Classification Diagram Classification Of Groundwater Samples

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The USSL diagram classification of groundwater samples has been shown in figure 8. The samples are classified as C2-S1, C3-S1, and C4-S1 categories. 23 samples (47 percent) were placed in C2-S1 class. The C2-S1 class points to medium saline water and low sodium amount which poses no hazard of sodium exchange for agricultural usage in every type of soils. 45 percent of groundwater samples (22 samples) were in the C3-S1 class, meaning that water is highly saline, sodium is low and there is little hazard of sodium exchange. The remaining 4 samples (8 percent) were classified in the C4-S1 class. Fig 9, shows the spatial USSL Classification diagram of groundwater samples in Sarab plain. The C2-S1 was found in the east part of the study area. In this part of the study area, the aquifer is recharged from streams. Therefore, groundwater quality there has good quality. In the middle part of study area, the groundwater quality is deteriorated due to dissolution of gypsum and salts minerals in Miocene formations, cation exchange and urban wastewater. The C4-S1 was found in the west and north part of the study area and salinity and SAR has increased in the west part of study area due to Talkheh Rud river saline water (Asadollahfardi et al., 2011). Due to insufficiency of absolute concentration of anions and cations for water quality determination in agricultural usages, SAR, PI, KR, MAR, RSC, SSP and EC indices were used as key parameters in this domain. Kelley 's Ratio in the study

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