Section 7(2) in Kerala Survey and Boundaries Rules, 1964
(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.
