Vann i Stavanger 2018‐2029 ____________________________________________________ Hovedplan for vannforsyning, avløp, vannmiljø og overvann HØRINGSUTKAST Oktober 2018 1 HØRINGSUTKAST SEPTEMBER 2018 DETTE PLANDIKUMENTET ER HØRINGSUTKASTET AV «VANN I STAVANGER 2018‐2029». ETTER HØRINGEN VIL PLANEN BLI JUSTERT OG TILPASSET VEDTAK OG INNSPILL. VIDERE VIL PLANEN BLI OPPARBEIDET GRAFISK FØR ANDREGANGSBEHANDLING I KOMMUNALSTYRET OG ENDELIG VEDTAK I BYSTYRET. 2 Innhold Planens hovedgrep (sammendrag) ..................................................................................................................................... 5 1 Innledning ....................................................................................................................................................................... 9 1.1 Visjoner og verdier .......................................................................................................................................................... 9 1.2 Overordnede planer ........................................................................................................................................................ 9 1.3 Generelle fokusområder ................................................................................................................................................ 10 1.4 Benchmarking ................................................................................................................................................................ 11 1.5 Status for gjennomføring av gjeldende plan .................................................................................................................. 11 1.6 Vann i Nye Stavanger kommune ................................................................................................................................... 12 2 Vannforsyning ............................................................................................................................................................... 13 2.1 Mål og strategier ........................................................................................................................................................... 13 2.2 Godt, nok og sikkert vann fra IVAR ................................................................................................................................ 13 2.2.1 Råvannskilder ........................................................................................................................................................ 14 2.2.2 Vannbehandling ..................................................................................................................................................... 14 2.2.3 Transportsystemet ................................................................................................................................................. 14 2.2.4 Reserve‐ og nødvannsforsyning ............................................................................................................................. 15 2.3 Drift av vannledningsnettet ........................................................................................................................................... 15 2.4 Forsterke vannledningsnettet ....................................................................................................................................... 17 2.4.1 Økt forsyningssikkerhet – nye ledninger ............................................................................................................... 17 2.4.2 Økt minstevanntrykk ............................................................................................................................................. 17 2.4.3 Brannvannsdekning ............................................................................................................................................... 18 2.5 Fornyelse av vannledningsnettet ................................................................................................................................... 18 2.5.1 Fornyelsestakt ....................................................................................................................................................... 19 2.5.2 Metoder for fornyelse ........................................................................................................................................... 19 2.5.3 Prioritering av fornyelsestiltak ............................................................................................................................... 19 2.6 Lekkasjereduksjon ......................................................................................................................................................... 20 3 Avløp ............................................................................................................................................................................ 24 3.1 Mål og strategier ........................................................................................................................................................... 24 3.2 Rensing av kommunalt avløpsvann ............................................................................................................................... 24 3.2.1 Sentralrenseanlegget på Nord‐Jæren .................................................................................................................... 24 3.2.2 Kommunale renseanlegg ....................................................................................................................................... 25 3.2.3 Sanere direkte avløpsutslipp ................................................................................................................................. 26 3.3 Drift av avløpsnettet ...................................................................................................................................................... 27 3.4 Separering og fremmedvann ......................................................................................................................................... 27 3.5 Fornyelse av ledningsnettet .......................................................................................................................................... 30 3.5.1 Fornyelsestakt ....................................................................................................................................................... 30 3.5.2 Metoder for fornyelse ........................................................................................................................................... 31 3.5.3 Prioritering av fornyelsestiltak ............................................................................................................................... 31 3.6 Oppfølging av overløp ................................................................................................................................................... 32 3.7 Kontroll med påslipp til kommunalt nett ....................................................................................................................... 32 3.8 Kontroll med avløp i spredt bebyggelse ........................................................................................................................ 33 3 4 Overvann og klimatilpasning ......................................................................................................................................... 34 4.1 Helhetlig tilnærming ...................................................................................................................................................... 34 4.2 Tverrfaglig innsats med tydelig sektoransvar ................................................................................................................ 35 4.2.1 Tverrfaglig innsats .................................................................................................................................................. 35 4.2.2 Avklaring av sektorenes ansvar ............................................................................................................................. 35 4.3 Systematisk arbeid for å sikre kapasiteten i overvannsnettet ....................................................................................... 36 4.4 Sikre trygg flomavledning i utsatte områder ................................................................................................................. 37 4.4.1 Flomveikartlegging ................................................................................................................................................ 37 4.4.2 Skybruddsplan ....................................................................................................................................................... 38 5 Vannmiljø ..................................................................................................................................................................... 39 5.1 Mål og strategier ........................................................................................................................................................... 39 5.2 Vannforskriften .............................................................................................................................................................. 39 5.3 Tverrfaglig samarbeid 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