Criteria for the Depths of Dredged Navigational Channels (1983) / Chapter Skim
Currently Skimming:
Regulatory and Institutional Considerations
Regulatory and Institutional Considerations
Pages 13-22
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From page 13... ...
95-269) , the Corps initiated a Minimum Dredge Fleet for purposes of national security or defense, preserving sufficient work to keep the fleet operational, and allowed private industry to bid on all other dredging work.
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From page 14... ...
of the U.S. Army Corps of Engineers examines several engineering options, as well as their costs and benefits, and prepares reports, including environmental impact statements, for various levels of internal and external approval.
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From page 15... ...
plan for proposal in hi 1- ~ibi lip 0 =~ ~~ Hi (ma ~ ~ ( 15 has prior to late state publ lc "eeti ng 0 N~ mat 10 11 12 o Reviews consents o Reviews o Considers Vie.e of o Aevie.e B~ ad rearm ~ ~ ~ ~ ~ - ~ ~ ~ _ o Prepares r~n~ - Film F as arm: isle - States o Distributes for ~tel~ remix - Fang EIS - f inal EIS - agencies o Files f inal EIS with EP^ - F1na1 FA o Issues public notice o Reviews and provides o Circulates to public for 30-day requesting public views recommendations review period and to be sent to Ward of - Final E1S governors, federal d_rt.ents - ~1 Har~r.
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From page 16... ...
states for determining the depths of channels: The channel depth must be adequate for the design vessel draft, squat, trim, sinkage due to fresh water conditions, location of salt water intakes on ship, wave action and appropriate under keel clearance. Minimum under keel clearance should be two feet for soft channel bottoms and three feet for hard channel bottoms.
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From page 17... ...
, as pointed out in the Engineer Manual, is a crucial one, and this is clarified by the Engineer Regulation as "selected from comprehensive planning studies of the various types and sizes of vessels expected to transit the channel...over the economic life of the project...." Usually the largest vessel of the major commodity movers, it "is selected by evaluating tradeoffs of delay cost incurred by larger vessels and cost of increased channel dimensions. The maximum size vessel and least maneuverable vessel in the fleet must be able to make a safe transit [taking into account special conditions that may be imposed -- for example, speed limits' use of high tides for additional water depth, one-way traffic, tug assistance!
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From page 18... ...
The first report discusses : the evidence from questionnaire surveys of Corps districts respecting overdredged depths (or "overdepth dredgings. Overdredged depths are of two types (see Figure 2~: One is the "allowable pay overdepth," an additional depth for which the Corps agrees to pay the dredger to ensure that the design depth is achieved -- that is, allowing for the inaccuracies of dredging and surveying.
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From page 19... ...
dredged channel with allowable pay overdepth and advance maintenance dredg~ng overdepth WAJER SURfACE _ ~ ~ _ n—T11~4 ~_ DEP~ ~ AU - ORJZED OR RE~ R")
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From page 20... ...
o o' o o, ~4 ~4 o v A 4~ of o In en ~ 4 C ~ a, S O ~ U]
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From page 21... ...
Some of this may be undertaken by the districts on passage of the legislation authorizing a navigational project -- for example, model and simulation testing of the channel design for various vessels and unique features of the local environment -- as their budgets allow. Model tests, simulations, and intensive local data collection are generally expensive.
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