The elaboration of the Water Management Plan, state of progress and modalities

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1

The elaboration of the Water Management

Plan,

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2

1.

1. Le Sch

Le Sch

é

ma d

’

Am

é

nagement et de Gestion

des Eaux

-

SAGE

(Local Water Management Plan)

A

(3)

3

Different scales for water management define the regulation fram

e

Europe

Water Frame Directive

(WFD /DCE)

build a policy

enacts principles

Basin Committee

Loire and

Britanny

basin

SDAGE

(Water management master plan)

National transposal (tools, methods)

_{Loi sur l’eau}

(French Water law)

France

operational programs,

coordination and actions

Catchment basin

communities

Local water Committee

Bay of

(4)

4

SAGE

(local water management plan)

:

coordinate

coordinate and set and set local objectives local objectives and

and rulesrules

SAGE Baie de Saint Brieuc

p la n n in g p la n n in g a c ti o n s a c ti o n s

WFD => Good

ecological

status

of waters for 2015

SDAGE

(Water Management Master Plan

+ program (Loire

+ program (Loire--BretagneBretagne))

Communities

, managers,

Local basin

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5

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2. SAGE

(Water management plan):(Water management plan):

content and

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7

SAGE

Rules

Planning

Necessary

compatibility for

any

administrative

decision

concerning

water

(administration

(administration authorizationsauthorizations, urbain , urbain planning, etc.)

planning, etc.)

enforceable

to

anyone

2. Les SAGE : content and

2. Les SAGE : content and principlesprinciples

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8

A

method

: main

steps

to

follow

1

1 Inventory

Inventory

-

Diagnosis

2 Trends & scenarios

2 Trends & scenarios –

–

choice

of a common

of a

common

strategy

3 Building,

3 Building, writing

writing

of the plan –

of the plan

–

Validation

Approval

Approval –– agreement of all agreement of all communitiescommunities concerned, of concerned, of the Basin

the Basin CommitteeCommittee –

– agreement of the local French governmentagreement of the local French government representative

representative –

– Public Public InquiryInquiry –

– Local Water CommitteeLocal Water Committee approvalapproval –

– Official approvalOfficial approval by the French by the French governmentgovernment

-- Administrative compatibility Administrative compatibility withwith the planthe plan

-- EnforcementEnforcement of the of the rulesrules

-- AssessmentAssessment of the time to of the time to reachreach a compatibility of a compatibility of previous

previous decisionsdecisions

2. Les SAGE : content and

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3. The Local Water

Committee

(Commission Locale de l

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10

The Local Water

Committee

(CLE

)

«

for the

working

out, the

reviewing

and the monitoring of the Water

Management Plan

…»

Article L 212

Article L 212--4 du Code de l4 du Code de l’’Environnement (French code of Environnement (French code of environmentenvironment).).

The composition of the local

assembly

is

determined

the

law

Décret du 10 août 2007, Articles R 212-26 à 48 du Code de l’Environnement, Circulaire ministérielle du 21 avril 2008.

3. La CLE de la baie de Saint

3. La CLE de la baie de Saint--BrieucBrieuc

at most : 25% At least 50%

at least 25%

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4. The Water Management Plan of the

Bay

of St

-

Brieuc :

progression and main issues

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12

Gouëdic : 2027 (morphology)

Rau Etables : 2021 (nitrates)

Islet : 2027 (nitrates)

Gouessant aval : 2021 (macropollutants, nitrates, phosphorus, morphology)

Gouët (artificial lake) 2021 (eutrophication)

Fond de baie : 2027 (nitrates – eutrophication)

groundwaters : 2021

(nitrates)

«

Environmental issues of the Water Management

Master Plan (SDAGE -2009)

A delay is asked for 7 of the 15 water bodies

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4.

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1.

1. Providing

Providing

drinkable

water

for a large and

increasing

population

, maintaining local resources, preserving the main

strategic resource concerned by eutrophication (P)

the Main Issues

4.

4. Maintain

Maintain

,

preserve

and restore

wetlands

3.

3. Ecological

Ecological

quality

of

rivers

2.

2. Quality

Quality

of

coastal

waters

4.

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1.

1. Drinkable

Drinkable

water for the area

Small streams and fragile resources, (4 already closed, 3 in litigation (nitrates Directive), low summer flows limiting the production

Frequent detection of pesticides before treatment

A main resource (8 M m3/year) to maintain and secure, linked to a dam and therefore concerned by eutrophication with algal blooms and toxicity risks (cyanobacterias).

