An Act amending the act of August 6, 1936 (Sp. Sess., P. L. 95, No. 38 1/2), entitled "An act to authorize and empower cities, boroughs, towns, and townships, separately or jointly, to provide for protection against floods by erecting and constructing certain works and improvements, located within or without their territorial limits, and within or without the county in which situate;....," further regulating purchases and bidding on such purchases; and providing a penalty.