Martin Jørgen Andersen, Project Manager in Nordvand Stormwater discharge to Øresund

I lange præsentationer kan det være en fordel at inddele i kapitler. Det skaber struktur og gør det lettere for tilhørerne at følge med – eller hoppe på igen. Du kan finde flere kapitelforsider i nederst i denne præsentation Why?

Huge level of flooding Flood after rainstorm

Status - dammings from existing combined sewer system

Bathing water quality can be improved

I lange præsentationer kan det være en fordel at inddele i kapitler. Det skaber struktur og gør det lettere for tilhørerne at følge med – eller hoppe på igen. Du kan finde flere kapitelforsider i nederst i denne præsentation How?

Indsæt billede af området der skal separeres med farver og tunnelledning fra kommunikationsgrundlaget. Construction project in 5 stages

Outlet structure

I lange præsentationer kan det være en fordel at inddele i kapitler. Det skaber struktur og gør det lettere for tilhørerne at følge med – eller hoppe på igen. Du kan finde flere kapitelforsider i nederst i denne præsentation Challenges with the discharge of stormwater?

Discharge permission Demands:  Discharge having first flush of 100 l/s to the combined sewer system  Initial dilute of at least 1:5  No environment-enhancing substances that can harm the aquatic environment  No outlet that can harm the bathing water quality at the nearby beaches. Nordvand can be imposed to examine any changes  Grit champer on all stormwater gutter wells

Discharge permission Demands:  Discharge having first flush of 100 l/s to the combined sewer system  Initial dilute of at least 1:5  No environment-enhancing substances that can harm the aquatic environment  No outlet that can harm the bathing water quality at the nearby beaches. Nordvand can be imposed to examine any changes  Grit champer on all stormwater gutter wells  Discharge outlet point should be 250 meters from the coast with a outlet under the surface.

Diffusion calculation

The assumptions for the calculation -In the stormwater the concentration is set to cfu/100ml for E.Coli and 8000 cfu/100ml for enterococci’s (The National Agency of environmental Protection) -Requirements for excellent bathing water quality at 250cfu/100ml for E. Coli and 100cfu/100ml for enterococci’s must be applied with 100 meters from the coast -Weather situation corresponding to a summer dag without any wind and no currant

Reflections and unanswered questions -Missing clear official standards in terms of enironmental affect -Very expensive ”swimming ticket” -Where should the bar be placed in terms of enteroccoci and E.Coli -How does the wind and currant affect the delute of the stormwater -When is first flush needed -How long time should first flush be used (when is the first water which is most polluted gone from a stormwater system)

Thanks for your time