In a recent judgment of this Court in Essco Fabs 2008 Indlaw SC 2494 (supra),(2009) 2 SCC 377,this Court,after considering previous judgments as also the provisions of S.17 of the Act held: "Whereas sub-s.(1) of S.17 deals with cases of "urgency",sub-s.(2) of the said section covers cases of "sudden change in the channel of any navigable river or other unforeseen emergency".But even in such cases i.e.cases of "urgency" or "unforeseen emergency",enquiry contemplated by Section 5-A cannot ipso facto be dispensed with which is clear from sub-s.(4) of S.17 of the Act