Evaluation Of Groundwater Quality For Irrigation Suitability In Thimmajipet Mandal, Mahabubnagar District

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D. VASU*, S.K. SINGH, P. TIWARY, P.S. BUTTE AND V.P. DURAISAMIa

ICAR-National Bureau of Soil Survey and Land Use Planning, Amravati Road, Nagpur-440 033 a Directorate of Natural Resource Managment, TNAU, Coimbatore – 641 003.

ABSTRACT

Georeferenced groundwater samples collected from Thimmajipet mandal, Mahabubnagar district were analyzed and evaluated for their suitability for irrigation. Out of 49 samples, 12 per cent samples recorded pH > 8.5 and electrical conductivity varied from 500 to 5130 µS cm-1. All the samples have high Mg2+ content and 92 and 94 per cent samples have high Ca2+ and Na+, respectively. Among the total groundwater samples 59 per cent have high sodium hazard, 80 per cent with high magnesium hazard, 7 per cent with high Mg/Ca ratio and 100 per cent with very high permeability index. Water samples were classified as C3S1 (29%), C3S2 (39%), C2S2 (2%) and C2S1 (4%). In general, the groundwater in Thimmajipet mandal is unsafe for long-term irrigation use.

KEYWORDS:

Groundwater quality, Irrigation suitability, Permeability index, Sodium hazard.