La gestion intégrée des eaux pluviales - AQUA-ADD Interreg IVC ...
La gestion intégrée des eaux pluviales - AQUA-ADD Interreg IVC ... La gestion intégrée des eaux pluviales - AQUA-ADD Interreg IVC ...
2 FOR A GLOBAL APPROACH TO WATER IN THE CITY Gerland Park Lyon In turn a resource, commodity, heritage, waste, lever for development and support for cooperation - water is clearly multi-faceted. Its multiple uses and the various constraints associated with its management lie at the heart of the preoccupations of local authorities. Over the past decade, developments linked to climate change, increasing urbanisation and pollution, and more generally the imperatives of sustainable development, have made water a major challenge in our society today. A challenge which now forces us to rethink our management of the urban water cycle and to switch from a sector-based vision to a comprehensive and integrated approach to water in all its aspects. A coherent policy This is why Grand Lyon has defined a Sustainable Water Policy, favouring environmental conservation, improvement in the environment in which we live and economic development. The Water Department is thus seeking out innovative solutions in all its areas of responsibility, in the field of alternative technologies and integrated management. Acting together and sustainably The objectives of urban densification and the climate changes in the future force us today to undertake a total rethink of the place of water in the city. The infrastructures for rainwater management in the city must not only be functional and effective to meet the city’s needs. They now directly help to build a new natural landscape heritage in the city - a venue for social and leisure activities. Their design and their management must thus be shared by all those involved in the development and maintenance of the territories to ensure this multi-functionality. The successful example of the development of the Porte des Alpes encourages us to reinforce our approach of technical consultation in all our projects so as to integrate a holistic vision of the water cycle in the city. copyright © Jacques Leone, Grand Lyon © Unité communication de la Direction de l’eau, Grand Lyon © Ilex-paysages © Laurence Danière © Asylum/ Alain Marguerit - Ateliers paysages © Klimakvarter.dk, Ville de Copenhague Lyon Urban Community Water Department 117, boulevard Marius Vivier Merle 69003 Lyon - France + 33 (0)4 78 63 40 40 www.grandlyon.com
3 Urban rainwater A resource to be used Place doctors Mérieux Lyon Regarded as a random phenomenon and a constraint to be managed, urban rainwater has historically been managed separately from other elements in the urban water cycle. This approach is today reaching its limits and, in parallel, we have become aware of the rich resource which rainwater could represent. Refreshment for the city, irrigation of planted landscaped spaces, climatisation of buildings with green roofs ... It can be used in many ways, but new approaches are called for. Moving beyond exclusively technical responses With the urban development of the past few decades, the soil of the agglomeration has become increasingly less permeable, and now no longer allows sufficient percolation of rainwater into the water table. The challenge facing us today and tomorrow consists of favouring the re-infiltration of this water into the subsoil, limiting the flood risk, and supplying and conserving the agglomeration’s water resources. Adapting to the territory To be effective, these systems need to take account of the reality in the territories. The topography, hydrology and geology can help us to find innovative solutions. Thus, Grand Lyon has 3 sectors. The dense urban centre has a highly developed combined sewer network which can be optimised. In West Lyon, with its poorly infiltrating rocky land, a separate network needs to be developed with rainwater being discharged into its streams. Lying on permeable land without a hydrographical network, East Lyon allows rainwater to percolate into the land. The “Development and Rainwater” guides and the reference work for the design and management of public spaces Grand Lyon has developed tools to help planners integrate rainwater management from the design stage of a project. The “Development and Rainwater” guides explain the management rules and the procedures to be followed. The reference work on the “Design and Management of Public Spaces” specifies the highway design rules, and the types of materials for public spaces or other developments. In producing these tools, Grand Lyon wished to encourage the various trades to work in complete synergy, in order to move towards an integrated rainwater management. The guides and the reference work can be found on Grand Lyon’s website: grandlyon.com A votre service > Eau et assainissement > Gestion des eaux pluviales Working on the transversality of services In every development project undertaken in its territory, Grand Lyon’s Water Department works in close collaboration with Grand Lyon’s Highways, Urban Design and Sanitation Departments, and likewise all the other parties involved in the development. By jointly considering the issues of water, air, noise, climate, well-being and economic development, they put in place sustainable solutions, arising from the synergy of all their skills.
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2<br />
FOR A GLOBAL APPROACH<br />
TO WATER<br />
IN THE CITY<br />
Gerland Park<br />
Lyon<br />
In turn a resource, commodity, heritage, waste, lever<br />
for development and support for cooperation - water<br />
is clearly multi-faceted. Its multiple uses and the various<br />
constraints associated with its management lie at the heart<br />
of the preoccupations of local authorities. Over the past<br />
decade, developments linked to climate change, increasing<br />
urbanisation and pollution, and more generally the imperatives<br />
of sustainable development, have made water a major<br />
challenge in our society today. A challenge which now forces<br />
us to rethink our management of the urban water cycle<br />
and to switch from a sector-based vision to a comprehensive<br />
and integrated approach to water in all its aspects.<br />
A coherent policy<br />
This is why Grand Lyon has defined a Sustainable Water Policy,<br />
favouring environmental conservation, improvement in<br />
the environment in which we live and economic development.<br />
The Water Department is thus seeking out innovative<br />
solutions in all its areas of responsibility, in the field<br />
of alternative technologies and integrated management.<br />
Acting together and sustainably<br />
The objectives of urban densification and the climate changes<br />
in the future force us today to undertake a total rethink<br />
of the place of water in the city.<br />
The infrastructures for rainwater management in the city must<br />
not only be functional and effective to meet the city’s needs.<br />
They now directly help to build a new natural landscape<br />
heritage in the city - a venue for social and leisure activities.<br />
Their <strong>des</strong>ign and their management must thus be shared<br />
by all those involved in the development and maintenance<br />
of the territories to ensure this multi-functionality.<br />
The successful example of the development of the Porte<br />
<strong>des</strong> Alpes encourages us to reinforce our approach of technical<br />
consultation in all our projects so as to integrate a holistic<br />
vision of the water cycle in the city.<br />
copyright<br />
© Jacques Leone, Grand Lyon<br />
© Unité communication de la<br />
Direction de l’eau, Grand Lyon<br />
© Ilex-paysages<br />
© <strong>La</strong>urence Danière<br />
© Asylum/ Alain Marguerit -<br />
Ateliers paysages<br />
© Klimakvarter.dk,<br />
Ville de Copenhague<br />
Lyon Urban Community<br />
Water Department<br />
117, boulevard<br />
Marius Vivier Merle<br />
69003 Lyon - France<br />
+ 33 (0)4 78 63 40 40<br />
www.grandlyon.com
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