Identification of trends in rainfall, rainy days and 24 h maximum rainfall over subtropical Assam in Northeast India Identification des tendances dans la pluviosite´, les jours de pluie et les chutes de pluie maximum en 24 h dans l'Assam sub-tropical de l'Inde nord-orientale
Water losses from open pan evaporimeter covered with water hyacinth, an aquatic weed, and from an open pan evaporimeter were compared to find out tentatively, the quantitative effect of water hyacinth canopy on evaporation. It was found that water hyacinth canopy doubles the water losses due to its higher transpiration rate. A quantitative description of water hyacinth canopy and its use in computation of evaporation from large water bodies is outlined.
The rainwater samples collected at Background Air Pollution Monitoring Network stations in India during the year 1979 are analysed for the chemical constituents of precipitation. Tables given, show the concentration of Chloride, Sulphate, Nitrate, Sodium, Potassium and Calcium. As sufficient data for monsoon period (June to September) are available total concentration of above constituents for the above period have been worked out. The mean value of ratio Chloride to Sodium concentrations for monsoon period have also been worked out. The results of analyses are discussed.
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