106. The rent payable by a raiyat in respect of a holding may be reduced on one or more of the following grounds, namely:- (a) that the rent payable by the raiyat is substantially higher than the rent calculated at the rates of rent determined under this Chapter for similar classes of land in the unit in which the land comprised in the holding is situated and entered in the table of rent-rates, confirmed under section 101, applicable to such unit; (b) that the soil of the holding has deteriorated as a result of the deposit of sand or through the operation of other natural causes, sudden or gradual; and (c) that there has been any breakdown of the existing arrangements for irrigation or drainage or for the maintenance of any embankments or bunds which were in existence at the time when the rent was last settled, and the soil of the holding has thereby deteriorated.