Section 7 in Kerala Survey and Boundaries Rules, 1964
7. Survey marks in special tracts.
(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.(2)When water in low lying lands and backwaters is too deep even for stones of the sizes mentioned in sub-rule (1) , a\hard and stout coconut stem with the coconut tree mark painted in tar on the side near the top, shall be planted firmly so that a length of at least one metre may be buried under the ground and a length of above 50 cm. may be visible above high water level.(3)In exceptional cases, where survey marks of the prescribed quality and dimensions cannot be obtained at reasonable cost, the Director of Survey and Land Records shall for reasons to be recorded in writing suitable survey marks.
