Swales Holding Overflow May Be Natural Remnants of Bayou’s Original Meanders
Numerous Large Trees Cut Along Bayou Banks
June 19, 2018
Went for a stroll in the late morning heat a week ago Saturday along the south bank of Buffalo Bayou in Terry Hershey Park in west Houston. Started out on the pedestrian bridge at Eldridge Parkway and walked mostly but not always in the shade downstream. This is the area where the Harris County Flood Control District plans to remove trees and build the first of three linear detention basins at the edge of the stream to hold overflow from it.
The surprising find was that a significant amount of natural floodwater detention in the form of deep swales or depressions and levees already exists in this wooded area alongside the bayou.
Disturbingly, we also found that numerous large trees, sycamores and oaks, on both sides of the bayou recently had been pointlessly cut down, likely by Flood Control employees or by contractors clearing woody debris from the channel. Flood Control pays maintenance contractors by the weight of the wood they collect. Trees on the banks are important for protecting against erosion and cooling the stream, as well as absorbing water, among other important functions.
The Natural Path of the Bayou
The swales and depressions, filled with trees and bushes, may correspond to the original path of the bayou, once a meandering wooded stream through this 6.2-mile long linear park. In the late 1940s, in conjunction with construction of the two federal dams, Addicks and Barker, immediately upstream, the US Army Corps of Engineers razed the forest and dug a straight, artificial channel for the bayou, a costly, environmentally-destructive practice long ago abandoned because it increases flooding, among other problems.