Environmental Engineering Reference
Electrical Conductance(microhms/cm) at 25 C
Fig. 7 RatingofgroundwatersamplesonthebasisofECand%Na(AfterWilcox 1955 )
post-monsoon seasons. According to the Richards ( 1954 ) classification based on
SAR values, all samples belong to the excellent category in the study area (Table 2 ).
SAR can indicate the degree to which irrigation water tends to enter cation exchange
reactions in soil.
relative concentrations of bicarbonate and carbonate as compared to those of cal-
cium, magnesium and sodium instead of the absolute bicarbonate and carbonate
good for irrigation (Table 2 ). Based on this classification, 56 % and 44 % samples
are good and doubtful category in pre-monsoon, whereas in post-monsoon 100 %
groundwater samples are of good category.