Watersysteemplan Drentsche Aa - Hunze en Aa's

Inhoudsopgave
1. Inleiding ...........................................................................................................................................1
1.1 Aanleiding..................................................................................................................................1
1.2 Doel watersysteemplan Drentsche Aa..................................................................................2
1.3 Eisen vanuit Regionaal Bestuursakkoord Water...................................................................2
1.4 Aanpak ..................................................................................................................................3
2. Gebiedsbeschrijving, beleid en ontwikkelingen.........................................................................4
2.1 Watersysteem Drentsche Aa ................................................................................................4
2.1.1 Begrenzing........................................................................................................................4
2.1.2 Karakter ............................................................................................................................4
2.1.3 Watersysteem Drentsche Aa: oppervlaktewater ..............................................................6
2.1.4 Watersysteem Drentsche Aa: grondwater........................................................................6
2.2 Beleidskader .........................................................................................................................7
2.3 Autonome ontwikkelingen .....................................................................................................9
2.3.1 Klimaatverandering...........................................................................................................9
2.3.2 Regionale ontwikkelingen .................................................................................................9
2.3.3 Lokale ontwikkelingen.....................................................................................................12
2.4 Aandachtspunten vanuit de omgeving................................................................................12
2.5 Actoren en samenwerkingsverbanden Drentsche Aa gebied.............................................13
3. Wateroverlast ..........................................................................................................................15
3.1 Huidige toestand .................................................................................................................15
3.2 Regionale wateropgave ......................................................................................................16
3.2.1 Ontlasting van de boezem ..................................................................................................16
3.3 Stedelijke wateropgave.......................................................................................................17
3.3.1 Wateroverlast vanuit het oppervlaktewater.........................................................................17
3.3.2 Water op straat....................................................................................................................18
3.3.3 Grondwateroverlast.............................................................................................................19
4. Watertekort...............................................................................................................................21
4.1 Droogte................................................................................................................................21
4.2 Verdroging...........................................................................................................................22
5. Waterkwaliteit ..........................................................................................................................24
5.1 Waterkwaliteitstrends in het stroomgebied van de Drentsche Aa ......................................24
5.2 Europese Kaderrichtlijn Water ............................................................................................29
5.2.1 Ecologische en chemische toestand van het waterlichaam Drentsche Aa ....................29
5.2.2 Ecologische en chemische toestand van het waterlichaam Noord-Willemkanaal .........31
5.2.3 Grondwaterkwaliteit ........................................................................................................32
5.3 Kwaliteit overige wateren (niet KRW) .................................................................................33
5.4 Stedelijk water.....................................................................................................................33
6 Waterbodems................................................................................................................................36
7 Samenvatting wateropgaven Drentsche Aa............................................................................39
7.1 Wateroverlast ......................................................................................................................39
7.2 Watertekort..........................................................................................................................39
7.3 Waterkwaliteit......................................................................................................................39
8 Strategie en maatregelen Drentsche Aa.......................................................................................41
8.1 Inleiding ...................................................................................................................................41
8.2 Uitgangspunten en keuzen......................................................................................................41
Watersysteemplan Drentsche Aa