In assessing the compensation to be paid by the acquiring authority under this Act regard shall be had not only to the extent (if any) to which the value of the land in or over which the right is purchased is depreciated by the purchase but also the damage, if any, to be sustained by the owner of the land by reason of injurious affection of other land of the owner by the exercise of the right. The modifications subject to which subsection (1) of section 44 of the