The Tanks :

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              The sea like tanks such as those in as Sivasagar, Joysagar and Gaurisagar set apart, There were around three hundred tanks of comparatively smaller size dug at different places during the period of Ahom rule. Not only the king, even high officials were in the habit of making rounds and tanks for public use, and they were named after the persons involved. Unfortunately more than half the number of these tanks is now extinct, some are ill-maintained and only a few are still in public use.
              One thing, however, is deserved to be taken note of in regard to the tanks of the Ahom period. These tanks were actually not dug in the real sense of term. Rather an indigenous method was employed to locate water spring, and once such a spring was discovered, the banks were raised leaving big water full ditches on all sides. Then the springhead was cleared for a free flow of water, but at the same time, a long piece of hard timber was thrust into the mouth of the spring as a measure for controlling the flow. A mercury like chemical substance was poured into the mouth of that spring to get transparent, clear water. It is believed that the ditches around the tank have a bearing upon maintenance of the water level of the tank.