The invention relates to a pondage device (1) including a dam (2) and an improvement (3), arranged downstream from said dam, referred to as a downstream improvement. Said device is characterized in that it includes at least one flexible cylinder (4) positioned between said dam (2) and said improvement (3), and in that said flexible cylinder (4) includes a chamber (41) inside of which water is stored, said chamber being at least partially defined by a deformable membrane (40), said chamber (41) being kept under pressure by pressurization means (5).

The invention relates to a pondage device (1) including a dam (2) and an improvement (3), arranged downstream from said dam, referred to as a downstream improvement. Said device is characterized in that it includes at least one flexible cylinder (4) positioned between said dam (2) and said improvement (3), and in that said flexible cylinder (4) includes a chamber (41) inside of which water is stored, said chamber being at least partially defined by a deformable membrane (40), said chamber (41) being kept under pressure by pressurization means (5).

The invention relates to a pondage device (1) including a dam (2) and an improvement (3), arranged downstream from said dam, referred to as a downstream improvement. Said device is characterised in that it includes at least one flexible cylinder (4) positioned between said dam (2) and said improvement (3), and in that said flexible cylinder (4) includes a chamber (41) inside of which water is stored, said chamber being at least partially defined by a deformable membrane (40), said chamber (41) being kept under pressure by pressurisation means (5).

The invention relates to a pondage device (1) including a dam (2) and an improvement (3), arranged downstream from said dam, referred to as a downstream improvement. Said device is characterised in that it includes at least one flexible cylinder (4) positioned between said dam (2) and said improvement (3), and in that said flexible cylinder (4) includes a chamber (41) inside of which water is stored, said chamber being at least partially defined by a deformable membrane (40), said chamber (41) being kept under pressure by pressurisation means (5).

Various embodiments of a modular catch basin for implementation in a high performance bioswale are disclosed. The modular catch basin containing bio-media in bio-media filters to treat urban run-off. Method of installing and maintaining the modular catch basin are also disclosed.