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| Ergolz | |
|---|---|
 The Ergolz at Sissach | |
 | |
| Location | |
| Country | Switzerland |
| Location | Basel-Landschaft |
| Physical characteristics | |
| Source | |
| • location | Schafmatt, Greisflue,Rohr, Solothurn |
| • coordinates | 47°25′26″N7°57′34″E / 47.42389°N 7.95944°E /47.42389; 7.95944 |
| • elevation | 830 m (2,720 ft) |
| Mouth | |
• location | Confluence withRhine betweenAugst andKaiseraugst |
• coordinates | 47°32′17″N7°42′50″E / 47.53806°N 7.71386°E /47.53806; 7.71386 |
| Basin size | 261 km2 (101 sq mi) |
| Discharge | |
| • average | 3.73 m3/s (132 cu ft/s) |
| Basin features | |
| Progression | Rhine→North Sea |
TheErgolz is the main river in the canton ofBasel-Landschaft,Switzerland. It rises on Mount Geisflue in theFaltenjura mountains in the upper region of Basel-Landschaft, on the border withAargau andSolothurn, and joins theRhine atAugst. Among the tributaries of the Ergolz areEibach,Homburgerbach,Diegterbach,Frenke (Anterior and Posterior Frenke),Orisbach,Röserenbach andViolenbach [de].
Since 1934 the water level and discharge of the Ergolz have been measured atLiestal. During these more than 70 years, the average flow towards the Rhine was 3.73 cubic metres per second (132 cu ft/s). During 2006, the average flow was 5.63 cubic metres per second (199 cu ft/s). The peak in that year was on 10 April 2006, at 134 cubic metres per second (4,700 cu ft/s). The extreme values measured at Liestal were a minimum of 0.1 cubic metres per second (3.5 cu ft/s) (in 1947) and a maximum of 155 cubic metres per second (5,500 cu ft/s) (in 1999).
The river supplied drinking water to theRoman city ofAugusta Raurica. To this end, anaqueduct was constructed, which began upstream of today's Liestal. Parts of the aqueduct still stand today. Two places where the aqueduct can be visited and walked today, are in theHeidenloch district of Liestal and north-east of the sewage treatment plant inFüllinsdorf.
The Ergolz was increasinglypolluted during the first half of the 20th century. From 1960 onwards, pollution was countered by the construction of sewage treatment plants.
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