User:Rocka1994/sandbox

Oroville Dam update of Spillway.

On February 7, 2017, during ongoing flood control release of about 50000 cuft/s a crater appeared in the Oroville dam spillway. Due to continual high inflows to Lake Oroville, dam operators had no other alternatives but to continue using the damaged spillway. Attempts went underway to try and prepare the never before used Emergency Spillway as water levels continued to rise while the damaged spillway was in continual use. Power transmission lines were moved, and workers began clear cutting trees within the emergency spillway, which flowed down a hillside. Damage from the spillway crater earlier throughout the event was carried down stream, and caused damages to a nearby fish hatchery, state workers began evacuating fish and eggs from the hatchery in an attempt to lessen damages. By February 10, the hole had grown to 300 ft wide, 500 ft long and 45 ft deep. Although Engineers had hoped that using the damaged spillway may drain the lake enough to allow for the emergency spillway to not be used, the inflow of water ended up being to much. On February 11, 2017 Lake Oroville hit the overflow mark of the emergency spillway, which until then, had never been used since the dam's construction in 1968. Because the spillway is a separate structure from the dam, there wasn't any real danger of the main embankment being breached. The dams structure itself continued holding and not damages were found, the possible evacuation of Oroville itself was also negated as the residents were still safe. However, once the lake rose to the level of the emergency spillway, it created an uncontrolled overflow, although attempts to prepare the emergency spillway to lessen damages were made, due to the emergency spillway emptying directly onto a hillside, substantial debris is expected to be eroded and carried into the river.

When responding to talk : is needed per response. So first response, :, someone responds to that (so a responses response) then ::

It is also necessary to end with Rocka1994 (talk) 21:27, 11 February 2017 (UTC) this puts user name in a time-stamp. in source adds a citation needed.