Experimental green roof observations have shown a positive impact on stormwater at the building s... more Experimental green roof observations have shown a positive impact on stormwater at the building scale: decrease and slow-down of the peak discharge, decrease of runoff volume. This work aims to study how similar effects can be expected at the basin scale and in which proportion they can solve urban management issues. For this purpose a specific methodology has been developed. It combines a conceptual rainfall-runoff model reproducing the hydrological behaviour of green roof with a method defining green roofing scenarios by estimating some realistic roof areas that can be covered. This methodology has been applied to the Châtillon urban basin (Haut-de-Seine county, France) which is frequently affected by urban flooding. Basin response to several rainfall events characterized by very different properties in terms of duration and intensity has been studied. For comparison, the same procedure has been applied at the roof scale and a complementary analysis has been conducted to study whi...
Water science and technology : a journal of the International Association on Water Pollution Research, 2014
This paper is based on a prospective scenario of development of rainwater harvesting (RWH) on a g... more This paper is based on a prospective scenario of development of rainwater harvesting (RWH) on a given large urban area (such as metropolitan area or region). In such a perspective, a new method is proposed to quantify the related potential of potable water savings (PPWS) indicator on this type of area by adapting the reference model usually used on the building level. The method is based on four setting-up principles: gathering (definition of buildings-types and municipalities-types), progressing (use of an intermediate level), increasing (choice of an upper estimation) and prioritizing (ranking the stakes of RWH). Its application to the Paris agglomeration shows that is possible to save up to 11% of the total current potable water through the use of RWH. It also shows that the residential sector offers the most important part because it holds two-thirds of the agglomeration PPWS.
This paper presents a new method for evaluating potential water savings at urban community level ... more This paper presents a new method for evaluating potential water savings at urban community level from replacing drinking water with rainwater harvested from building rooftops. The first section presents a typology of buildings that makes it possible to move from an elementary “building” scale to an urban community scale. This building typology provides us with a series of building types that may be used in rainwater harvesting. The second section provides a numerical evaluation of the potential water savings based on the aforementioned building types by selecting “situation type” uses of rainwater best adapted to each building type. Our findings indicate a 18% drop in water savings vis-à-vis the global method currently used - which considers all rainwater that falls on roofs as usable - and our evaluation method. They also show how we can generate water savings close to those initially estimated - but with gains in terms of resources deployed - by selecting “situation types” of rain...
Experimental green roof observations have shown a positive impact on stormwater at the building s... more Experimental green roof observations have shown a positive impact on stormwater at the building scale: decrease and slow-down of the peak discharge, decrease of runoff volume. This work aims to study how similar effects can be expected at the basin scale and in which proportion they can solve urban management issues. For this purpose a specific methodology has been developed. It combines a conceptual rainfall-runoff model reproducing the hydrological behaviour of green roof with a method defining green roofing scenarios by estimating some realistic roof areas that can be covered. This methodology has been applied to the Châtillon urban basin (Haut-de-Seine county, France) which is frequently affected by urban flooding. Basin response to several rainfall events characterized by very different properties in terms of duration and intensity has been studied. For comparison, the same procedure has been applied at the roof scale and a complementary analysis has been conducted to study whi...
Water science and technology : a journal of the International Association on Water Pollution Research, 2014
This paper is based on a prospective scenario of development of rainwater harvesting (RWH) on a g... more This paper is based on a prospective scenario of development of rainwater harvesting (RWH) on a given large urban area (such as metropolitan area or region). In such a perspective, a new method is proposed to quantify the related potential of potable water savings (PPWS) indicator on this type of area by adapting the reference model usually used on the building level. The method is based on four setting-up principles: gathering (definition of buildings-types and municipalities-types), progressing (use of an intermediate level), increasing (choice of an upper estimation) and prioritizing (ranking the stakes of RWH). Its application to the Paris agglomeration shows that is possible to save up to 11% of the total current potable water through the use of RWH. It also shows that the residential sector offers the most important part because it holds two-thirds of the agglomeration PPWS.
This paper presents a new method for evaluating potential water savings at urban community level ... more This paper presents a new method for evaluating potential water savings at urban community level from replacing drinking water with rainwater harvested from building rooftops. The first section presents a typology of buildings that makes it possible to move from an elementary “building” scale to an urban community scale. This building typology provides us with a series of building types that may be used in rainwater harvesting. The second section provides a numerical evaluation of the potential water savings based on the aforementioned building types by selecting “situation type” uses of rainwater best adapted to each building type. Our findings indicate a 18% drop in water savings vis-à-vis the global method currently used - which considers all rainwater that falls on roofs as usable - and our evaluation method. They also show how we can generate water savings close to those initially estimated - but with gains in terms of resources deployed - by selecting “situation types” of rain...
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