 Because the Nagymaros works were not built, the Gabčíkovo power plant cannot work at peak efficiency, which causes appreciable economic damage.Non-existence of Nagymaros dam also causes main obstacle of inland navigation on the 2400 km Danube Pan-European corridor due to low levels of water.Hungary requests Slovakia to manage regulation works on problematic stretch of Danube that had to be solved by Nagymaros backwater.