The island was surveyed as the possible water source several times, including in 1939, 1976 and 1981. Some studies showed that this is feasible, and that Ranney collectors, or other types of wells, can be built. However, the studies also showed that the yield would be negligible regarding the total water consumption in the city and that construction of the collectors and wells would be too expensive for the amount of water which will be produced. When flooded, the island can be buried under up to of water, which would damage to wells. Also, the water drained this way also drains the sewage soiled water either from the Danube or from the arm between the island and the land where city sewage empties. Some labeled the sudden interest in the island as a way to divert highly negative public reaction to the Makiš decision.