WSUD Maintenance: a European Perspective
Perspective Lyon, France European Nina Cossais, PhD student
WSUD Maintenance: a Maintenance: WSUD 1 22 March 2017 – Stormwater Victoria WSUD Seminar Location of Lyon, France
Lyon
Perspective European
Source: Melbourne Museum
WSUD Maintenance: a Maintenance: WSUD 2 22 March 2017 – Stormwater Victoria WSUD Seminar PhD context
Prof. Anne Honegger Prof. Denis Martouzet Two labs:
University of Tours Perspective
European One “local government”:
Three years financial support: (March 2015 – March 2018)
WSUD Maintenance: a Maintenance: WSUD 3 22 March 2017 – Stormwater Victoria WSUD Seminar The metropolis of Lyon, France
INHABITANTS living in 59 municipalities SEWER combined sewer stormwater
WASTEWATER
Perspective TREATEMENT PLANTS European
DETENTION or INFILTRATION STORMWATER BASINS
SOAKAWAYS
WSUD Maintenance: a Maintenance: WSUD 4 22 March 2017 – Stormwater Victoria WSUD Seminar A ”multi-layers” administration France
« Auvergne-Rhône Alpes » Region
Department of Rhône 2015 Amalgamation 1969 - Urban Community of Lyon
City of Lyon = municipality
Perspective European
The “one thousand layers administrative cake” Source : www.femmeactuelle.fr
WSUD Maintenance: a Maintenance: WSUD 5 22 March 2017 – Stormwater Victoria WSUD Seminar A ”multi-layers” administration France
« Auvergne-Rhône Alpes » Region
Department of Rhône 2015 Amalgamation Metropolis of Lyon
City of Lyon = municipality
Perspective European
The “one thousand layers administrative cake” Source : www.femmeactuelle.fr
WSUD Maintenance: a Maintenance: WSUD 6 22 March 2017 – Stormwater Victoria WSUD Seminar Context • Sewer system – Combined sewer (85%) – Partially saturated – 21 July 2015 decree: limits the combined sewer Max 20 d/yr or 5% collected water
overflowing
Perspective European
Infiltration basin in Décines, March 2016 Swale, Garibaldi Street in Lyon, June 2016 WSUD Maintenance: a Maintenance: WSUD 7 22 March 2017 – Stormwater Victoria WSUD Seminar Problem
• Since 1990, WSUD to: – limit overflowing – recharge water tables – cool the city
Perspective – improve living conditions Yet, reluctance to WSUD’s adoption persists European Rank barriers: operation and maintenance
WSUD Maintenance: a Maintenance: WSUD 8 22 March 2017 – Stormwater Victoria WSUD Seminar Questions
• How are stormwater assets maintained? • By who? • What are the main difficulties?
• What should we do about it?
Perspective European
WSUD Maintenance: a Maintenance: WSUD 9 22 March 2017 – Stormwater Victoria WSUD Seminar
”Pervious City” field workshops
Perspective European
Localization of visited sites and facilities in Lyon metropolis area. Production : N.Cossais. Design : SAFEGE Suez Consulting. Source : Lyon metropolis
Field workshops in March 2015 and June 2016
WSUD Maintenance: a Maintenance: WSUD 10 22 March 2017 – Stormwater Victoria WSUD Seminar
Field workshops: first findings
Perspective European
Stormwater detention ponds - Portes des Alpes - Saint-Priest, Lyon, France
WSUD Maintenance: a Maintenance: WSUD 11 22 March 2017 – Stormwater Victoria WSUD Seminar
Perspective European
Lights in a trench
WSUD Maintenance: a Maintenance: WSUD 12 Porte des Alpes, Lyon,22 MarchFrance, 2017 March – Stormwater 2015 Victoria WSUD Seminar Field workshops: first findings
• Main results –Most important barriers to WSUD’s adoption: • Demarcation issues: tasks, costs and responsibilities • Technical aspects (pollution, trash, mosquitoes,
sustainability, esthetics) Perspective –Sewer workers are unhappy with the evolution of
European their profession
“On-the-job” immersions with maintenance teams and roads designers
WSUD Maintenance: a Maintenance: WSUD 13 22 March 2017 – Stormwater Victoria WSUD Seminar Field workshops: first findings
• Main results –Most important barriers to WSUD’s adoption: • Demarcation issues: tasks, costs and responsibilities • Technical aspects (pollution, trash, mosquitoes,
sustainability, esthetics) Perspective –Sewer workers are unhappy with the evolution of
European their profession
“On-the-job” immersions with maintenance teams and roads designers
WSUD Maintenance: a Maintenance: WSUD 14 22 March 2017 – Stormwater Victoria WSUD Seminar Anthropological approach
– Inductive procedure – Participant observation
– Learn about Perspective what is “not
said” European
