Section 7(1) in Kerala Survey and Boundaries Rules, 1964
(1)In low lying lands and backwaters, the sizes of the theodolite stones shall vary from 150 cm x 20 cm x 20 cm to 250 cm x 20 cm x 20 cm and field stones shall be of dimensions varying from 100 cm x 15 cm x 15 cm. to 200 cm x 15 cm x 15 cm according to the needs of the locality.
