National audience | Objectives of the Saint-Brès landfill capping are waterproofing, water drainage and earth retaining. Slopes on cover reach 66% with length superior to 10 m. Geosynthetic solution is composed from bottom to top of a protective geotextile, a drainage geocomposite industrially associated to a textured 8/10 mm polyethylene film to increase the stability of the system and a earth retaining geogrid. Geocomposite has been designed with Lymphéa® software to drain a rain of 266 mm/day. A polyethylene film was welded on site to increase the waterproofing of the capping. | La réalisation de la couverture du centre de stockage de déchets ménages et assimilés (CSDMA) de Saint-Brès a pour objectifs l'imperméabilisation, le drainage des eaux de pluies et la retenue de la terre végétale. La couverture possède des talus pentés à 66 % avec des rampants supérieurs à 10 m. Le complexe géosynthétique est composé de bas en haut par un géotextile antipoinçonnant, un géocomposite de drainage associé en usine à un film polyéthylène 8/10 mm texturée en sous-face pour augmenter la stabilité du dispositif et une géogrille de retenue des terres. Le géocomposite a été dimensionné hydrauliquement avec le logiciel Lymphéa® pour drainer une pluie de 266 mm/jour. Le film du géocomposite a été soudé sur site pour garantir une imperméabilisation optimale de la couverture.

National audience | Given the good performance of geosynthetic material for drainage, it seems interesting to use these products to replace part or all of the drainage layer commonly used in landfill cells (silicate materials). The calculation showed that the replacement of a granular layer of 0.50 m by a drainage geosynthetic product is not always as easy as it seems: the maximum water head legally acceptable decreases with the thickness of the studied equivalent solution, which limits its ability to flow. ARCADIS and SITA DECTRA present here a case study on the Romagne-sous-Montfaucon landfill site for which a hybrid (solid granular + geosynthetic) was called. | Compte tenu des bonnes performances des géosynthétiques de drainage, il semble intéressant d'utiliser ces produits pour remplacer tout ou partie du massif drainant généralement utilisé en fond de casier d'installations de stockage de déchets. Le calcul montre que le remplacement d'une couche granulaire de 0,50 m par un géosynthétique de drainage n'est pas toujours aussi aisé qu'il y paraît : la charge maximale réglementairement acceptable diminue avec l'épaisseur du dispositif équivalent considéré, ce qui limite sa capacité de débit. Arcadis et Sita Dectra présentent ici une étude de cas sur le site de Romagne-sous-Montfaucon pour lequel un dispositif hybride (massif granulaire + géosynthétique) a été préconisé.

National audience | To face the estival tourist multitude in Corsica, it is necessary to store drinking water in great quantity during more than 6 months and this on the level of communes whose financial capacities are reduced. Original and economic techniques presented here were developed by the OEHC. The communication presents the technological developments and the reduction of the costs, thanks to the use of géomembranes and floating covers able to store and protect water during more than 6 months without giving taste to water. The results on the long-term evolution of the floating PVC covers are given. This type of solution returns ten times less expansive than a of the same tank capacity with bottom in géomembrane and concrete cover. | Pour faire face à l'affluence touristique estivale en Corse, il est nécessaire de stocker l'eau potable en grande quantité pendant plus de six mois et ceci au niveau de communes dont les capacités financières sont réduites. Des techniques originales et économiques présentées ici ont été développées par l'Office d'équipement hydraulique de la Corse. L'article présente l'évolution de la technique et la réduction des coûts, grâce à l'emploi de géomembranes et de couvertures flottantes capables de stocker et protéger l'eau pendant plus de six mois sans donner de goût à l'eau. Les résultats sur l'évolution à long terme des couvertures flottantes en PVC sont donnés. Ce type de solution revient dix fois moins chère qu'un réservoir de même capacité avec fond en géomembrane et couverture en béton.

In the context of nonpoint source pollution the regulator can not attribute individually the responsibility of pollution because of informational asymmetry which makes the costs of monitoring of individual emission very high. This grounds a moral hazard problem. We analyse group performance based instruments to regulate this kind of informational problem. In particular, we assess randomand collective fining schemes with respect to their deterrence and efficiency. We show that a collective fine scheme is more deterrent than a random fine scheme. However, the analysis of efficiency is less categorical between these two schemes. The efficiency depends on the number of non-compliant agents. If the number of non-compliant agents is high it is better to implement a collective fine scheme. If the number of non-compliant agents is small it is better to implement a random fine scheme.

In this article we treat the problemof nonpoint source pollution as a problem of moral hazard in group. To solve this kind of problemwe consider a group performance based tax coupled to tradable permits market. The tax is activated if the group fails to meet the ambient standard. So the role of the tax is to provide an incitation to ensure that the agents provide the abatement level necessary to achieve the standard. The role of the tradable permits market is to distribute effectively this abatement level through the price of the permits which rises with the exchange of the permits.

Arsenic is inorganic spread out in nature. Toxicity of arsenic is different, depending on its form. However, current international and Serbian legislation in drinking water regulate maximum allowed concentration of 0.010 mg/l (of total arsenic), regardless of its form. Concentration of total arsenic in water of springs of mountain Avala (Serbia) is higher than 0.010 mg/l. This paper present determination of inorganic arsenic in drinking water of spring Sakinac (Avala), also determination which form is more represented, relation of As(III) and As(V) and implementation of legislation. We used stripping voltametry method and gain value of total arsenic-62.87 microgram/l, in which 3.97 microgram/l is As(III) and residue of 58.90 microgram/l is As(V). It is obvious that value of 62.87 microgram/l is higher than MAL, but the most abundant arsenic form is less toxic, so the question is whether the water from spring Sakinac can or cannot be used.