam failure models in the 70's; these should be invaluable in evaluating the failure of either emergency spillway or the main; as they considered the strength of the underlying material.

Why then did both main and emergency spillways fail though the PMP methodology was not exceeded?

How practical is it to design main and emergency spillways for an ARkStorm?

Robert I. Ellison The combined main and emergency spillway design flows appear to be 750,000 cfs.