Measurement of the performance of water supply

Water quality

Definition:

Combining the performance of bacteriological and physical /chemical tests on the basis of comparative coefficient 75:25.

Performance coefficient by category: 25%

Calculation:

 [ U.1.A.01 x 0.75 + U.1.A.02 x 0.25] x 25%

Pressure

Definition:

Percentage of intact properties of pressure falling below the minimum pressure levels and physical /chemical performance tests based on comparative coefficient 75:25.

Performance coefficient by category: 5%

Calculation:

 [100% - U.1.A.04] x 5%

Availability

Definition:

Defined as a (regulated) of intact properties by irregular supplies. This indicator is adjusted to reflect the extent to which those affected by power outages are affected by weighing / coefficient of number of households with a supply of less than 18 hours with the factor of 2.

Performance coefficient by category: 20%

Calculation:

 [100% - 0.5 x U.1.A.08 – U.1.A.10] x 20%

Service scope

Definition:

Percentage of the population in the service area served with drinking water supply

Performance coefficient by category: 20%

Calculation:

 [U.2.A.02] x 20%

Non-revenue water

Definition:

The total volume  of NRW divided by the total volume of water produced   

Performance coefficient by category: 20%

Calculation:

If NRW (%) ≤25%=20%

Or NRW(%) ≥  60% = 0%

Others

[60%- NRW %]/35% ] x 20%

Cost efficiency

Definition:

Cost per unit of water sold compared to unit cost estimates during tariff review (U_WT) (excluding return on capital).The unit cost less equal to 90% U_wT­ will receive 100% and the unit cost equal to exceeding 140% of U_WT­ will receive 0%.unit costs 90%  and 140% of U_WT­  are calculated proportionally.

Performance coefficient by category: 10%

Calculation:

 If W.3.B.03 ≥ 140% x U_wT = 0%

or

 If W.3.B.03 ≤ 90% x U_wT  = 100% x 10% = 10%

Others

[[140% - (W.3.B.03/U_WT] / 50%] x 10%

Measurement of the performance of wastewater services

The quality if discharged wastewater

Definition:

Since no effluent quality monitoring is undertaken, a substitution indicator will be applied based on the percentage of the population served by wastewater treatment facilities (including well functioning septic tanks in rural and semi-rural areas).

Performance coefficient by category: 20%

Calculation:

[S.2.A.04] x 20%

Reliability

Definition:

The annual number of overcrowding incidents per 100 km of pipes compared to the ideal level of 0 to a maximum of 100

Performance coefficient by category: 20%

Calculation:

If S.1.B.02 ≥ 100   = 0%

Others

[100 - S.1.B.02 ] x 20%

Service scope

Definition:

Percentage of the population in the service area served with a sewage system (including those using septic tanks in rural and semi-rural areas).

Performance coefficient by category: 50%

Calculation:

[S.2.A.02] x 50%

Cost efficiency

Definition:

Defined as unit cost for wastewater services for serviced households compared to unit cost estimated in tariff revision (U_ST) (excluding return on capital). Costs per unit of less than or equal to 90% of U_ST will receive 100% and the unit cost per unit exceeding 140% of U_ST­ will receive 0%. Unit costs between 90% and 140% of UST are calculated proportionally

Performance coefficient by category: 10%

Calculation:

 If W.3.B.03 ≥ 140% x U_ST = 0%

or

 If W.3.B.03 ≤ 90% x U_ST  = 100% x 10% = 10%

Others

[[140% - ( W.3.B.03/U_ST] / 50%] x 10%

Common services and Measurement of Commercial Performance

Water supply

Definition:

Performance scoring for water services multiplied by the overall performance coefficient

Performance coefficient by category: 45%

Calculation:

[Water performance scoring] x 45%

Wastewater service

Definition:

Water performance scoring multiplied by the overall performance coefficient

Performance scoring for wastewater services multiplied by the overall performance coefficient    

Performance coefficient by category: 35%

Calculation:

[Wastewater performance scoring] x 35%

 Regulatory Reporting

 Regulatory Reporting

 Definition

The reliability of the data determined by the audit process

Calculation [determining the reliability of the data] x 5%

Financial / commercial

Profitability

Definition:

Return on capital as defined in the regulatory accounts divided by the return on equity given in the tariff revision (ROC_T)

Performance coefficient by category: 5%

Calculation:

If F.2.B.02 ≤ 0% = 0%

or

 If  F.2.B.02 ≥  ROC_T = 5%

Others

[F.2.B.02 / ROC_T ] x 5%

 Commercial Efficiency

Definition:

Revenue collection efficiency by metered measurement divided by the total collection rate of 60% that is equal to zero to maximum of 100% which is the ideal performance.

Performance coefficient by category: 10%

Calculation:

 If F.1.B.06 ≤ 60% = 0%

or

 If F.2.B.02 ≥  100% = 10%

Others

[F.2.B.02 – 60%]/40% ] x 10%