MIL-HDBK-1025/5
Space Requirements
2.1.2
Berthing Basins. For safe maneuvering and navigation of craft,
2.1.2.1
good basin geometry considers adequate clearances for three different classes
and for three positions or operations of boats. The three positions or
operations of boats are clearances in slips beyond the beam and length of the
craft, width of entrance and exit channels, and depth and width of water area
for maneuvering to and from slips, that is, the turning basin. The average
harbor with all-ship moorage can berth from 15 to 20 boats per acre
(equivalent to about 200 m per boat) of navigable water area, including main
interior channel, fairways, and slip areas, but not the entrance channel.
This general rule shall apply only for an average boat length of 30 to
35 ft (9.1 - 10.6 m) and where good basin geometry can be obtained. Figure 1
represents a typical layout of a small craft harbor and associated berthing
facilities.
Land Area. The size of land areas is generally about 80 percent of
2.1.2.2
the water area or about 160 m2 per boat.
Finger Width. Because wider fingers are needed for two-boat ships,
2.1.2.3
they will occupy about the same area as that required for single-boat slips.
Water Area. When bow-and-stern moorings are used in lieu of slips,
2.1.2.4
about 2 to 4 times as much water area (depending on the water depth) is
required, exclusive of fairways and channels. Single-point moorings require
about 6 times the area occupied by the same number of bow-and-stern moorings
if full-circle clearance is provided.
Launching Ramp or Hoist. An average launching ramp or hoist will
2.1.2.5
launch and retrieve about 50 trailered boats on a peak traffic day.
Parking Lot. For the normal distribution of small boats, a minimum
2.1.2.6
of three vehicle spaces in the parking lot will be required for every four
boats in the berthing area.
Harbor Service Facilities. Minimum land area required for harbor
2.1.2.7
service facilities, ancillary facilities, and roads and hardstands is an area
approximately equal to the parking area required for berths and operational
launchings.
Berthing Basin Depths
2.1.3
Criteria.
The interior basin depth requirements for small craft
2.1.3.1
berthing shall be determined from DM-26.1, Harbors, and also by reckoning the
effect of bottom depth on structures of the berthing system, such as fixed-
pier supports, floating pier guide piles and dolphins, and interior wave and
surge baffles.
Minimum Depths. Assuming that the maximum depression of a boat
2.1.3.2
below the still-water surf will be about 2 ft (.61 m) (due to wave action
and scend), the depth shall be at least 2 feet below the keel of the deepest-
draft boat at extreme low water.
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