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Flanders efforts to adjust regulatory framework and policy to enable innovative urban water management
Ingeborg Barrez - VMM and CIW
CONTENTS• Findings
• Policy
• Legislation
• Urban development act
• Code of good practices
• Water assessment
• Tools
• Real estate
• Rainwater Blueprint
• Publications
CONTENTS• FINDINGS
• Policy
• Legislation
• Urban development act
• Code of good practices
• Water assessment
• Tools
• Real estate
• Rainwater Blueprint
• Publications
Finding: 4. Forecast climate change
• Current problems will increase
• Climate change
• Returnperiod halves against 2050
FINDINGS: CONCLUSION
Lack of measures has a negative impact on
• Waterquality
• Overflowfrequency
• Lack of inflitration
CONTENTS• Findings
• POLICY
• Legislation
• Urban development act
• Code of good practices
• Water assessment
• Tools
• Real estate
• Rainwater Blueprint
• Publications
Policy
• European Legislation• European Water Framework Directive
• good general status of the surface water and ground water
• Floods Directive• reduce and manage the risks of floods
Policy
Flemish government 2009-2014
• Adjust the urban development act and code of good
practices
• Reduce and manage the risks of floods
• Measures on the source
POLICY• Policy document 2014-2019 – Minister Schauvliege
• Avoid additional pavement
• Avoid sealing of the soil
• Water Policy document (WFD)
• Apply the strategy ‘retain – store – drain away’ on the field
• (re) use, infiltration and storage of rainwater are our guarantee of
source directed measure
• Ensure room for water
CONTENTS• Findings
• Policy
• LEGISLATION
• Urban development act
• Code of good practices
• Water assessment
• Tools
• Real estate
• Rainwater Blueprint
• Publications
Legislation: Urban development act
• Coverd constructions and paving with permission or duty
to report
• Exemptions
• Infiltration on private domain (no drains)
• Polluted surfaceswaste water
• Public domain
Legislation: Urban development act
• (Re)Use
• Family homes (single) (up 40m²): min. 5.000 l
• Other constructions (up 100 m²): 50 l/m² - max.
10.000 l
Legislation: Urban development act
• Infiltration
• Always obliged!
• 25 l/m² run-off surface.
• 4 m² per 100 m² run-off surface.
• Exemptions
• Protection area I en II (groundwater)
• Property < 250 m²
• Infiltration impossible (motivation!)
Legislation: Urban development act
• Storage
• Area < 2.500 m²
• Min. 25 l/m² run-off surface
• Area > 2.500 m²
• Min. 25 l/m² run-off surface
• Drainage flow rate max. 20 l/s/ha
Legislation: Urban development act• Allotment
• The same principles as for surfacing infiltration!!
• Take into account a extra area of 80 m² per lot
• Regulations on individual parcels remain in force
Legislation: code of good practices
Step 3 : Store
Step 2 : Infiltration
Area without risk of flooding Area with risk of flooding
Step 1: Avoid run-off
Natural situation Reuse dikes
LEGISLATION: WATER ASSESSMENT • An instrument to assess possible hazardous effects of
permits, plans or programs on the water system
• Obligation to ask advice in advance in certain cases
• Results in a water paragraph in the decision (permits, plans
or programs)
• How? A step-by-step approach
2. Conditions to prevent or minimise
3. Conditions to remediate or compensate
1. Hazardous effect: yes/no?
4. Refuse
LEGISLATION: WATER ASSESSMENT - Tools?
• Guidelines
• Internet tool
www.watertoets.be
• Training for users
CONTENTS• Findings
• Policy
• Legislation
• Urban development act
• Code of good practices
• Water assessment
• TOOLS
• Real estate
• Rainwater Blueprint
• Publications
TOOLS: Real estateObligation to provide information on flood prone areas in
publicity and in private and notarial acts
TOOLS: rainwater blueprint
RAINWATER BLUEPRINTBASIC
• Map
• Big areas
• Defining
• Zones of infiltration
• Rainwater drains
• Bottle necks
• Rough copy
DETAIL
• Street/property level
• Modelling
PLAN OF REALIZATION
• Who
• What
• When