One of the main features of the public works system under the Ahoms was Excavation of tanks as they believed that excavating tanks is one of the greatest acts of piety. The tanks are usually very large in dimension and popularly known as s?gar (sea). In Ahom Chronicles it is mentioned that the selection of the site for a proposed tank depended on an expert known as m?tichelek? or the soil tester who undertook a scientific experiment for locating a perennial spring for keeping the water level of the tank constant. Another noticeable feature is that most of the tanks excavated by the Ahom rulers still maintain a water level much higher than the topography of the land around them. 

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