WSUD Maintenance: a Maintenance: WSUD 15 22 March 2017 – Stormwater Victoria WSUD Seminar Anthropological approach First findings • General context – Increase in the number and the complexity of stormwater facilities – Stagnating or decreasing budgets
Perspective – Demarcation issues
• Source control measures European – Still seen as “new” (swales) – Mixed perception (sand covers, swales) – Little consideration of water needs and opportunities when planning green spaces
WSUD Maintenance: a Maintenance: WSUD 16 22 March 2017 – Stormwater Victoria WSUD Seminar Demarcation issues
Perspective GL
GL GL
European GL
Roadside in Bron (Lyon, France), April 2015 Key: maintenance and/or control Green spaces department (municipality) Roads direction – Trees and Landscape department Metropolis of Lyon Cleaning department Roads department (« Great Lyon »)
WSUD Maintenance: a Maintenance: WSUD 17 Sanitation department 22 March 2017 – Stormwater Victoria WSUD Seminar Demarcation issues • WSUD maintenance complexity –List of tasks for each type of WSUD –Nature of tasks: specialty or not –Department in charge –S=Sanitation Dptmt, G=Green Spaces Dptmt
Perspective S G European
Cleaning of a screen inside the sewer, March 2016 Mowing in Confluence, Lyon, France, May 2016 WSUD Maintenance: a Maintenance: WSUD 18 22 March 2017 – Stormwater Victoria WSUD Seminar Cleaning Sanitation Department Green Spaces Service Roads Direction Department Soakaways C1 - - Surface and storm drains Soakage trench cleaning - - (when needed) C1 S1 C2 Hydraulic structures maintenance - Trash collection (when needed) grassy (depending on dirt and requirement) G1 + Mowing (1 to 4 times/yr) Swales S2 C2 / G1 E2 Hydraulic structures cleaning or G2 vegetated flushing Pruning C1 (when needed) (about 1 to 2 times/yr) (herbs, shrubs, trees) C2 G3
Perspective Weeding (when needed) G4 Watering Buried basins C1 S1 - -
European S1/S2/C2/J2 1st adv. for centralized systems : V1 simple O&M enclosed - Fences and signs maintenance - - Open- (MicroMégas) air S3 basins Self-monitoring open to the C1 C1/C2 S1/S2/S3 - public C2 G1/G2/G3/G4 C1 / G3 R1 Pervious pavement R2 - - Pavement repair Pavement maintenance R2/S2
WSUD Maintenance: a Maintenance: WSUD 19 22 March 2017 – Stormwater Victoria WSUD Seminar Cleaning Sanitation Department Green Spaces Service Roads Direction Department Soakaways C1 - - Surface and storm drains Soakage trench cleaning - - (when needed) C1 S1 C2 Hydraulic structures maintenance - Trash collection (when needed) grassy (depending on dirt and requirement) G1 + Mowing (1 to 4 times/yr) Swales S2 C2 / G1 E2 Hydraulic structures cleaning or G2 vegetated flushing Pruning C1 (when needed) (about 1 to 2 times/yr) (herbs, shrubs, trees) C2 G3
Perspective Weeding (when needed) G4 Watering Buried basins C1 S1 - -
European S1/S2/C2/J2 « Picking up waste, I am V1 enclosed - telling you this- honestly, I - Open- Fences and signs maintenance air S3 don’t want to do it » basins Self-monitoring open to the C1 C1/C2 S1/S2/S3 - public C2 G1/G2/G3/G4 C1 / G3 « It was made in1999-2000. R1 Pervious pavement R2 - - Pavement repair Pavement maintenance I think it was only once cleaned up »R2/S2
WSUD Maintenance: a Maintenance: WSUD 20 22 March 2017 – Stormwater Victoria WSUD Seminar What should we do about it?
• On-going work – On-site measures to assess hydraulic and climatic performance – Internal workshops on pollution, climate change and
service levels Perspective – Internal courses on stormwater management
– Costs and benefits assessment European – Populating GIS with location of WSUDs – Asset hand over – WSUD guidelines for urban designers
WSUD Maintenance: a Maintenance: WSUD 21 22 March 2017 – Stormwater Victoria WSUD Seminar What should we do about it?
• Needs –Define a systematic demarcation of tasks • Who pays what and at what scale? • Who is responsible for what? –Work together with green spaces departments Perspective –GIS?
–Asset audit guidelines European • Perspectives – Implementing WSUD asset management – Build an ambitious (but realistic) project to work together with executive managers and local politicians
WSUD Maintenance: a Maintenance: WSUD 22 22 March 2017 – Stormwater Victoria WSUD Seminar WSUD Maintenance: a European Perspective
Lyon, France Perspective
[email protected] European
Photographs and illustrations : N. Cossais
WSUD Maintenance: a Maintenance: WSUD 23 22 March 2017 – Stormwater Victoria WSUD Seminar