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”
During a global seminar held on Feb. 25-26, 2017 in Patna experts from across the country have advocated an “urgent review” and comprehensive study of the Farakka dam to revive the Ganga river. The experts were discussing various concerns facing River Ganga and the possible solutions for them. The seminar titled as “Incessant Ganga” was organised by Bihar’s Water Resources Department, almost week after, Bihar CM Nitish Kumar has openly termed the barrage as genesis of floods in the State. Speaking in the program, the CM again expressed deep concerns behind receding water flow in the Ganga and increasing silt deposit due to Farakka dam.
Speaking during the seminar, environment expert Himanshu Thakkar the coordinator of SANDRP advocated urgent need for review of Farakka barrage claiming that it has failed to fulfill any of the purpose – irrigation, hydro electric power, water supply – of the barrage for which it was built. As per, Himanshu Thakkar the dam was built to maintain the navigability of Kolkata port.
Thakkar also suggested that the gates of Farakka be opened during monsoon to mitigate the intensity of floods in Bihar. As per Thakkar there was an urgent need for a comprehensive study of the Farakka barrage to find out its achievements or whether the barrage fulfilled its objectives. The committee constituted for study must include the Centre, Bihar, West Bengal and all states having Ganga, he said adding that a study should be made on the social and livelihood impact of the barrage, how it affected people’s lives, whether its existence was justified and cost-benefit assessment among other issues.
Finally the Oroville Dam spillway damage has turned into a disaster. Report at this time (01:00pm, Feb. 13, 2017) finds dam level rising about 1 feet above the danger level. Water currents have started pouring out all over and around the emergency spillway which has never been put in use for last half a century. Meanwhile, more water is gushing in the dam reservoirs due to recent heavy rainfall in catchment areas upstream. Continue reading “DRP News Bulletin 13 Feb 2017 (Oroville Dam Disaster, USA: A Wake up Call for India: A Country of aging big Dams)”
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”