| # | Factor | Condition | Rank | Corresponding value |
| 1 | Construction costC | High construction cost (>700 USD/m3/d) | L | 1 |
| Moderate construction cost (700 - 400 USD/m3/d) | M | 2 | ||
| Low construction cost (<400 USD/m3/d) | H | 3 | ||
| 2 | Operation and maintenance costsC | High cost (>3 USD/m3/d) | L | 1 |
| Moderate cost (3 - 0.5 USD/m3/d) | M | 2 | ||
| Low cost (<0.5 USD/m3/d) | H | 3 | ||
| 3 | Cost of the required area of land | High cost | L | 1 |
| Moderate cost | M | 2 | ||
| Low cost | H | 3 |