{"id":26686,"date":"2024-10-03T09:42:44","date_gmt":"2024-10-03T07:42:44","guid":{"rendered":"https:\/\/asso.graie.org\/portail\/?p=26686"},"modified":"2025-02-12T11:49:29","modified_gmt":"2025-02-12T10:49:29","slug":"illustration-de-leau-verticale","status":"publish","type":"post","link":"https:\/\/asso.graie.org\/portail\/illustration-de-leau-verticale\/","title":{"rendered":"Le cheminement vertical de l’eau"},"content":{"rendered":"\n
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Illustration par Nicolas Journoud, pour le Graie, 2024<\/strong><\/h2>\n\n\n\n
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Se rapprocher au mieux du cycle naturel de l’eau<\/strong><\/h2>\n\n\n\n
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@Graie<\/figcaption><\/figure>\n\n\n\n
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T\u00e9l\u00e9charger l’illustration<\/strong><\/a><\/div>\n<\/div>\n\n\n\n
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Le cheminement a\u00e9rien<\/strong><\/h2>\n\n\n\n
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1<\/h2>\n\n\n\n

G\u00e9rer l’eau de pluie au plus pr\u00e8s o\u00f9 elle touche le sol<\/h3>\n<\/div>\n\n\n\n
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Lors d\u2019\u00e9v\u00e9nements pluvieux, l’eau qui tombe sur la ville se charge en polluants tout au long de son parcours : elle capte de la pollution atmosph\u00e9rique, puis entraine des substances et mati\u00e8res lors du lessivage et de l’\u00e9rosion des surfaces (toitures, fa\u00e7ades, chauss\u00e9es et sols).
L’eau de pluie devient eau de ruissellement.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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La surface : la ville perm\u00e9able, la ville poreuse<\/strong><\/h2>\n\n\n\n
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2<\/h3>\n\n\n\n

Limiter et ralentir le ruissellement,
> stocker temporairement,
> favoriser la d\u00e9cantation, la filtration et l\u2019infiltration dans les sols. <\/h3>\n<\/div>\n\n\n\n
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L’eau de pluie a une destination diff\u00e9rente selon les surfaces qu’elle rencontre.
Les surfaces v\u00e9g\u00e9talis\u00e9es pr\u00e9sentent des avantages suppl\u00e9mentaires en mati\u00e8re de gestion des eaux pluviales : elles favorisent l’\u00e9vaporation et l’\u00e9vapotranspiration, et mettent l’eau de pluie au service du v\u00e9g\u00e9tal avant infiltration.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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Le cheminement sous-terrain<\/strong><\/h2>\n\n\n\n

Selon les surfaces, les am\u00e9nagements et les ouvrages qu’elle rencontre,
Cas n\u00b01 – le syst\u00e8me unitaire <\/mark><\/strong>– l’eau de pluie va rejoindre un r\u00e9seau unitaire, dans lequel les eaux de ruissellement sont m\u00e9lang\u00e9es \u00e0 des eaux us\u00e9es.
Si une partie passera par la station d’\u00e9puration, le trop plein d’eaux pluviales entrainera des eaux us\u00e9es vers les d\u00e9versoirs d’orage, provoquant des rejets de m\u00e9langes d’eaux us\u00e9es et d’eaux pluviales directement dans les eaux superficielles (majoritairement les cours d’eau), sans traitement.
Cas n\u00b0 2 – le syst\u00e8me s\u00e9paratif<\/mark><\/strong> – Sous r\u00e9serve des bons branchements, l’eau de pluie est collect\u00e9e s\u00e9par\u00e9ment dans un collecteur d’eau pluviale ; ainsi, la station d’\u00e9puration est pr\u00e9serv\u00e9e et r\u00e9serv\u00e9e au traitement des eaux us\u00e9es. Mais les collecteurs pluviaux concentrent les flux d’eaux pluviales et de toutes les substances qu’elles entrainent, acc\u00e9l\u00e8rent leur \u00e9vacuation vers les milieux r\u00e9cepteurs et les rejettent de mani\u00e8re concentr\u00e9e et centralis\u00e9e dans les milieux r\u00e9cepteurs
Dans ces deux premiers cas, il s’agit d’\u00e9vacuer les eaux pluviales le plus vite et le plus \u00e0 l’aval possible.<\/p>\n\n\n\n

