Aldine-Westfield Stormwater Detention Basin, Harris County Flood Control District (Under Subcontract with IDCUS), Harris County, Texas

Houston,TX

Under contract with IDCUS, R. G. Miller Engineers, Inc. (RGME) conducted Section 404 wetlands delineation work on a 136-acre detention basin site and ordinary high water mark (OHWM) identifications along 7,340 linear feet of adjacent bayous or channels.

The purpose of the investigation was to identify, classify, and document the location and extent of all potential waters of the United States (WOUS) including waterbodies and wetlands, within the proposed project area through the delineation of the boundary of such features. The OHWM of the channels in the project vicinity was also defined to establish the extent of USACE jurisdiction in those waterways. As part of this investigation, determinations were made whether these featured are considered potential WOUS, as defined by Section 404 of the CWA and/or Section 10 of the RHA, subject to the jurisdiction of the USAC Galveston District and USEPA. This information was obtained through both desktop and field investigations.

RGME conducted all field work in January 2017. Site areas were assessed as wetland or upland using physical observation of wetland hydrology indicators, presence of hydric soils, and prevalence of hydrophytic vegetation as described in Corps of Engineers Wetlands Delineation Manual (1987 Manual) and the Supplement to the Corps of Engineers Wetland Delineation Manual: Atlantic and Gulf Coastal Plain Region, Version 2 (Regional Supplement).  Ordinary high water marks was identified through the observation of physical characteristics such as natural impression on the bank, shelving, changes in the soil character, destruction of terrestrial vegetation, litter or debris, or other appropriate means that consider the surrounding areas. The OHWM of streams in the project location was identified using these characteristics as well as using the Ordinary High Water Mark Delineation Manual for Section 404 Water by Harris County Flood Control District, October 2005 for further guidance.  A formal pre-verification report was prepared and finalized to address HCFCD comments.

RGME prepared a formal request for an Approved Jurisdictional Determination from the USACE and upon receipt prepared a formal verified delineation report for the project records.  RGME prepared an Individual Permit Application and assisted in obtaining a permit from the USACE in only 7 months.

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