EP 1130-2-520
29 Nov 96
CHAPTER 8 - DREDGING
8-1. Purpose. This chapter establishes guidance governing accomplishment of dredging at
USACE projects.
8-2. Applicability. This chapter applies to all USACE commands performing and/or managing
dredging. MSC commanders are authorized to develop specific written guidance to supplement
ER 1130-2-520, Chapter 8, Dredging, as necessary, provided, they are fully consistent with the
policies in that regulation and guidance in this pamphlet.
8-3. General. Subjects covered in this chapter include the performance of dredging contracts,
navigation channel conditions, CERF, CEMDC, small business dredging program, inspection of
dredging operations, and plant operations reports.
8-4. Definitions. An explanation of dredging terms applicable to this regulation is contained in
the USACE Dredging Desk Reference.
8-5. Performance of Dredging.
a. Project Dimensions: A sectional view of the required prism and technology indicating
project dimensions and quantity of material considerations are shown in Figure G-1, Appendix G,
ER 1110-2-1302. Detailed descriptions of definitions used for the required pay prism are also
provided in Appendix G.
(1) Authorized navigation projects will be maintained to full constructed channel
dimensions when feasible and justified. See Figure #1 in Appendix Y.
(2) Allowable overdepth dredging (depth and/or width) outside the required prism is
permitted to allow for inaccuracies in the dredging process. Allowable overdepth in excess of
two feet or the use of zero allowable overdepth requires the prior approval of the MSC
commander. See Figure #2 in Appendix Y.
(3) Written justification for advanced maintenance dredging is required. As a minimum,
the justification for advance maintenance should describe historical shoaling rates, frequency of
dredging, and cost analysis. Advance maintenance shall not be used to provide navigation channel
dimensions for vessels that exceed the design limitations of the project. Before using advance
maintenance, the integrity of structures adjacent to the channel and the possibility of the existence
of material in the advance maintenance portion of the channel as significantly different from
maintenance material should be reviewed. See Figure #3 in Appendix Y.
(4) Unless otherwise provided in the project authorization documents, depths and widths
will be construed as actual dredging limits (exclusive of allowable overdepth and advanced
maintenance dredging) and not the draft and width limits of any vessel to be accommodated.
b. Side Slopes. Side slopes may be dredged by:
(1) Dredging along the slope of the required dimension.
8-1
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