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3<\/h3>\n\n\n\n

Consid\u00e9rer l\u2019eau de pluie comme une ressource<\/h3>\n<\/div>\n\n\n\n
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Cas n\u00b03 – La gestion \u00e0 la source
<\/strong><\/mark>les eaux pluviales s\u2019infiltrent dans le sol et suivent deux trajectoires :
Les eaux vertes resteront pi\u00e9g\u00e9es dans le sol, \u00e0 disposition du v\u00e9g\u00e9tal ; elles s’\u00e9vaporent lentement ou par \u00e9vapotranspiration apr\u00e8s absorption par la v\u00e9g\u00e9tation.
Les eaux bleues alimenteront les nappes phr\u00e9atiques, apr\u00e8s filtration dans le sol et le sous-sol<\/p>\n<\/div>\n<\/div>\n\n\n\n

<\/div>\n\n\n\n

La gestion int\u00e9gr\u00e9e des eaux pluviales<\/mark> permet une meilleure redistribution de l\u2019eau, le respect du cycle de l\u2019eau, le rafraichissement des villes, la pr\u00e9servation et l’alimentation des milieux aquatiques et la limitation des inondations.<\/strong><\/h3>\n\n\n\n
<\/div>\n\n\n\n

Cette illustration a \u00e9t\u00e9 r\u00e9alis\u00e9e par Nicolas Journoux \u00e0 la demande du Graie.<\/em><\/p>\n\n\n\n

Cette illustration est libre de droits : elle est destin\u00e9e \u00e0 \u00eatre utilis\u00e9e et diffus\u00e9e largement.<\/em><\/p>\n\n\n\n

Sa diffusion et son utilisation ne n\u00e9cessitent pas une autorisation de la part du Graie.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

Illustration par Nicolas Journoud, pour le Graie, 2024 Se rapprocher au mieux du cycle naturel de l’eau @Graie T\u00e9l\u00e9charger l’illustration Le cheminement a\u00e9rien 1 G\u00e9rer l’eau de pluie au plus pr\u00e8s o\u00f9 elle touche le sol Lors d\u2019\u00e9v\u00e9nements pluvieux, l’eau …<\/p>\n","protected":false},"author":16,"featured_media":27535,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"footnotes":""},"categories":[32,1505,29],"tags":[],"acf":[],"yoast_head":"\nLe cheminement vertical de l'eau | Graie<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/asso.graie.org\/portail\/illustration-de-leau-verticale\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Le cheminement vertical de l'eau | Graie\" \/>\n<meta property=\"og:description\" content=\"Illustration par Nicolas Journoud, pour le Graie, 2024 Se rapprocher au mieux du cycle naturel de l’eau @Graie T\u00e9l\u00e9charger l’illustration Le cheminement a\u00e9rien 1 G\u00e9rer l’eau de pluie au plus pr\u00e8s o\u00f9 elle touche le sol Lors d\u2019\u00e9v\u00e9nements pluvieux, l’eau …\" \/>\n<meta property=\"og:url\" content=\"https:\/\/asso.graie.org\/portail\/illustration-de-leau-verticale\/\" \/>\n<meta property=\"og:site_name\" content=\"Graie\" \/>\n<meta property=\"article:published_time\" content=\"2024-10-03T07:42:44+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-02-12T10:49:29+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/asso.graie.org\/portail\/wp-content\/uploads\/2025\/02\/Mise-en-avant-site.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"600\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Maureen Carpentier\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@asso_graie\" \/>\n<meta name=\"twitter:site\" content=\"@asso_graie\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Maureen Carpentier\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/asso.graie.org\/portail\/illustration-de-leau-verticale\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/asso.graie.org\/portail\/illustration-de-leau-verticale\/\"},\"author\":{\"name\":\"Maureen Carpentier\",\"@id\":\"https:\/\/asso.graie.org\/portail\/#\/schema\/person\/486e14d091ff09d12f2b31bad560eb4f\"},\"headline\":\"Le cheminement vertical de l’eau\",\"datePublished\":\"2024-10-03T07:42:44+00:00\",\"dateModified\":\"2025-02-12T10:49:29+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/asso.graie.org\/portail\/illustration-de-leau-verticale\/\"},\"wordCount\":548,\"publisher\":{\"@id\":\"https:\/\/asso.graie.org\/portail\/#organization\"},\"articleSection\":[\"Eaux pluviales et am\u00e9nagement\",\"Mettre en avant - 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