General National Id Netherlands_03 Site name Leidsche Rijn, Utrecht Summary This scheme is currently under development as part of a large residential scheme at Leidsche Rijn, near Utrecht in the Netherlands. The scheme is ambitious in terms of its water management and extensive use of SuDS. It aims to prevent discharges from the site as far as possible (through storage and infiltration) as well as to reduce inputs of poor-quality water from elsewhere. Management of existing and new water bodies on the site will be integral to the scheme, providing improved ecology and recreational opportunities. The time scale for development was expected to be 15-20 years, but due to the economic crisis the overall timescale has increased. A vertical reedbed test site has already been implemented within the site, which some data are available for, although that forms only part of the overall scheme. Light or indepth? Light Location description The site, Leidsche Rijn, is located on the outskirts of Utrecht, in the Netherlands. NUTS Code Utrecht RBD code NLRN Transboundary 0 Data provider Heather Williams and Dilian Jansen, AMEC Source(s) Nieuwe stad, schoon water Voorbereiding praktijkonderzoek verticaal doorstroomd hylofytenfilter NWRM(s) implemented in the case study Permeable surfaces Swales Filter Strips Soakaways Detention Basins Retention Ponds Infiltration basins Longitude 5.0522518 Latitude 52.0964879 Site information Climate zone cool temperate moist Mean rainfall 850 Mean rainfall unit mm/year Average temperature 10 Mean runoff 765 Mean runoff unit 450 - 600 mm Average runoff coefficient 0,899999976158142 Type Case Study Info Groundwater level -1,75 Average slope range 1-2% Vegetation class grass turf, dryland grasses Monitoring maintenance Monitoring impacts effects 0 Performance Performance impact estimation method Unknown Design & implementations Application scale Field Scale Performance timescale > 20 years Area (ha) 2400 Size 146 Size unit ha Design capacity description The test reedbed that has already been installed at the site has the capacity to infiltration filter 2,2 million m3/year and 50% removal of suspended solids Basis of design 2-year storm Design contractual arrangement Arrangement type Responsibility Role Comments Name Design consultation activity Activity stage Key issues Name Comments n/a Design land use change Land use change type Design authority Authority type Role Responsibility Name Comments Local water authority Monitoring HDSR Other Other Gemeente Utrecht Communal authority responsible for collection of storm water and other urban water in Vleuten-De Meern district Other Financing Gemeente Vleuten-De Meern Communal authority responsible for collection of storm water and other urban water in Vleuten-De Meern district Other Other Provincie Utrecht Regional authority (Province) responsible for natura 2000 and spatial planning Lessons, risks, implications... Key lessons Integration of NWRM in a developing area is only possible in coordination with many parties, in particular to achieve the ambitious goal of an independently operating (self-sustaining) water system. The water system was designed as an integral part of the overall masterplan, and was considered from a very early stage in development. Success factor(s) Success factor type Success factor role Comments Attitude of relevant stakeholders main factor Financing Financing type Comments Local funds budget of local authorities EU-funds: LIFE+ pilot study in 2009 through LIFE Barrier Barrier type Barrier role Comments Lacking coordination between authorities secondary barrier A lot of authorities are involved, over a long time period Lacking financing sources secondary barrier Delays to implementation of the entire residential development have occurred as a result of the economic climate Driver Driver type Driver role Comments Balancing different objectives main driver Development of a sustainable water system with recreation and ecological goals Financing share Financing share type Share Comments Policy, general governance and design targets Policy description By keeping storm water in the Lijdsche Rijn area (through storage and infiltration), the communal waste water sytem and treatmentplant will be relieved. Emissions to surface water will be reduced Quantified objectives Less than 0,15 mg/l P (phosphate) in watersystem Part of wider plan 1 Policy target Target purpose Groundwater Recharge Runoff control Peak-flow reduction Pollutants Removal Policy pressure Pressure directive Relevant pressure Policy area Policy area type Policy area focus Name Comments Policy impact Impact directive Relevant impact Policy wider plan Wider plan type Wider plan focus Name Comments Masterplan Leidsche Rijn Policy requirement directive Requirement directive Specification Socio-economic Direct benefits information Reduced requirements for sewer system and waste water treatment capacity Ancillary benefits information Potential for recreational activities in the water courses that will be created (e.g. canoeing and ice skating) Costs investment information Costs of the water management aspects of the project not quantified (incorporated with overall development) Costs operation maintenance Costs of the water management aspects of the project not quantified (incorporated with overall development) Costs total information Costs of the water management aspects of the project not quantified (incorporated with overall development) Ecosystem improved biodiversity 1 Information on Ecosystem improved biodiversity Biodiversity will be improved through improved water quality in surface water courses. In the scheme as a whole, many new water features, including channels and lakes, will be created to provide maximum biodiversity opportinites, taking account of the requirements of target species. Ecosystem provisioning services 0 Information on Ecosystem provisioning services N/A info Ecosystem water supply 1 Information on Ecosystem water supply Increased infiltration to groundwater Ecosystem impact climate regulation Reduced energy use (farm operations) Information on Ecosystem impact climate regulation In overall scheme, there will be a probable reduction in pumping requirements compared to the existing agricultural water management system. Biophysical impacts Retained water 2200000 Retained water unit m3/year Increased water storage 1000 Increased water storage unit m3/ha Water quality overall improvements Positive impact-WQ improvement Information on Water quality overall improvements A test vertical infiltration reedbed was installed at the site, with larger reedbeds now being installed as part of the main development. Improvements to water quality were seen from the test reedbed. Water quality Improvements Phosphorus (P) 80 Water quality Improvements (P) unit % reduction pf pollutant Information on Water quality Improvements (P) 80% reduction in P seen from the test reedbed Water quality Improvements Total Suspended Solid (TSS) 50 Water quality Improvements (TSS) unit % reduction pf pollutant Water quality Improvements (TSS) 50% reduction in TSS seen from the test reedbed. Soil quality overall soil improvements N/A info Information on Soil quality overall soil improvements N/A info Full Context Pathway(aka Context) Default view Area(aka Level or Site) ALL