2016 11 08_ewa_storm_water_overflow_final

12th EWA Brussels Conference“EU Water Policy and

Sustainable Development”

Storm water overfows Challenges

Bruno rakedjian - European CommissionDirectorate General for Environment

Unit C.2 - Marine Environment & Water Industry

Main result of UWWTD

implementaton in 2012

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Storm water sewage overflows

Compliance results at EU-28, EU-15 and EU-13 level regarding Articles 3 (collection), 4 (secondary treatment) and 5 (more

stringent treatment). Average values are reflected, weighted by pollution load generated by individual Member States.

StudyStorm water sewage overflows

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The Outcome of the study

Synthesis

EU legislaton, internatonal conventons (RSCs and river basin commissions)

Member States: regulatons and guidance and US approach

Overview of storm water overfows in the Member States

Literature review on potental health risks

• htps://circabc.europa.eu/w/browse/e00a649a-7eb4-40b3-9b19-f5ace7a80e08

https://circabc.europa.eu/w/browse/e00a649a-7eb4-40b3-9b19-f5ace7a80e08

Main results

Lack of knowledge at local/natonal/European level

A policy that has stll to be achieved in lots of countries

Remaining risks related to these emissions on environment and health

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Main remaining risks

Microbiological contaminaton of water

Chemical contaminaton of water and sediments

Oxygen depleton in water bodies

Marine liter/micro plastc contaminaton

5


Uncontrolled UrbanisatonMore impervious areas (more emission of pollutants)

Climate changeChange of frequency and intensity of rain events

(more emission of pollutants)

Higher seasonal reducton of the fow of rivers (less diluton)

Increase in the temperature of water bodies (acceleraton in bacteries development)

Antmicrobial resistance

Three ongoing threats

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Why is it so important to reduce storm water sewage overfows?

To implement correctly the European directves to protect environment

and people health

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Related to lots of diferent European or internatonal water regulatons:

• Under the Implementaton programme of the Urban waste water treatment directve 91/271/EC treated except

under unusually heavy rainfall

• Under the bathing water profles of the bathing water directve (BWD) 2006/7/EC Good or excellent quality

• Under the programme of measures of the Water framework directve (WFD) 2000/60/EC good ecological and

chemical status, protected areas objectves (shellfsh, bathing water, …)

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Implement EU requirements


• Under the programme of measures of the Marine Strategy Framework directve (MSFD) 2008/56/EC good environmental

status, shellfsh protecton, marine liter reducton,…

• under the inventory of the sources of polluton, the quantty of organic pollutants, the circulaton of pollutants to protect bivalve molluscs producton areas regulaton 854/2004 Insure quality for human consumpton specifcally

to avoid fecal, toxin and chemical contaminaton

• under the target of the World sustainable development goal 6 Halving the proporton of untreated waste water by 2030

• Natura 2000, groundwater, drinking water, foods, farm animal protecton,…

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Implement EU requirements


Why is it so important to reduce storm water sewage overfows

The example of E-coli contaminaton

(e.g. water leisure actvites, shellfsh consumpton, water abstracton for

agriculture)10


E-coli contamination

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1079 104

90%

10%100 104

8% UWWTP

92% CSO

1079.5 104

95%

5%50 104

16% UWWTP

84% CSO

R99%

R99%

1079.9 104

99%

1%104

91% UWWTP

9% CSO

R99%

Rain dilution 106

T 109 104

T 59.5 104

T 10.9 104

UWWTP

CSO

UWWTP

CSO

UWWTP

CSO


waterbody

Why is it so important to reduce storm water sewage overfows

More and more a politcal concern

that has to do with cites atractveness (bathing water, shellfsh, water leisure

actvites,…)12


25/08/2015

Politcal strong reacton of a mayor in France afer a beach polluton due to storm water overfows from

another city.

13

http://www.20minutes.fr/montpellier/1672575-20150825-montpellier-peut-plus-continuer-comme-ca-alerte-maire-palavas





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Storm water sewage overflows The solutions

Acton plans

Implementaton of natonal rain water overfows acton plan (artcle 17 of the UWWTD)

C h e c k t h a t measures related to this topic are implemented if there are the reason of bad quality:

in the bathing water profles of the BWD

in the programmes of measures of the WFD and MSFD.

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Monitoring measures

Building natonal storm water overfows and storage tank databases

•

establish indicators to follow the actons plans and programme of measures and identfy beter this pressure

Agglomeratons of more than 100 000 p.e.

(4% of the agglomeratons ≈ 50% of the total generated waste water load)

The solutions

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Informaton measures

Improve transparency

Implement beter alert system

at natonal/local level

to prevent contact

with contaminated water

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Agglomeraton not compliant

Bathing water in poor quality

Natura 2000


Use INSPIRE services to share the informaton and

increase knowledgeE.g. Urban waste water natonal website that

includes not only detailed informaton about urban

waste water but also EEA bathing water, Natura

2000, Soe layers

htp://uwwtd.oieau.fr/

http://inspire.ec.europa.eu/

http://uwwtd.oieau.fr/stats/graphs

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At source measuresArtcle 191 of the treaty on the functoning of

the European Union

"preventve acton should be taken"

"environmental damage should as a priority be rectfed at source"

"the polluter should pay"

The solutions

Top priority NWRMsNatural water retenton measures in urban areas

to limit the introducton of rain water in combined sewer collectng systems.

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Commission contributon: best practces website

htp://www.nwrm.eu/

The solutions

http://www.nwrm.eu/

http://www.nwrm.eu/

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NWRMs to be implemented in priority because they have mid/long term efects but provides mult

benefts…

• Improve water quality and quantty

• Improve air quality

• Improve biodiversity

• Contribute to climate mitgaton

• Contribute to fooding preventon

• Increase recreatonal areas…

Improve quality of life to all citzens

The solutions

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Other solutons have to be implemented

Optmisaton of rain storage in collectng systems

storage tank(s) related to the collectng system and/or the treatment plant

Increase in the capacity of pumping staton(s)

Increase in the capacity of the treatment plant

Increase in the capacity of the collectng system

The solutionsStorm water sewage overflows

What about building separate collectng systems?

The solutionsStorm water sewage overflows

Advantages No more combine sewage overfows if

correctly built

Disadvantages Double the cost of the collectng system

Generate bad connectons (rain in sewage system and sewage in rain drainage system)

If not treated or infltrated, polluted rain water directly discharged in water bodies (heavy metals, oil, macro and micro waste, PAH…)

Impossibility to avoid malicious acts

Acceleraton in foodings

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Excessive costsStorm water overflows

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Use the possibilites ofered by the UWWTD directve concerning excessive costs.

Annex I.A of the UWWTD

• Excessive costs have to be justfed

• It does not allow to do nothing

• It allows progressive implementaton of the projects

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CONCLUSIONStorm water overflows

What MS and local authorites have to do

A beter knowledge and transparency

A beter management of this policy

Start now implementng Natural water retenton measures

Implementaton of measures to reduce emissions under the existng regulatons

Thank you for you r a tten tion

Bruno Rakedjianbruno .raked jian@ ec .eu ropa .eu

mailto:[email protected]