1.1 List of KPIs and Variables¶
CARL and leakage estimates, however, are computed using a bottom-up CFL approach, first estimating the MNF and legitimate night consumption usages. Hereafter, the apparent losses and unbilled authorized consumptions percentages are subtracted from that share. See more in the individual KPI sections.
It is assumed that KPIs are shown in CFL, whereas variables are not, but exist in the underlying database.
| Table 1. Key Performance Indicators and variables required to be computed in CFL. | ||||||
|---|---|---|---|---|---|---|
| Abbreviation | KPI | Variable | User Input | IWA Variable | Dependency | Note |
| SIV | System Input Volume | Inflow & Outflow time series | A3 | Creates two time series, one daily and one hourly | ||
| BMC | Billed Metered Consumption | Billed Metered Consumption, | A8 | Seasonal Factor | ||
| BUC | Billed Unmetered Consumption | Billed Unmetered Consumption, | A9 | Seasonal Factor | Default either 0 or ignored | |
| BAC | Billed Authorized Consumption | A10 | BMC, BUC | |||
| UMC | Unbilled Metered Consumption | Unbilled Metered Consumption, Seasonal Factor | A11 | Seasonal Factor | Default either 0 or ignored | |
| UUC | Unbilled Unmetered Consumption | Unbilled Unmetered Consumption, Seasonal Factor | A12 | Seasonal Factor | Default either 0 or ignored | |
| UAC | Unbilled Authorized Consumption | α (percentage of SIV that results in the UAC) | A13 | SIV (daily) | Two versions exist, IWA-version currently ignored. | |
| AC | Authorized Consumption | A14 | BAC, UAC | |||
| WL | Water losses | A15 | SIV (daily), AC | |||
| UC | Unauthorized Consumption | Unauthorized Consumption | A16 | Default either 0 or ignored | ||
| CMI & DHE | Customer Meter Inaccuracies & Data Handling Errors | Customer meter inaccuracies & data handling errors | A17 | Default either 0 or ignored | ||
| AL | Apparent Losses | β (percentage of SIV that results in the AL) | A18 | SIV (daily) | Two versions exist, IWA-version currently ignored. | |
| RL | Real Losses | A19 | WL, AL | |||
| RW | Revenue water | A20 | SIV (daily), BMC, BUC | |||
| NRW | Non-revenue water | A21 | SIV(daily), RW | |||
| MNF | Minimum night flow | SIV (hourly) | ||||
| ANF | Average night flow | SIV (hourly) | ||||
| ZNC | Zone Night Consumption | Zone Population, Legitimate Night Consumption, Number of Special Users, Special Users Night Consumption | Seasonal Factor | |||
| CARL | Current annual real losses | α (percentage of SIV that results in the UAC), β (percentage of SIV that results in the AL) | MNF or ANF, ZNC | |||
| UARL | Unavoidable annual real losses | Length of mains, Number of service connections, Length of service pipes, average zonal pressure | ||||
| ILI | Infrastructure Leakage Index | CARL, UARL | ||||
| LeakService | Leakage (per service connection) | Number of service connections | CARL | |||
| LeakMain | Leakage (per km main) | Length of mains | CARL | |||
| LeakAvg7Day | Leakage (weekly average) | CARL | ||||
| LeakDIFF1M | Leakage Difference 1 month | CARL | ||||
| LeakDIFF3M | Leak Difference 3 months | CARL | ||||
| LeakDIFF6M | Leakage Difference 6 months | CARL | ||||
| LeakDIFF12M | Leak Difference 12 months | CARL | ||||
| LostRev | Lost revenue | Production Cost | CARL |