Saturday, December 21, 2019

Time to take a new look at dredging, maintenance and water policies?

From ManaSota-88, Inc.  a 501.c3 Public Health and Environmental Organization:

THE COSTS OF MAINTENANCE DREDGING

The majority of waterways originally dredged in the Sarasota & Manatee were dredged before permitting was required.  In most cases canals were dug as a source of fill for coastal wetlands to maximize the number of waterfront lots for the development. There was little or no thought given to the environmental consequences that occurred during the original dredging of these canals. As a result of inappropriate waterfront development, inadequate stormwater runoff control and habitat destruction, many of the original canals dredged have silted in and are restricting motorboat access for some waterfront property owners. 

Dredging at New Pass, Sarasota
Instead of wasting taxpayers money on environmentally damaging maintenance dredging projects, Sarasota & Manatee should instead embark on a program of habitat restoration, stormwater runoff control, and enforcement of existing best management practices to reduce the problems of erosion and siltation. 

The Florida Department of Environmental Protection (FDEP)  has adopted and frequently references a series of studies whose primary goal is to prioritize channel dredging based on the greatest need for increasing motorboat access to public waterways. This has had the effect of impairing and polluting the waters and natural resources of the State of Florida directly, secondarily, and cumulatively.

The adverse secondary impacts from boating activities (i.e. prop scars, hydrocarbon pollution, boat paints ect.), frequent maintenance dredging, and wildlife disturbance are having long-term water quality impacts.

Maintenance dredging can channelize flows and sediments can be resuspended more readily. Dredging can also destabilize adjacent areas which have developed over time through succession. Impacts to bottom sediments result in reducing the chances for successful seagrass colonization and growth within the footprint of the dredge and immediately adjacent to a new channel.

There is no reason to extend a historic dredging mistake. The need for maintenance dredging indicates that the original dredge was historically a bad idea.If siltation of the waterway is the problem, then there are soil conservation problems, inadequate stormwater runoff controls, improper agricultural practices, or inappropriate urban development within the basin. It would be better to spend money fixing the problem than temporarily trying to fix the ailment.

No comments:

Post a Comment