As per reports, the bridge / flyover collapse leading to 18 deaths was due to issues involving design, quality, barrication, supervision. Proper records and checklist were not maintained making it difficult to ascertain the material used for concreting. Pour card filling is to be done so that all details like area of work, ratio of cement, sand, water used, status of shuttering etc will be noted and signed by all concerned.
https://www.firstpost.com/india/varanasi-flyover-collapse-initial-probe-identifies-6-lapses-in-construction-advises-strict-action-against-high-ranking-officials-4474481.html