1. Constant
1.1. Mass constants
1.2. Volume constants
1.3. Molecular constants
1.4. Unit equivalents
2. Conversion
2.1. Convert temperature values
2.2. Factor correction salinity
3. Indicators
3.1. Physical
3.1.1. Turbidity
3.1.2. Color
3.1.3. pH
3.1.4. Temperature
3.1.5. Specific conductace
3.1.6. Total solids
3.1.7. Total dissolved solid
3.1.8. Total dissolved salts
3.2. Chemical
3.2.1. Chloride (Cl)
3.2.2. Ammonia + NO3-N
3.2.3. Sulfate (SO4)
3.2.4. Manganese (Mn)
3.2.5. Arsenic (As)
3.2.6. Floruide (F)
3.2.7. Nitrate (NO3)
3.2.8. Copper (Cu)
3.2.9. Zinc (Zn)
3.2.10. Potassium (K)
3.2.11. Nickel (Ni)
3.2.12. Chromium (Cr)
3.2.13. Lead (Pb)
3.2.14. Dissolved oxygen (O2)
3.2.15. Ammonium (NH4)
3.3. Bulk
3.3.1. Hardness
3.3.2. Alkalinity
3.3.3. BOD5
3.3.4. Orthophosphates
3.3.5. Total phosphorus
3.4. Biological
3.4.1. Fecal coliform
3.4.1.1. E. Cole
3.4.1.2. Coli
4. Quality Index
4.1. Oregon WQI
4.1.1. Sub-index function
4.1.2. Aggregation function
4.1.3. Quality classification
4.2. Aquatic Toxicity Index
4.2.1. Sub-index function
4.2.2. Aggregation function
4.2.3. Quality classification
4.3. Weigthed Arithmetic WQI
4.3.1. Quaility Rating Scale
4.3.2. Sub-index function
4.3.3. Weightage
4.3.4. Proportional constant
4.3.5. Aggregation function
4.3.6. Quality classification
4.4. Overall Index of Pollution
4.4.1. Sub-index function
4.4.2. Aggregation function
4.4.3. Quality classification
4.5. Dinius WQI
4.5.1. Sub-index function
4.5.2. Weightage
4.5.3. Aggregation function
4.5.4. Quality classification
5. Quality Index Abstract
5.1. Sub-index function
5.2. Aggregation function
5.3. Quality classification
6. Aggregation
6.1. Weighted
6.1.1. Arithmethic mean
6.1.2. Geometry mean
6.1.3. Harmonic mean
6.2. Unweighted
6.2.1. Arithmetic mean
6.2.2. Geometry mean
6.2.3. Harmonic mean