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Complex

scenario :

limiting

the eutrophication of an

artificial

lake

⇒ ⇒⇒

⇒ agriculture is the main source of phosphorus on the

basin

• stopping the P enrichment of soils (balanced

fertilization including P – measure decided in the SDAGE) • managing landscape infrastructures limiting the

transportation of P (fields boundaries, hedges, riparian

zones… including modification of plot plan)

• increasing wastewater treatment performances • Curage, dredging of the lake to stop the inner

production

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2.

2. Coastal

Coastal

water

quality

Important seafood production, very dependent of coastal water quality

A global economic attractivity, a touristic development of the territory linked to its coastal qualities

Recurrent « green tides » linked to nitrogen flows (unlimited phosphorus stocks)

bacteriological pollutions threatening the swimming and seafood production sites

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Complex

scenario : green

tides

agriculture scenarios to reduce nitrogen fluxes

towards the bay

1. 1st Scenario : by the optimization of current agricultural systems, contracting or regulation), what decrease of flux can we expect ? - 20, -30 % in more than 10 years ?

2. 2d Scenario : the necessary goal is -60 % of fluxes: what do we have to do ? Export of manure,

changing of crop successions, decreasing of animal production : which imply a higher value for the

products…

3. 3rd Scenario mix of the previous ones on the

territory according to the weakness of the areas : -30 % of flows ?

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4.

4. Maintain, preserve and restore wetlands

Maintain, preserve and restore wetlands

Important urban development, still destroying wetlands

these lands are not generally taken into account in farming practises

… and essential to reach the targets of nutrient fluxes

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The

work

done

1. Method to identify the areas of high probability to find wetlands (2007) : the « reference delineation of

wetlands »

2. Method and tools for explaining the functions, field

inventory and mapping of wetlands and streams (2008)

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• Frame for field inventory and mapping (for the homogeneity of the results over the basin

• Location (avoiding the destruction due to urban projects : « prove that no wetland is here »)

• Survey (land cover changing of the delimited areas 2003 / 2008/… • Diagnosis and planning (assessing territorial priorities, detecting problems at local scale)

The

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2. Guide de Production de l

2. Guide de Production de l’’Enveloppe de rEnveloppe de rééfféérence des zones humidesrence des zones humides

Identify the different environmental contexts

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Precise the location (aerial rectified photographies)

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the work is done at the scale of the

smallest unities of the water system It needs GIS tools that can be shared, or free access

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Zone Gouet :

hydromorphie

_hydromorphie

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Zone Gouet : premier r

é

_é

sultat

_sultat

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Zone Gouet : typologie

Zone Gouët

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Zone Gouet : terrain (partiel)

Zone Gouët

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Results

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Plans d'eau et leurs bordures Autres boisements

Peupleraies

Surfaces cultivées (cultures) Autres surfaces artificialisées Surfaces en herbe a priori non cultivées

Friches, landes, plantations

Surface prise prise hors modèle SPANUM Surface Comprise dans modèle SPANUM

Enveloppe

Surface Hydromorphie Forte + moyenne

Surface Hydromorphie Forte Surface Modèle SPANUM

Surface BASSIN 27% 5 721 75% 15 989 19% 21438 37% 41 000 24% 26 496 22% 24 724 111 440 Périmètre SAGE

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34 14708 2885 20% 2571 17% 4671 32% 2280 16% 1465 64% 801 35% IC et côtiers 1% 27% 3% 26% 16% 16% 11% 2193 748 34% 398 18% 878 40% 448 20% 475 106% 184 41% Côtiers Fréhel 0% 20% 1% 52% 9% 8% 10% 26403 4416 17% 5453 21% 7008 27% 4780 18% 3061 64% 1708 36% GOUET 3% 25% 3% 10% 12% 35% 12%

detecting priorities, in relation with the measure of fluxes : where can we suspect that implementing wetland functions will be efficient ?

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complementary field investigations, to identify practical solutions

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•

• Wilfrid MESSIEZ-Wilfrid MESSIEZ-POCHEPOCHE 02 96 58 62 3102 96 58 62 31 sage@pays

[email protected] •

• Estelle le PRIOLEstelle le PRIOL 02 96 58 62 2302 96 58 62 23 info.sage@pays

[email protected]

www.pays

-

de

-

saintbrieuc.org

http://intranet.pays

-

de

-

saintbrieuc.org

Contact

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4.

4. The Water Management Plan of the Bay of StThe Water Management Plan of the Bay of St--Brieuc : progression and main issuesBrieuc : progression and main issues

Inventory Inventory - -Diagnosis Diagnosis Scenarios Scenarios Strategy Strategy writing