BUREAU OF INDIAN STANDARDS INDIAN STANDARD CRITERIA FOR DESIGN OF CANAL HEAD REGULATORS IS 6531:1994 INDIAN STANDARD CRITERIA FOR DESIGN OF CANAL HEAD REGULATORS IS 6531:1994 - - NEW DELHI BIS 2004 - 38 Subjects--Topical Terms: CIVIL IS 6531:1994 IS 7784:1996 Dewey Class. No.: 627.13 BIS / BUR