Document: NUREG-0800
Document ID: 496b5bd8-c9a2-4cf6-a703-e41c51e155ec
Document Type: srp
Title: CHANNEL MIGRATION OR DIVERSION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1819/ML18190A201.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.9
CFR Part: 
CFR Title: 

Content:
8), for example.] The U.S. Geological Survey’s (USGS’s) historic topographic map geospatial database7 can be accessed to identify the earliest maps published for the area and then inspecting those maps for geomorphic evidence of channel migration or diversion. Staff could use additional sources of information to obtain historical and potential channel migration or diversion activity include aerial photographs, satellite imagery and other remotely- sensed geospatial data. When reviewed in time series, remotely-sensed geospatial data can help to illustrate temporal changes, over a span of decades, in the locations of streams and/or rivers and in doing so help to confirm whether this flood-causing mechanism is present at a particular site. Lastly, staff should confirm that the applicant has investigated whether there are any ongoing or planned land-use or water management activities or environmental actions that might affect the course, characteristics, or flow rates of any streams and/or rivers contiguous to the power plant site. This would include activities or actions at locations above and below the power plant site. This information can be obtained from those cognizant Federal and State authorities with responsibilities for these concerns in the region of interest. 1. Historic Accounts of Channel Migration: The literature should be reviewed to determine if there are historic accounts describing past episodes of diversion, migration, or realignment of natural waterways in the region. Publications of the USGS, the U.S. Army Corps of Engineers (USACE), USACE Engineer Research, National Cooperative Highway Research Program (NCHRP) of the Transportation Research Board, State highway departments and other authoritative sources should be examined to identify past events and the potential for future channel migration or diversion in the region. The phrase “channel diversions” is not commonly used in the literature, so the literature search should include other