For example the conveyance of the river increases which often slows down the velocity of water, causing more sediment to be deposited which often leads to an increase in weed growth and often a lack of plant diversity. ![]() These changes cause the natural processes of a river system to change. Water flows faster in a straightened channel so it speeds past and is less likely to flood a vulnerable area, which often just moves the problem from one place to another.Ĭhannel narrowing on the Thame at Waterstock Mill ![]() In some places the river is twice as wide and deep as it should! These modifications in most places were carried out to drain the land for agriculture. Channels are usually straightened to reduce flood risk in a specific area. River dredging and straighteningĪs a result of heavy dredging and straightening programmes over many decades, the Thame along most of its length is much wider, straighter and deeper than it would be naturally. However, these changes have created long term ecological damage to our river systems, their hydrology and the wildlife that call them home. Over thousands of years people have made changes to the physical structure of the rivers, such as altering the rivers course and installing flood defenses and weirs. Many of these changes have benefited society, for example by improving navigation, reducing flood risk, generating power and powering mills.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |