2025 2 10 Work Session PACKET 1

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ORDINANCE NO. 1138 
Page 10 of 26 
 
(a) The conveyance carries flow only in direct response to precipitation runoff in its 
immediate locality. 
(b) The conveyance’s channels are at all times above the groundwater table. 
(c) The flow carried by the conveyance is not suitable for drinking water supplies. 
(d) Hydrological and biological analyses indicate that, due to naturally occurring 
ephemeral or low flow under normal weather conditions, there is not sufficient 
water to support fish or multiple populations of obligate lotic aquatic organisms 
whose life cycle includes an aquatic phase of at least two months. (Tennessee 
Rules, Chapter 0400-40-3-.04(3)). 
14-503. Construction Stormwater Management:
  Design, Construction, and Inspection. 
(1) MS4 Stormwater Construction BMP Manual. 
(a) Adoption. The City of Athens adopts, as its MS4 stormwater construction BMP 
manual(s), the following publication(s) which are incorporated by reference in 
this ordinance as if fully set out herein: 
(i.) Metropolitan Nashville – Davidson County Stormwater Management 
Manual as amended; or, 
(ii.) City of Knoxville Stormwater BMP Manual as amended; or, 
(iii.) TDEC Erosion and Sediment Control Handbook as amended 
(b) The City of Athens has adopted the following design storm events for EPSC 
measures to be used for Construction Stormwater Control Measures. 
Depth/Intensity values shall align with NOAA Atlas data for Athens (Station 40-
0284). The EPSC and sediment BMP construction design storm events are as 
follows: 
(i.) A 2-year 24-hour design storm shall be used for sizing project EPSC and 
BMPs discharging into waters not identified as having unavailable 
parameters or Exceptional Tennessee Waters 
(ii.) A 5-year 24-hour design storm shall be used for sizing project EPSC and 
BMPs discharging into waters with unavailable parameters due to 
siltation or Exceptional Tennessee Waters 
(c) Construction requirements for design storm for all waters as well as special 
conditions for unavailable parameters waters or exceptional Tennessee waters 
shall be consistent with those of the current Tennessee Construction General 
Permit (TNR100000) as amended. 
(2) The City has adopted, for use in design of construction EPSC measures, the design storm 
requirements from the current Tennessee Construction General Permit for all waters as 
well as special conditions for unavailable parameters or Exceptional Tennessee Waters. 
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