Kortlægning af grundvandsressourcen ved Holstebro

INDHOLDSFORTEGNELSE
Indholdsfortegnelse
1 Indledning................................................................................................................... 11
2 Beskrivelse af området .............................................................................................. 13
2.1 Generelt om kortlægningsområdet........................................................................ 13
2.2 Tidligere undersøgelser......................................................................................... 14
2.3 Geologiske forhold ............................................................................................... 17
2.3.1 Baggrund........................................................................................................ 17
2.3.2 Landskabsbeskrivelse .................................................................................... 18
2.3.3 Begravede dale............................................................................................... 27
2.3.4 Prækvartæroverfladen.................................................................................... 29
2.3.5 Salttektonik .................................................................................................... 30
2.3.6 Redoxforhold ................................................................................................. 30
2.3.7 Prækvartære aflejringer.................................................................................. 32
2.3.8 Geologisk ramme for Kvartær ....................................................................... 39
2.3.9 Konceptuel geologisk ramme (hydrogeologisk tolkningsmodel).................. 40
2.4 Hydrologiske forhold............................................................................................ 51
2.4.1 Vandløb og søer............................................................................................. 51
2.4.2 Nedbør og grundvandsdannelse..................................................................... 53
2.4.3 Grundvandsdannelse til magasinerne ............................................................ 54
2.4.4 Vandindvinding og vandforsyningsstruktur .................................................. 59
2.4.5 Potentialeforhold............................................................................................ 63
2.4.6 Indvindingsoplande og beregningsmetode .................................................... 67
2.5 Grundvandskemi................................................................................................... 71
2.5.1 Datagrundlag.................................................................................................. 71
2.5.2 Nitrat .............................................................................................................. 72
2.5.3 Sulfat.............................................................................................................. 75
2.5.4 Vandtype........................................................................................................ 77
2.5.5 Brunt vand...................................................................................................... 79
2.5.6 Andre parametre ............................................................................................ 81
2.5.7 Miljøfremmede stoffer................................................................................... 87
2.6 Jordforurening....................................................................................................... 92
2.7 Arealanvendelse.................................................................................................... 93
2.8 Nitratbelastning..................................................................................................... 97
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