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What has caused the return of the water hazard is unknwon- What is special is that unlikely events can create catastrophic losses and vulnerabilities with the poor segment of the communities. Issue is to differentiate direct causes and indirect causes of risk. So, one can focus on the real causes in order to prevent negative impacts of the risks, when it wil return a next time. In absence of data or statistical records, it is hardship to predict when the flood in mountain will be back. So, best is to prepare new options and scenario based on modelings. I has been said, it was God event and also people or the engieering works, urbanisms, pilgrims, aged techonologies. all these searches for risks sources are confudig with the risk impacts (direct or secundary). The real concern, according to me is people. Uttarakhand was a disaster made by men. Some, experts started to see the truth and root causes of the disaster- I believe, before the next occurence, they will take the opportunity to re-organize Uttarakhand urbanism and geography according to the numbers and sizes of the villages and municiplaities in relations with these debris and sediments zones aswell as carbages in link to the river channels and flows, so that when there is monsoon or heavy rais i Himalaya, river can expend in the river beds in the valley, which is quite a normal weahter phenomenum, but mainly if there is a municipality service to control the waste and the waste management services, to prevent waste and carbages accumulation, which could create artificial water reservoirs mountains. If no water drainage of the reservoirs is not made, the risk is like dam rupture, under the water elevation, the water pressures and tenses on the debris, garbages, sediments that are components of the reservoirs walls will reached a dangerous limit before the reservoir rupture. Then Uttarhakand gentle river flow can become a real monster.