Facts and Figures
General
% of Christchurch Population Reticulated
(The remainder in rural areas have septic tanks and other onsite systems or a weekly nightsoil collection) |
99.9% |
| Number of households currently serviced by CWTP: (as at July, 2002) |
|
| Christchurch |
117,676 (approx) |
| Belfast |
1,315 |
Length of time wastewater takes from kitchen sink to CWTP:
(Amount of time varies from an hour to almost a day depending on distance from CWTP) |
Max 24 hours |
| Average life of pipes: |
at least 90 years |
| Sewer System replacement cost: |
$582 million |
| % Wastewater volume domestic |
90% |
| % Wastewater volume Commercial/Industrial |
10% |
Reticulation
| Length of public pipe reticulation system: |
1,562 km |
| Longest single stretch of pipe: |
20 km (From furthest point to Treatment Plant) |
| Smallest diameter pipe used: |
150mm |
| Largest diameter pipe used: |
1.5 m square |
| Number of manholes: |
22,105 |
| Length of main sewers: |
192 km |
| Length of private laterals (under council care) |
1,100 km |
| Number of flushtanks: |
1,600 |
Pumping
| Number of pumping stations: |
84 |
| Number of pumps: |
165 |
| Number of backup generators: |
8 |
| Total pumping capacity: |
8,700 l/s (litre per second) |
| Number of soil filters: |
16 |
| Number of lines leading to Treatment Plant: |
5 |
| Total capacity of delivery to CWTP: |
4,480 l/s (litre per second) |
Treatment Plants
One minor Treatment Plant at Belfast
Major Treatment Plant at Bromley providing:
- screening
- pre-aeration and grit removal
- primary sedimentation, then
|
Liquids to:
- trickling filter
- secondary sedimentation
- oxidation ponds
- Estuary
|
Solids to:
- digesters
- holding tanks
- belt press
- reuse in farm/forest
|
|
