The adjustment values were based on "weights" defined in the National Sanitation Foundation Water quality Index (ICA-NSF). The index sets itself to zero if the concentration of some toxic substance exceeds the maximum allowed limit. The index includes the following parameters: dissolved oxygen percent saturation, pH, nitrate concentration, total phosphorus concentration, chemical oxygen demand, concentration of suspended solids, electrical conductivity and temperature. In this process, the following criteria were used as a reference: WQI from the National Sanitation Foundation, WQI for the Des Moines River, Escribano and De Frutos WQI, the international legislation on maximum acceptable concentration for different water quality variables, and the authorsÂ’ personal criteria. The index was developed in four steps: parameter selection, assignment of parameter weight, transformation of data to their corresponding sub indices and selection of an appropriate aggregation function. The goal is to preserve their natural role for native plants as well as migrants and local animal species. We propose ICA-L, a wetland physicochemical water quality index (WWQI), to be used as a management tool for seasonal-flooding lagoons in Palo verde National Park, Guanacaste, Costa Rica. Physicochemical water quality index, a management tool for tropical-flooding lagoons.
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