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

Transcription

1 The elaboration of the Water Management Plan, state of progress and modalities 1

2 1. Le Schéma d Amd Aménagement et de Gestion des Eaux - SAGE (Local Water Management Plan) A «new» tool in France for water policy 2

3 Different scales for water management define the regulation frame Europe build a policy enacts principles Water Frame Directive (WFD /DCE) France Loire and Britanny basin Bay of Saint- Brieuc National transposal (tools, methods) Basin Committee Local water Committee SDAGE (Water management master plan) SAGE (Water management plan) Loi sur l eau (French Water law) Catchment basin communities operational programs, coordination and actions 3

4 WFD => Good ecological status of waters for 2015 planning SDAGE (Water Management Master Plan + program (Loire-Bretagne Bretagne) SAGE (local water management plan) : coordinate and set local objectives and rules SAGE Baie de Saint Brieuc actions Communities,, managers, Local basin operators 4

5 The building of SAGE (Local Water Management Plans in France 5

6 2. SAGE (Water management plan): content and principles 6

7 2. Les SAGE : content and principles SAGE Planning Rules Necessary compatibility for any administrative decision concerning water (administration authorizations,, urbain planning, etc.) enforceable to anyone Décret du 10 août 2007, Articles R à 48 du Code de l Environnement, Circulaire ministérielle du 21 avril

8 2. Les SAGE : content and principles A method : main steps to follow 1 Inventory - Diagnosis 2 Trends & scenarios choice of a common strategy 3 Building, writing of the plan Validation Approval agreement of all communities concerned,, of the Basin Committee agreement of the local French government representative Public Inquiry Local Water Committee approval Official approval by the French government - Administrative compatibility with the plan - Enforcement of the rules - Assessment of the time to reach a compatibility of previous decisions 8

9 3. The Local Water Committee (Commission Locale de l Eau) l 9

10 3. La CLE de la baie de Saint-Brieuc The Local Water Committee (CLE) «for the working out, the reviewing and the monitoring of the Water Management Plan» Article L du Code de l Environnement l (French code of environment). The composition of the local assembly is determined the law At least 50% at most : 25% users at least 25% Décret du 10 août 2007, Articles R à 48 du Code de l Environnement, Circulaire ministérielle du 21 avril

11 4. The Water Management Plan of the Bay of St-Brieuc : progression and main issues 11

12 «Environmental issues of the Water Management Master Plan (SDAGE -2009) A delay is asked for 7 of the 15 water bodies Gouëdic : 2027 Rau Etables : 2021 Islet : 2027 Gouessant aval : 2021 Gouët (artificial lake) 2021 Fond de baie : 2027 (morphology) (nitrates) (nitrates) (macropollutants, nitrates, phosphorus, morphology) (eutrophication) (nitrates eutrophication) groundwaters : 2021 (nitrates) 12

13 A SAGE is required by the SDAGE for certain key catchments 13

14 4. The Water Management Plan of the Bay of St-Brieuc : progression and main issues 14

15 15

16 4. The Water Management Plan of the Bay of St-Brieuc : progression and main issues the Main Issues 1. Providing drinkable water for a large and increasing population, maintaining local resources, preserving the main strategic resource concerned by eutrophication (P) 2. Quality of coastal waters 3. Ecological quality of rivers 4. Maintain, preserve and restore wetlands 16

17 1. Drinkable water for the area 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). 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 17

18 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 Cost/ effectiveness? 18

19 2. 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 bacteriological pollutions threatening the swimming and seafood production sites Recurrent «green tides» linked to nitrogen flows (unlimited phosphorus stocks) 19

20 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? 20

21 4. 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 21

22 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) 3. Atlas of the «reference delineation» (2009) 22

23 The «reference delineation» Location (avoiding the destruction due to urban projects : «prove that no wetland is here») Frame for field inventory and mapping (for the homogeneity of the results over the basin Diagnosis and planning (assessing territorial priorities, detecting problems at local scale) Survey (land cover changing of the delimited areas 2003 / 2008/ 23

24 2. Guide de Production de l Enveloppe l de référence r rence des zones humides Identify the different environmental contexts Combine information to detect wetlands 24

25 2. Guide de Production de l Enveloppe l de référence r rence des zones humides Precise the location (aerial rectified photographies) verify the hypothesis for each context identified 25

26 2. Guide de Production de l Enveloppe l de référence r rence des zones humides 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 26

27 Zone Gouët Zone Gouet : hydromorphie 27

28 Zone Gouët Zone Gouet : premier résultatr 28

29 Zone Gouët Zone Gouet : typologie 29

30 Zone Gouët Zone Gouet : terrain (partiel) 30

31 Results 31

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33 Périmètre SAGE Surface BASSIN Surface Modèle SPANUM Surface Hydromorphie Forte Surface Hydromorphie Forte + moyenne % 24% 37% Enveloppe Surface Comprise dans modèle SPANUM % 75% Surface prise prise hors modèle SPANUM % 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 33

34 IC et côtiers Côtiers Fréhel GOUET % % % % % % % % % % % % % % % % % % 11% 1% 27% 8% 10% 0% 20% 12% 3% 25% 16% 9% 1% 35% 3% 16% 3% 52% 12% 10% 26% detecting priorities, in relation with the measure of fluxes : where can we suspect that implementing wetland functions will be efficient? 34

35 Protection : detecting conflicts in land planning 35

36 complementary field investigations, to identify practical solutions 36

37 Contact Wilfrid MESSIEZ-POCHE de-saintbrieuc.org Estelle le PRIOL de-saintbrieuc.org de-saintbrieuc.org de-saintbrieuc.org 37

38 4. The Water Management Plan of the Bay of St-Brieuc : progression and main issues Inventory - Diagnosis Scenarios Strategy writing Approval 38