River Rhondda
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River Rhondda Afon Rhondda |
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 Confluence of the Rhondda and Taff rivers in Pontypridd |
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| Data | ||
| location | Rhondda Cynon Taf , UK | |
| River system | River Taff | |
| Drain over | River Taff → Bristol Channel | |
| Confluence of |
Rhondda Fawr and Rhondda Fach at Porth 51 ° 36 ′ 50 " N , 3 ° 24 ′ 38" W. |
|
| Source height | 110 m | |
| muzzle | in the River Taff coordinates: 51 ° 36 ′ 1 ″ N , 3 ° 20 ′ 26 ″ W 51 ° 36 ′ 1 ″ N , 3 ° 20 ′ 26 ″ W. |
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| Mouth height | 68 m | |
| Height difference | 42 m | |
| Bottom slope | 8.4 ‰ | |
| length | 5 km | |
| Medium-sized cities | Pontypridd | |
| Small towns | Porth | |
| Rhondda Fawr | ||
| location | Rhondda Cynon Taf in Wales | |
| River system | River Taff | |
| source | Ffynnon-y-Gwalciau 51 ° 42 '12 " N , 3 ° 33' 59" W. |
|
| Source height | 544 m | |
| Confluence with | Rhondda Fawr to the River Rhondda 51 ° 36 ′ 50 " N , 3 ° 24 ′ 38" W |
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| Mouth height | 110 m | |
| Height difference | 434 m | |
| Bottom slope | 17 ‰ | |
| length | 25 km | |
| Rhondda compartment | ||
| location | Rhondda Cynon Taf in Wales | |
| River system | River Taff | |
| source | between Mynydd Beili-glas and Mynydd Bwllfa 51 ° 42 ′ 41 ″ N , 3 ° 32 ′ 27 ″ W. |
|
| Source height | 489 m | |
| Confluence with | Rhondda Fawr to the River Rhondda 51 ° 36 ′ 50 " N , 3 ° 24 ′ 38" W |
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| Mouth height | 110 m | |
| Height difference | 379 m | |
| Bottom slope | 15 ‰ | |
| length | 25 km | |
The River Rhondda ( Welsh Afon Rhondda [ ˈavɔn ˈr̥ɔnða ]) is a river in Wales .
The River Rhondda has two headwaters, the southern Rhondda Fawr (English Great Rhondda ) and the northern Rhondda Fach (English Little Rhondda ). Both rivers have their source in the Glamorgan Mountains . and flow through narrow, usually less than 400 m wide and deeply cut valleys in a southeastern direction. The two valleys are separated from each other by the up to 481 m high mountain range Cefn-y-Rhondda and Mynydd Maerdy . The two rivers flow together at Porth and flow into the River Taff about five kilometers east at Pontypridd .
From the second half of the 19th century, the Rhondda valley developed into one of the largest coal mining areas in the world, and as the Rhondda Valley it became a synonym for coal mining in the South Welsh valleys . For decades, the numerous mines as well as the residents discharged their sewage untreated into the river, which was thus heavily polluted. Only with the end of mining in the 1970s did the water quality improve again.
