(1) Such award shall be filed in the Collector's office and shall, except as hereinafter provided, be final and conclusive evidence, as between the Collector and the persons interested; whether they have respectively appeared before the Collector or not, of the true area of the land, the nature of the said obstruction from which the land is to be kept free, the damage caused or to be caused under section 6, the value of the rights restricted under section 7 and the apportionment of the compensation among the persons interested.
     (2) The Collector shall give immediate notice of his award to such of the persons interested as are not present personally or by their representatives when the award is made.