Dam Safety

Oroville Dam damage in US: Many questions

USA’s tallest, Oroville Dam on Feather river in California suffered severe spillway damage, as discovered on Feb 7, 2017. As we wrote in our blog “Oroville Dam Spillway Damage in USA: Worst is yet to come”[i] on Feb 12, 2017, worse was yet to come, but the author did not imagine the threat would materialize so soon. Here we try to capture the key events since that blog. Continue reading “Oroville Dam damage in US: Many questions”

Dam Safety

Oroville Dam Spillway Damage in USA: Worst is yet to come

Oroville Dam, the tallest Dam in USA was found to have suffered severe damage to its spillway on Feb 7, 2017. A crater of about 180 feet width, 250 feet length and 30 feet depth was found in lower portion of the 3000 ft long spillway on Tuesday when 55000 cusecs (cubic feet of water) was flowing down the spillway.

That water release down the damaged spillway was stopped the same day. But the water level in the Oroville dam was than already over 80%, fast climbing to over 90% by the evening of Feb 9, 2017 and with inflow of 128000 cusecs on Feb 7, rising to 191000 cusecs on Feb 9, the officials of Department of Water Resources (DWR) of California decided to first test the damaged spillway by releasing 20000 cusecs twice on Feb 8, 2017. This further damaged the spillway, increasing the depth of the crater to upto 300 ft as per some reports and not only increasing the length and width, but also eroding the adjoining hills. Continue reading “Oroville Dam Spillway Damage in USA: Worst is yet to come”