Dam Release, a Repaired Bridge and a Rumour of Breach
You are Collector of a Narmada sub-basin district. The meteorological department forecasts 72 hours of heavy rain. The irrigation department reports the dam at 88 per cent of capacity; its rule curve requires a release at 92 per cent, and inflow is rising. A release of 60,000 cusecs would inundate parts of 38 villages with about 22,000 people. Two relief camps can hold 3,000 people. The bridge on the only evacuation route from 11 of those villages is under repair and will be passable for light vehicles only for the next 36 hours. Farmers and fisherfolk downstream oppose any release, saying it will destroy standing crops. A social media video claims the dam has already breached and is spreading rapidly, though the dam is intact. The irrigation department wants the release ordered within 12 hours.
1. What decision sequence would you follow in the next 12 hours?
Read the worked answer
The sequence should be verify, warn, evacuate the most exposed, then release on the rule curve. First, verify the dam's structural status and the inflow forecast with the irrigation department's engineer in writing, and confirm the bridge's usable window with the PWD. Second, issue a graded warning to the 38 villages, starting with the 11 beyond the bridge, and activate camps. Third, begin evacuation of the elderly, children, pregnant women and livestock from the lowest-lying hamlets within the 36-hour bridge window, using the camps and agreed temporary shelters on higher ground. Fourth, order the release once downstream warning is confirmed, in a stepped manner rather than a single surge if the spillway allows.
The reasoning is that a rule-curve release is a safety requirement, not a discretionary favour; delaying it to avoid crop damage risks a larger, uncontrolled release. But the release must be paired with evacuation, not announced after it.
2. How would you address the misinformation and the downstream opposition?
Read the worked answer
Counter misinformation with a named, credible source and a fixed update schedule, not with a general denial. I would have the dam's executive engineer and the district disaster management officer give a short recorded statement confirming the dam is intact, with the current water level and the release schedule, and circulate it through local cable, FM, WhatsApp groups of sarpanches and the police control room. A rumour helpline should be publicised, and the video's origin referred to the cyber cell if it is causing panic.
On downstream opposition, I would separate compensation from the release decision. The release will proceed; the assessment of crop and property loss should begin immediately with revenue teams so that relief is not delayed by argument. Farmers' representatives should be told the rule-curve basis and the exact timing. This is accountability under pressure: the officer cannot trade dam safety for popularity, but must be seen to have warned, explained and compensated fairly.
3. What criteria would you use to decide which villages to evacuate first?
Read the worked answer
Evacuation should be prioritised by exposure, vulnerability and access, not by population size alone. Exposure means proximity to the river, low elevation and predicted inundation depth at 60,000 cusecs. Vulnerability means the share of elderly, children, pregnant women, persons with disabilities and households without transport. Access means the bridge window: the 11 villages across the bridge must be moved first because after 36 hours their evacuation becomes far harder.
I would map these three factors onto a simple ranked list and assign each village a nodal officer, a vehicle and a shelter. The camps' 3,000 capacity is insufficient for 22,000 people, so most evacuees must go to relatives or to identified high-ground community buildings; the camps should be reserved for those with no alternative. The criterion is defensible because it is published in advance and applied uniformly, which reduces panic and accusations of favouritism.