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GROEN RIVER ESTUARY: Physical Features |
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Topography |
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The lagoon consisting of the lower part of the estuary is about 1000m long and from 100 to 150m wide. There is a winding channel leading off at the top end of the lagoon, which turns northwards and divides around an island. The eastern branch is about 30 cm deep and the western branch is shallower. At the time of the ECRU survey there was a small side channel with a hypersaline pool on the southern side about 1km from the mouth. Beyond the island there is a big curve in the channel towards the north-east. The channel eventually divides into two narrower channels cut into the surrounding floodplain. The northern channel ends at the helicopter pad. The southern channel finishes in two pools with a dry gully extending beyong the road. (Ref 1) |
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Bathymetry |
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The maximum depth was 1,5m at the time of the ECRU visit. The deepest point was about 250m from the mouth. Most of the north-eastern part of the lagoon was about 30cm deep. In the channels in the upper reaches of the estuary, the water was about 30 cm deep. (Ref 1) |
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Obstructions |
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On the floodplain, approximately 2,5km from the mouth, a level bulldozed area and a helicopter pad encroach on the wetland source of the estuary. There are also several buildings and a windmill on the floodplain which are liable to affect management decisions at times of flood. (Ref 1) |
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