Calculation of Potential Groundwater Resources in Orkhon River Basin

Available groundwater research work and data levels are very limited due to the wide territory of our country. Potential Groundwater resources need be calculated by basin implement Integrated Water Resources Management Plans. For this purpose, previously calculations were done twice in Orkhon River Basin. The last calculation was 10 years ago, therefore Plan needs redeveloped, using updated levels. is one biggest rivers Mongolia, rising from Khangai Mountain Range flowing into Selenge River. Basin includes Tuul, Kharaa, Yeruu basins which rise Khentii Mountains. first time, a hydrogeological structure map developed analyzed systemized structure, morphostructure factors, hydraulic properties formations distributed There two types three massifs basin. This paper presents (PGR) based on well data, reports exploration works, maps at scale 1:500,000. As result calculation, there 1.99 km3 PGR basin.The largest found linear intermountain occupies 98 percent total PGR. Further improvement quality standards water remains an important issue for hydrogeologists today.