1. General information
2. Objectives of the intervention
Goals of the intervention
The main goal is to sustainably provide clean surface water and managing water levels (ref. 1). Additional goals are to:
-minimize the environmental strain by preventing influx from polluted water into the system and use of sustainable materials (ref. 5),
-to promote biodiversity by means of providing water with high oxygen, providing habitat for flora and fauna and creating fish passages
-to increase climate change resiliency through the management of water levels (ref. 1, 2) and recreation (taking into account canoeing and ice skating) (ref. 1) while maintaining aesthetic value (ref. 5).
-minimize the environmental strain by preventing influx from polluted water into the system and use of sustainable materials (ref. 5),
-to promote biodiversity by means of providing water with high oxygen, providing habitat for flora and fauna and creating fish passages
-to increase climate change resiliency through the management of water levels (ref. 1, 2) and recreation (taking into account canoeing and ice skating) (ref. 1) while maintaining aesthetic value (ref. 5).
Quantitative targets
A water system with a surface area of 2400 ha [3]
Reduction of 6 million influx water per year [5].
Maximum 20% of storm water in Leidsche Rijn can enter the sewage system [1]
Bioswales have a predicted frequency of overflow of once per 2 years and water can be discharged from the bioswales at a rate of max. 1.5 l/ha if water levels remain high for 2 consecutive days (ref. 3)
Prevention of 20% of surface water plants (ref. 3)
Maximum water level targets, which varies between water courses in the district (ref. 3)
Targets for the reduction of heavy metals such as zinc and copper in the substrate of water bodies (ref. 3)
Targets for transparency of surface water (<1 meter): phosphate max 0.05 mg P/I, oxygen > 6 mg O2/l (ref. 3)
For natural wetlands, to have optimal ecological connecting zones with the Haarrijnse Plas (Ref. 3)
Reduction of 6 million influx water per year [5].
Maximum 20% of storm water in Leidsche Rijn can enter the sewage system [1]
Bioswales have a predicted frequency of overflow of once per 2 years and water can be discharged from the bioswales at a rate of max. 1.5 l/ha if water levels remain high for 2 consecutive days (ref. 3)
Prevention of 20% of surface water plants (ref. 3)
Maximum water level targets, which varies between water courses in the district (ref. 3)
Targets for the reduction of heavy metals such as zinc and copper in the substrate of water bodies (ref. 3)
Targets for transparency of surface water (<1 meter): phosphate max 0.05 mg P/I, oxygen > 6 mg O2/l (ref. 3)
For natural wetlands, to have optimal ecological connecting zones with the Haarrijnse Plas (Ref. 3)
Monitoring indicators defined
Slib levels in water courses in order to determine timing of dredging activities.
The extent of accumulation of pollution on different locations in the system
(ref. 3)
The extent of accumulation of pollution on different locations in the system
(ref. 3)
Sustainability challenge(s) addressed
Climate change adaptation: What were the goals of the NBS?
Climate change adaptation: What activities are implemented to realize the conservation goals and targets?
What types of restoration goals are / were defined for the NBS intervention?
What activities are implemented to realize the restoration goals and targets?
Implementation activities
4 pumping stations that circulate required amount of water in order to ensure water quality [5]
11 main dams and 30 secondary dams [5]
Bioswales in living areas that temporarily capture and filter storm water [1]
3 natural wetlands: Haarrijnse Plas (80ha), Plas Veldhuizen (25 ha) and Vleuterweide (20 ha) (ref. 1)
Permeable pavings in street areas including Terwijde (ref. 1)
Green banks that leads the water which contains vegetation that organically purifies the water (ref. 1)
Fish passages in pumping stations and dams to promote movement of fish from area to area (ref. 1)
11 main dams and 30 secondary dams [5]
Bioswales in living areas that temporarily capture and filter storm water [1]
3 natural wetlands: Haarrijnse Plas (80ha), Plas Veldhuizen (25 ha) and Vleuterweide (20 ha) (ref. 1)
Permeable pavings in street areas including Terwijde (ref. 1)
Green banks that leads the water which contains vegetation that organically purifies the water (ref. 1)
Fish passages in pumping stations and dams to promote movement of fish from area to area (ref. 1)
Type of NBS project
3. NBS domains, ES and scale
4. Governance and financing
5. Innovation
Type of innovation
Please specify technological innovation
The intervention involved the creation of new waterways and bioswales, permeable paving, weirs for water level regulation, pumping systems to ensure water flow, creation of soft and hard (engineered) water banks, syphons and plungers to prevent intermixing of clean and polluted water, bridges, water filtration system and decontaminating water substrates. [1, 3, 5, 10]
Novelty level of the innovation
Please specify novelty level of the innovation
This is the first time this type of water system, with a large variety of different elements (see technological innovation) is built in the Netherlands [3]
Replicability/Transferability
Please specify Replicability/Transferability
Unknown
