Facts and figures
Overview of facts and figures from the Noorderzijlvest Water Authority.
Key figures Noorderzijlvest
| Noorderzijlvest working area | Groningen north of the Eemskanaal, northwest Drenthe, and the Frisian part of the Lauwersmeer area |
| Size of our management area | approx. 144,000 ha (= 1,440 km²) |
Number of municipalities in our working area | 9 municipalities:
|
| WFDriver basin | Lower Rhine, North Rhine |
| Natura 2000areas in our management area | Leekstermeer area: Norgerholt Fochteloër Moor |
| Number of inhabitants in our working area | 417,226 (as of December 31, 2024) |
| Number of pollution units (PUs) | 416,000 units declared |
| Noorderzijlvest employees | 316 employees. That's 300 positions. |
| Lowest point in our working area | -3.00 m NAP lowest point in our area |
| Highest point in our working area | +12.10 m NAP highest point in our area |
Surface waters
Key figures Noorderzijlvest
| Our primary waterways | 2,233 km |
| Our water board ditches | 28 km |
| Our locks under the chimney | 1,335 km |
| Our water storage areas (storage in case of disaster) according to the definition under the Environment Act | 1,485 ha |
| Our surface water pumping stations | 150 |
| Mills capable of grinding in our management area | 17 windmills |
| Our water board weirs | 833 weirs |
| Our locks | 17 locks |
| Our inlets | 390 inlets |
| Our fish passages | 29 fish passages |
| The bridges over main waterways in our working area | 1,274 of which:
|
| Our diversin main waterways | 7,451 divers |
Flood defenses(dikes and quays)
Key figures Noorderzijlvest
| Primary flood defenses – Lauwersoog to Delfzijl (the Ommelanderzeedijk) | 69 km |
| Regional and other flood defenses | 486.7 miles |
| Amount of asphalt | 114 ha |
| How much stone rolling | 51.5 ha |
| Number of access and maintenance roads | 30 hectares |
| Amount of turf | 387 ha |
| Quantity of fencing | 40 km |
| Number of cross fences | 138 pieces |
| Number of dike warehouses (workshops) | 6 |
| Number of posts for dike surveillance | 8 |
Water purification
Key figures Noorderzijlvest
| Treated wastewater per year | 63,750,000 m³ (= nearly 64 billion liters) |
| Number of pollution units | 416,000 units declared |
| Our wastewater treatment plants | 13 |
| Our sludge dewatering plant | 1 |
| Number of transport pumping stations | 113 sewage pumping stations under our own management |
| Our press lines | 361 km |
| Sewage overflowsin our area | 453 |
| IBAs inour management area | 1217 |