§ 7-724 Official maps, changes in official map; notice of hearing. Every village may by resolution of its board of trustees establish an official map of the village showing the streets, highways and parks theretofore laid out, adopted and established by law. Drainage systems may also be shown on this map. Such map is to be deemed to be final and conclusive with respect to the location and width of streets, highways, drainage systems and the location of parks shown thereon. Such official map is hereby declared to be established to conserve and promote the public health, safety and general welfare. The clerk of every village which has established such an official map shall immediately file a certificate of that fact with the clerk or register of the county in which said village is located. Such board of trustees is authorized and empowered, whenever and as often as it may deem it for the public interest, to change or add to the official map of the village so as to lay out new streets, highways or parks, or to widen or close existing streets, highways or parks. There shall be a public hearing on any proposed action with reference to any such change in the official map. Before making any such addition or change the board of trustees shall refer the matter to the planning board for report thereon, but if the planning board shall not make its report within thirty days of such reference, it shall forfeit the right further to suspend action. Such additions and changes when adopted shall become a part of the official map of the village, and shall be deemed to be final and conclusive with respect to the location of the streets, highways and parks shown thereon. The granting by the board of trustees of a petition for the approval of the laying out, altering, widening, narrowing or discontinuing of a street, shall be deemed to be an addition or change of the official map and shall be subject to all the provisions of this article with regard to such additions or changes. Drainage systems may also be shown on this map.