Ghaghra Flood Forecast: Shelter Choice 60 Hours Before the Peak
A village panchayat of 1,300 people lies on the left bank of the Ghaghra in Gonda district, behind a 4.5 km earthen embankment built in 1998. The embankment breached in 2016 and again in 2020; after each breach the village was rebuilt in the same place because the farmland is there, while the government resettlement site is 3 km away on higher ground. On 8 August the Central Water Commission forecasts the river to cross the danger level within 60 hours and to peak about 1.5 m above the embankment crest. The village has one pucca school with a 1.2 m plinth and three rooms, a hand pump on a 0.6 m platform, 260 cattle, and 41 families with at least one member over 70 or under 5. The panchayat pradhan says nobody will go to the resettlement site. You are the BDO and must decide where people and livestock will be sheltered.
1. With 60 hours left, decide the shelter plan. Show the arithmetic behind your decisions and how you split the population.
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Start with the arithmetic. The forecast peak is 1.5 m above the crest; the school plinth is 1.2 m. The school therefore goes under by about 30 cm, and the hand pump at 0.6 m goes under by 0.9 m. Three rooms cannot hold 1,300 people in any case. So the school is a store, not a shelter - move the mid-day meal grain to a raised platform or a neighbour's roof and keep it dry.
Shelter split:
- Wave 1, first 24 hours: the 41 families with a member over 70 or under 5, plus pregnant women and the sick, moved to the resettlement site by tractor trolley, with a register and a named caregiver for each elderly person.
- Wave 2, 24-48 hours: the remaining people to the nearest high ground, in clusters of 10-15 households with one volunteer each.
- Livestock, 260 head: to separate high ground, never onto the embankment crest. Trampling destroys the grass cover and starts the piping that caused the 2016 breach.
Cut-off: stop road movement 12 hours before the peak; after that, boats only.
2. The pradhan wants the embankment raised by 1 m before the next monsoon instead of moving the village. Evaluate this as a disaster risk reduction choice and propose a better mix.
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Why raising the embankment is the weakest option:
- It shifts risk rather than reducing it. A higher crest holds water higher and longer, and a breach, when it comes, is deeper and faster - what is called the levee effect.
- It creates false security. Once the bund looks higher, new houses come onto the floodplain, so exposure grows faster than the protection does.
- The two breaches point to a maintenance and piping problem - burrows, cattle on the crest, poor grass cover, blocked outlets - as much as a height problem. Adding height does not fix piping.
A better mix:
- Maintain what exists: grass cover, no cattle on the crest, rodent control, working outlets.
- Non-structural: zoning that bans new construction on the floodplain, raised plinths, a flood-proof grain store, and a gauge-based early warning sent to the pradhan's phone.
- Livelihoods: livestock shelters on high ground.
- Relocation: a voluntary, phased package that includes land near the resettlement site, not a forced move.
Structural plus non-structural measures together, not either one alone.