b. Personnel DZs located at compara

b. Personnel DZs located at comparatively high elevations (6,000 feet (1,640 meters) or higher) should, where possible, utilize soft snow or grasslands, due to the increased rate of parachute descent. c. Swamps and low marshy ground, normally less desirable in the summer, and paddy fields when dry often make good drop zones. d. Personnel and cargo can be received on water DZs. 1. Minimum depths for reception of personnel is 4 feet and arrangements must be made for rapid pickup. 2. The surface of the water must be clear of floating debris or moored craft, and there should be no protruding boulders, ledges, or pilings. 3. The water must also be clear of underwater obstructions to a depth of 4 feet. 4. Water reception points should not be near shallows or where currents are swift. 5. Minimum safe water temperature is 50°F. (10°C.)