UFC 4-213-10
15 August 2002
CHAPTER 6
FLOODING
6-1
DESIGN FACTORS. This chapter contains criteria and information on
flooding of drydocks, particularly methods of flooding and the design of hydraulic
structures.
6-1.1
Requirements. Flooding of drydocks is done entirely by gravity;
superflooding feature installations require a pumping system to raise the inside water
levels to higher elevations. Design and arrange all flooding systems to operate with a
minimum of disturbance to ship blocking, no intake of silt or floating objects, a minimum
of required special gate control, and no vacuum or cavitation effects in the water
channels. Gates and gate operating mechanisms must be reliable and durable.
6-1.2
Flooding Periods. Subject to some variations resulting from peculiarities
of a given flooding system, the times for flooding the docks should be, for the main
classifications:
Submarine and destroyer docks, 45 minutes.
Cruiser docks, 60 minutes.
Carrier and Auxiliary docks, 90 minutes.
6-2
FLOODING METHODS. There are three general methods used for
admitting water into drydock chambers:
from flooding intakes on one or both sides of the entrance through culverts
built into the lower parts of sidewalls and connected to floor openings
spaced along a dock length,
from flooding intakes on one or both sides of the entrance through culverts
passing transversely under the floor near the entrance with openings
leading upward into the floor, or
through ducts in an entrance closure caisson or gate.
Either of the first two systems may be built into both sides of docks. They
have several features in common at intake portions.
6-2.1
Common Intake Features. Except under special conditions, place one
intake opening on each side of an entrance. For very large docks requiring large
culverts, two openings on each side may be used to reduce sluice gate sizes.
6-2.1.1
Opening Edges. Opening edges should be rounded to reduce eddying
and contraction of the stream.
6-1
Previous Page
