its notices to mariners. We will, therefore, enter judgment in favor of the government.
FINDINGS OF FACT
1. Jurisdiction over the parties and the subject matter herein is conferred upon this court pursuant to the Suits in Admiralty Act, 46 U.S.C. §§ 741 to 752 (1970).
2. The River and Harbor Act of September 3, 1954 (P.L. 780, September 3, 1954, Ch. 1264, Title I, 68 Stat. 1248) authorized the deepening and widening of the channel in the Delaware River from the Navy Yard to Allegheny Avenue, Philadelphia, and to the upstream end of Newbold Island. The channel was to be deepened to a depth of 40 feet and widened to a width of 1000 feet.
3. The channel in the Delaware River is now 1000 feet wide. At Pier 77N the 1000 foot channel's westerly edge is 50 feet from the pier. The 40 foot project depth is the westerly 400 feet of the channel. The remaining 600 feet is a project depth of 37 feet. For purposes of surveying, the channel is also divided into 1000 feet stations from North to South of the river. The zero point of the stationing is at a point opposite Allegheny Avenue. A reference to 7 plus 000, or 7000, indicates the point 7000 feet below Allegheny Avenue. Pier 77N is at station 7퍍. (N.T. 4-101)
4. Reach D is an area of the Delaware River north of the Benjamin Franklin Bridge approximately between Pier 61 to the downstream of the river and Pier A at Port Richmond to the upstream of the river. (N.T. 414; Pl.Ex.42)
5. On channel depth statements issued by the government the area of Reach D where the Ore Chief is claimed by plaintiff to have grounded is referred to as the Philadelphia-Camden Bridge to Cumberland Street, Philadelphia area. (N.T. 4-81; Pl.Ex.37)
6. Dredging for the purpose of deepening the channel to 40 feet for a width of 400 feet in the area known as Reach D above the Benjamin Franklin Bridge was completed in April of 1960. (N.T. 4-76)
7. The dredging operation was performed pursuant to a bid contract with the American Dredging Company. (N.T. 4-76) During the period relevant to this action, the Army Corps of Engineers' practice was to survey the areas dredged after the dredging company had certified completion of the contract requirements. (N.T. 4-99, 4-103)
8. There are generally four methods of conducting surveys of the depth of a river. One method is by means of electronic depth recorders. (N.T. 4-88) The recorders transmit an electronic impulse to the bottom of the river which bounces off the bottom and comes back up. (N.T. 4-89) It is estimated that a recording will cover a floor area of the river to a width of 15 to 20 feet. (N.T. 92g)
9. Another method of surveying is the sweep bar method. Sweep surveys are conducted by suspending a bar on a pipe at a known depth and drifting with the current perpendicularly to the longitudinal axis of the channel and in this way determining that a particular area is clear to a certain depth. If the suspended bar hits something, there obviously exists a spot shallower than the depth at which the bar is suspended. (N.T. 4-94)
10. At the time pertinent to this case the bar used for the surveys had a width of 110 feet. Thus, the area swept at any one time was 110 feet. (N.T. 4-95)
11. The accuracy of the results obtained with the sounding method is comparable to the accuracy of the results obtained with the sweep method. (N.T. 4-97)
12. Another method used in surveying is the wire drag survey. In a wire drag a wire is suspended from floats at a predetermined depth and dragged by two vessels. The wire drag is used to discover if there are any large obstructions. It is used to cover a very large area of from 3000 to 4000 feet. The wire drag method was not used by the Army Corps of Engineers in the 40 foot project depth surveys. (N.T. 4-98)
13. Yet another method of surveying is by lead line soundings. This method involves putting a weight on the end of a line and dropping it until it hits something. A measurement of the line is then taken. Lead line soundings are done at 10 foot intervals. (N.T. 4-108)
14. Upon completion of the 40 foot project depth in April 1960, the government surveyed by sweep bar method the entire area in Reach D. (N.T. 4-99)
15. Although the project depth was required to be cleared only to 40 feet, the government cleared the depth to 42 feet. The additional two feet assures a clear project channel and eliminates the necessity of dredging in the immediate future to remove recently accumulated material. (N.T. 4-106)
16. On at least six occasions sweeps were made of the project area in the station off Pier 77N. (N.T. 4-100 to 4-118; Pl.Ex. 47 to 47e) On each occasion some four sweeps were made, (N.T. 4-118) with an overlap in the sweep of an area of 10 to 20 feet.
17. After completion of the project depth in April 1960 until the Ore Chief grounding on January 3, 1965, no other bar sweeps of the entire 400 foot channel off Pier 77N were made. (N.T. 4-124)
18. For purposes other than dredging a sweep bar survey is impractical; electronic soundings are more than adequate. (N.T.6-8, 9 and 54) Because of tide conditions sweep surveys cannot be used as frequently as soundings. (N.T. 6-13)
19. Two bar sweeps were made on January 5 and 9, 1965. The area was swept to 40 feet in Reach D. The entire area was found to be clear to 40 feet. (N.T. 135-36) (Pl.Ex. 14A which is also numbered 15)
20. Sounding surveys were made in October 1961 (Pl.Ex.52), November 1962 (Pl.Ex. 51), August 1963 (Pl.Ex. 50), and November 1964 (Pl.Ex. 12).
21. The results of these soundings were as follows:
REFERENCES ARE TO THE 40' X 400' CHANNEL*
West 100' E. East
Sta. Edge of W.L. 100'E. Edge
3 Nov. '64 7퍍 41.9 43.3 44.0 43.2 45.1
30 Aug. '63 6 41.0 44.0 44.1 46.0 43.0
1 Nov. '62 6 42.8 45.5 45.9 44.5 44.7
20 Oct. '61 7ퟍ 42.0 45.7 44.8 46.5 33.0
6 40.8 42.5 42.4 41.7 39.2
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