I woul like help calculating the sub-index scores (pi) of pollutant in order to obtain the sub-LPI value for an leachate. I managed to understand how to obtain the term wi, the weight for the ith pollutant variable. However a coud not understand the pi, the sub-index score of the ith leachate pollutant variable.
Honoria Fatima Gorgulho obtaining the sub-index scores of pullutant in order to obtain the sub LPI valvue for an leachate one should follow this SOP:
1) Determine the concentration of the pollutant in the leachate.
2) Consult the standard curves or tables provided in the LPI calculation method to find the corresponding sub-index score (pi) for that concentration.
3) If standard curves or tables are not available, use interpolation or extrapolation techniques to estimate the pi value based on the available data and the curve's trend.
4) Repeat steps 2 and 3 for all the pollutants considered in the LPI calculation.
5) Use the calculated pi values and their corresponding weights to calculate the sub-LPI value for the leachate.
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