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Considering the water restrictions, it is important to check the water balance in each area. These restrictions are even more important in arid and semi-arid regions. The purpose of this study was to study the water balance in the Kalacho plain of Kohgiluyeh city. Kalacho plain is about 15 km east of Dehdasht city. In recent years, due to the excessive extraction of lowland wells, the quality of groundwater has also declined steadily. Therefore, hydrogeological assessment and aquifer management seems necessary. Groundwater management requires understanding and functioning of the aquifer under natural conditions (firstly) and then predicting the effects of harvesting or feeding. Undoubtedly, understanding the actual behaviors of a natural system requires some research for each particular area. The average annual temperature and precipitation in the meteorological stations is about 18.1 °C and 394 mm, respectively. The water crisis map of this plain has been prepared based on the data of 45 km area during the 1991-1992 blue water year. Groundwater Balance Range of the Kalacho Plain is selected based on available statistics and distribution of piezometers, wells and agricultural areas. According to the long-term hydrograph, the plain faces an average loss of 0.15 m and a reservoir deficit of 2.5 million m. Also during the 20-year period, a total of 24 m of drop and 68 million cubic meters of reservoir deficits were created in the plain. By calculating the effective parameters in the general water balance equation (inputs and outputs), the plain was finally divided into five critical areas. Zones 1, 2 and 3 are the most critical lowland areas in the vicinity of the hydraulic connection with the Gachsaran Fm., and areas 4 and 5 are less critical because of the adjacent Asmari Formation, which feed on this karstic aquifer. Overall, this negative balance indicates an increasing drop in groundwater level and its reservoir deficit.

Investigation of Water Balance and Map Crisis Preparation in the Recent Two Decades of Kalacho Plain, Dehdasht, Iran