Strong links with surface water. The basis of the cooperation is the 1992 Agreement between the Russian Federation and Kazakhstan on the joint use and protection of transboundary waters. Issues of transboundary significance are discussed in the Kazakh-Russian joint commission, and monitoring data is shared in the intergovernmental working group on allocation of flow of the Bolshoy Uzen/Karaozen and Malyi Uzen/Saryozen. The land area requiring irrigation largely depends on the actual availability of river water (depending on the hydro-meteorological conditions), and ranges from some 1,960 ha in wet years to 45,980 ha in dry years. The transboundary Pre-Caspian aquifer (No. Three reservoirs in Kazakhstan are the Sarshyganak (46.85 x 106 m3), the Ajdarchansk (52.3 x 106 m3) and the Rybnyj Sakryl (97 x 106 m3) reservoirs.