Sedges & Reeds

Sedges and Reeds are superficially similar, but actually quite different. But unless you are a biologist - who cares? ( Reeds are grasses, sedges are sedges. )

Sedges

Sedges tolerate a wide range of salinity, from freshwater to seawater, although they seem to grow best in brackish water. So, like above, if you are exploring a bay or inlet, that stuff all around you is most likely sedge.

Channels like the one above are not natural, they are cut primarily for mosquito control. Mosquito larvae need still water, and the tidal flow helps flush them out, while also allowing access for fish to feed on them. That's the idea, but it is not 100% effective, so bring your bug spray.

-- Wikipedia


Reeds

One well-known reed is the Cattail. This member of the grass family tolerates brackish water, but is found most often in fresh.

Cattail bloom

-- Wikipedia


A weir or low-head dam is a barrier across the width of a river that alters the flow characteristics of water and usually results in a change in the height of the river level. Weirs are also used to control the flow of water for outlets of lakes, ponds, and reservoirs. There are many weir designs, but commonly water flows freely over the top of the weir crest before cascading down to a lower level.

Even though the water around weirs can often appear relatively calm, they can be extremely dangerous places to boat, swim, or wade, as the circulation patterns on the downstream side - typically called a hydraulic jump - can submerge a person indefinitely. This phenomenon is so well known to canoeists, kayakers, and others who spend time on rivers that they even have a rueful name for weirs: "drowning machines".

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