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Multivariable relationship with the change of sulfate concentration and dynamic model for the water demand of the Huambi parish, Ecuador, South America

Abstract:

The growing population has generated the need for a greater amount of agrarian, water and land resources, this work present dynamic modeling that allows knowing the supply and demand of water for agricultural use in function to the population growth of the parish Huambi in Ecuador, South America. To the year 2039, there will be a water demand of 225,000,000 m3 year-1 which should satisfy an approximate population of 6,000 farmers. However, by 2021, the offer will not cover the existing demand. In addition, correlation studies of the RAS vs Mg+Bicarbonate, RAS vs Ca+Bicarbonate, RAS vs ISP, RAS vs EC+STD, of which the highest correlation was that of RAS vs EC+STD with a ratio of 0.8596, also determinate that the river has a stronger correlationship between RAS and Ca+Bicarbonate than the one with magnesium. The potential salinity index (SP) shows values of 3.0 indicating that the water is optimal for irrigation. The low values in the sodium absorption ratio indicate a low probability of sodium exchange. Using the procedure of the US Department of Agriculture where the EC relates to the sodium adsorption ratio allow the results to be located in the C1S1 field, which corresponds to the water bodies of very good quality for irrigation. In conclusion, it was determinated that the water of the Arapicos River is suitable for irrigation, highlighting in all indicators used, despite its high quality this river is close to an excess of demand or shortage.