Pollution entering Franklin’s streams and channels has many sources and entry paths. Pollutants are generally either washed into surface waters by rainfall runoff or they enter through human activities such as connecting non-storm water drains to the storm water drainage system or by someone dumping waste into drains or streams directly. Franklin has programs of education, prevention and inspection to address these environmental concerns. Rainfall induced pollution enters primarily by two methods. The first is erosion and sedimentation of sediment and the pollutants sediment contains. The second is the simple wash off of pollution that may lie on paved surfaces.
There are negative influences on channels, streams and rivers when sediment enters the waterways. As sediment volumes increase in waterways, the overall capacity decreases. This causes an increase in flooding as well as creates excessive maintenance needs. There are different types of erosion that are also cause for concern, such as water and wind erosion. Construction activities often require the disturbance of streams and channels. Once vegetation or other bank protection measures are disturbed, flows may begin to erode the unprotected soil. Dust is a common concern from construction sites and originates as inorganic particle pollution from rock and soil surfaces and material storage piles. The majority of dust generated and emitted into the air at a construction site is related to earth moving operations, demolition, construction traffic on unpaved surfaces, and wind over disturbed soil surfaces. There are five primary factors that influence erosion: soil characteristics, vegetative cover, topography, climate, and rainfall.
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The City of Franklin’s Stormwater and Erosion Origins