Alake has water quality as follows: dissolved oxygen, 60; nitrate, 6.10 (mg/l); phosphate, 0.8 (mg/l); and ph, 5.5. answer the following: what is the wqi of this water if the weighting factors of the corresponding water quality parameter are 0.3, 0.2, 0.2, and 0.3, respectively? what is the wqi of this water if the weighting factors of the corresponding water quality parameter are 0.5, 0.2, 0.2, and 0.1, respectively? why are they different? how would one determine the weighting factors of each water quality parameter?