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Development of an Ultimate Oxygen Demand ( TMDL) for Floyd's Fork and its Tributaries

Floyds Fork was placed on 303 (d) lists (1990, 1992, 1994) not meeting its water quality uses. Measurements and observations in 1991 demonstrated that approximately 13 miles of Floyds Fork (primarily below the Oldham/Shelby County line) did not meet Kentucky's criteria for dissolved oxygen (daily average DO cannot be less than 5 mg/L with no instantaneous levels below 4 mg/L). Other areas of Floyds Fork also exhibited problems, mostly with algal blooms in quiescent pools. The main stem of Floyds Fork has slopes that are moderate to nearly flat (low slope streams do not have a high capacity to assimilate wastewater discharge). The natural 7Q10 of Floyds Fork is 0 cfs. Water flows vary due to water withdrawals and varying amounts of wastewater discharge from approximately 60 package plants. During low flow events, DO violations occur below lower Chenoweth Run, Cedar Creek, and Brooks Run due to the input of wastewater effluent. QUAL2EU (a one-dimensional, steady state DO model) was used to develop a TMDL for oxygen-consuming wastes in Floyds Fork.

[1997 Development of an Ultimate Oxygen Demand TMDL for Floyds Fork and its Tributaries]

Development of a Total Phosphorus TMDL for Chenoweth Run (Phase I)

Nutrient enrichment has been a problem in Chenoweth Run and in Floyds Fork below Chenoweth Run.Chenoweth Run was included on the 1992 and 1994 303(d) lists as a water body not meeting water quality uses. Organic enrichment and nutrients were identified as causes of impairment. Dense algal mats form in Chenoweth Run and in downstream water bodies as a result of excessive phosphorus discharge. Chenoweth Run should support warmwater aquatic habitats. This use specifies that surface waters not be aesthetically or otherwise degraded by substances that produce undesirable life or result in the dominance of nuisance species. Under low flow conditions, most of the stream flow comes from wastewater discharge. In-stream water quality data showed a significant increase in total phosphorus downstream of the Jeffersontown wastewater treatment plant. Development in the watershed has resulted in clear-cutting of trees in the riparian zone around Chenoweth Run. Stormwater runoff also increased dramatically. A water quality assessment of Chenoweth Run resulted in the recommendation of limiting total phosphorus to 1 mg/L at the Jeffersontown WWTP.

[1997 Development of a Total Phosphorus TMDL for Chenoweth Run (Phase I)]


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