possible floods, on the land or danger of erosion of such land,, 566 (c) The benefit the owner is likely to derive in respect ,of his other lands in the area due to the control measures,, (d) The damage sustained by the person interested by reason of the taking of any standing crops or trees which may be on the land at the time of the Collector taking possession thereof (2) For building or structure, if any, a sum equivalent to the sale proceeds of the materials of the same plus 15 per cent thereof: Provided that if in lieu of this compensation the owner chooses to take away the materials the Collector shall allow him to do so within such time as specified by him and the cost of the shifting of the buildings or structures as the case may be, as may be approved by the Collector in the manner prescribed shall be borne by the Government, which cost however, shall not exceed 20 per cent of the value of the buildings or structures as the case may be as determined by the Collector.