The deterioration of the flood scene in Lakhimpur district following release of excess water from the Ranganadi dam has once again raised serious questions over the viability of mega hydel projects without assessing their downstream impacts as also the very idea of constructing such projects on the Himalayan biodiversity zone. "The Centre's grandiose plans of generating hydro-electricity through big dams in Arunachal Pradesh completely ignore the immense dimensions of the issues involved.