Tennessee Hydrologic Determination

Tennessee Hydrologic Determination (HDT) and Jurisdictional Determinations (JD) are conducted by our trained field staff and follow the Tennessee Department of Environment and Conservation Division of Water Pollution ControlGuidance For Making Hydrologic Determinations. This is required by law within the state of Tennessee under the following statute.

The following is taken from the TN statute:

Public Chapter No. 464 PUBLIC ACTS, 2009 1
Tennessee Code Annotated, Section 69-3-103, is amended by
adding the following language as new, appropriately designated subsections:
( ) “Wet weather conveyance” means, notwithstanding any other law or
rule to the contrary, man-made or natural watercourses, including natural
watercourses that have been modified by channelization:
(1) That flow only in direct response to precipitation runoff in their
immediate locality;
(2) Whose channels are at all times above the groundwater table;
(3) That are not suitable for drinking water supplies; and
(4) In which hydrological and biological analyses indicate that,
under normal weather conditions, due to naturally occurring ephemeral or
low flow 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;

( ) “Obligate lotic aquatic organisms” means organisms that require
flowing water for all or almost all of the aquatic phase of their life cycles;

( ) “Stream” means a surface water that is not a wet weather conveyance;

( ) “Watercourse” means a man-made or natural hydrologic feature with a
defined linear channel which discretely conveys flowing water, as opposed to

Contact us or request a quote for your hydrologic determination today.

Jurisdictional Determination – Harlan County

Jurisdictional Determinations are conducted by BSC personnel in support of the requirements of Section 404 of the Clean Water Act (CWA) to identify “waters of the U.S.” as identified by the United States Army Corps of Engineers (USACE). Field surveys for the determination were conducted in accordance with the 1987 USACE Wetlands Delineation Manual (USACE, 1987) and the Final Regional Supplement for the Piedmont and Eastern Mountains Region (USACE, 2012). BSC investigators also evaluate the potential for federal jurisdiction under Section 404 of the CWA over aquatic features in the study area based on USACE revised guidance published December 2, 2008.

Kentucky contains seven Level III ecoregions. These ecoregions were defined by similarities in geology, physiography, vegetation, climate, soils, land use, wildlife, and hydrology. The proposed project area is located within the Central Appalachians ecoregion (69) which drains 23,698 square miles. Specifically, the project is within the Level IV ecoregion 69e (Cumberland Mountain Thrust Block) which encompasses 1,083 square miles. The topography in this area is characterized as highly dissected, hilly and mountainous plateau with steep ridges, very narrow ridge tops, narrow valleys, and deep coves. 69e contains elevations ranging from approximately 980’- 4,139’ in Kentucky and contains streams with high gradients, waterfalls, many riffles, few pools, and cobble or boulder substrates (Woods et al., 2002).


Section 404 CWA Jurisdicitonal Determination
Jurisdictional Determination