excavators think that Stage I of the city was a small fortress under the Stage III citadel; if that is right, it suggests the place was founded as an outpost by a political power based elsewhere. Perhaps that same power or its local representative was responsible for the plan of the larger city.
The citadel has yielded an intricate network of storm water drains, all connected to an arterial one and furnished with slopes, steps, cascades, manholes (air ducts / water relief ducts), paved flooring and capstones. The main drains were high enough for a tall man to walk through easily. The rainwater collected through these drains was stored in yet another reservoir that was carved out in the western half of the bailey.Altogether the reservoirs have an area of about 10 hectares, or 10 percent of the area within the walls. This fabulous system made it possible for the Dholavirans to thrive in their desert home.
suggested that it says CONSERVE WATER.