Tulsa District Regulatory Permits for Public Comment

PURPOSE:  The purpose of these public notices are to inform you of a proposal for work in which you might be interested and to solicit your comments and information to better enable us to make a reasonable decision on factors affecting the public interest.

SECTION 10: The U.S. Army Corps of Engineers is directed by Congress through Section 10 of the Rivers and Harbors Act of 1899 (33 USC 403) to regulate all work or structures in or affecting the course, condition, or capacity of navigable waters of the United States.  The intent of this law is to protect the navigable capacity of waters important to interstate commerce.

SECTION 404: The U.S. Army Corps of Engineers is directed by Congress through Section 404 of the Clean Water Act (33 USC 1344) to regulate the discharges of dredged and fill material into all waters of the United States.  These waters include lakes, rivers, streams, mudflats, sandflats, sloughs, wet meadows, natural ponds, and wetlands adjacent to other waters.  The intent of the law is to protect these waters from the indiscriminate discharge of material capable of causing pollution and to restore and maintain their chemical, physical, and biological integrity.

U.S. Army Corps of Engineers, Tulsa District

Regulatory Office, Chief



Notice of Availability of the Beta Streamflow Duration Assessment Method for the Great Plains

Regulatory Office
Published Sept. 28, 2022
Expiration date: 12/31/2022

The beta SDAM was developed for use in all or part of the states of Colorado, Illinois, Iowa, Kansas, Michigan, Minnesota, Missouri, Montana, Nebraska, New Mexico, North Dakota, Oklahoma, South Dakota, Texas, Wisconsin, and Wyoming by the Corps and EPA (Figure 1). This beta method results from a literature review and field study conducted at 251 stream reaches across the range of hydrologic landscapes of the Great Plains from 2019 to 2021. Developed through statistical analyses of the field data, it provides a data-driven approach using nine reliable indicators to determine streamflow duration class at the reach scale. The agencies are making this beta SDAM available for a one-year preliminary implementation and comment period to inform the development of a final SDAM for the Great Plains.

The beta SDAM for the Great Plains can be applied whenever there is uncertainty regarding streamflow duration class and a rapid evaluation method is desired. The method provides a scientifically supported, rapid assessment framework to support best professional judgment in a consistent, robust, repeatable, and defensible way. Use of the method may result in timelier and more predictable jurisdictional determinations and is also useful where knowledge of streamflow duration class improves ecological assessment, management, and decision-making. The beta SDAM was developed specifically from data collected in the Great Plains. Though there is a single SDAM for the entire Great Plains, the method incorporates a geographical indicator for differences between Southern Great Plains and Northern Great Plains.