Section 6 

 POETSMOUTH, NEW HAMPSHIRE -- POETSMOUTH NAVAL SIPYAED 



A6.01 Location of the Test Station and Test Board 



Two panel-type test beards (USNKH-l and USNNH-2) were installed 

 at the Portsmouth Naval Shipyard, Portsmouth, New Hampshire, on June 

 12 and 1^, 19'<-'*, the first on the outboard end of the Topeka Pier 

 between berths 15 and l6, and the second on the southerly side of 

 the fitting -out pier at the western end of berth 11 It was later 

 reported that the second board had been pulled up and found floating 

 away. It was rehung on the Inboard end of berth 11 early in August 

 19kk. Results from these test boards, still in operation, have been 

 summarized through 19^7. 



A6 . 02 Hydrographic Data 



1. Test Board No. 1 . The water depth at this installation 

 was 25 ft; the average tidal range was 8 ft; the velocity of the 

 current was estimated at 2 knots. The maximum summer water temperature 

 was reported 70° F to 72° F, and the minimum winter tejnperature 



26° F to 27° F. The water salinity appeared to be practically that 

 of the ocean, and the degree of pullution was reported to be slight, 

 if any. 



2. Test Board No. 2 . Here the water depth was 20 ft; the 

 average tidal rsmge, 8 ft; the estimated current velocity, 5 knots. 

 Teii5)erature, salinity, and pollution data are as given for Test 

 Board No. 1. 



A6.05 Marine Borers 



1. Teredlnidae . No evidence of Teredinidae was recorded in 

 the control panels at either location and only slight attacks in the 

 test panels. Teredo navalis was the only form identified. At 

 location No. 1, no borers were recorded in 19'*^ and 19^5; "the attack 

 rated but a trace in 19^6 and flight in 19^7. The maximum length 



of specimens was 58 mm. At location No. 2, no Teredinidae were 

 recorded in 19'+^; the attack rated a trace in 19'<-5 and slight 

 in 19^6 and 19^7. The maximum length attained by specimens was k^ ram. 

 There was no evidence of breeding before May 1. 



2. Llmnorla . Llmnoria were present in small numbers in the 

 control panels at both locations but occurred only in those panels 

 exposed during the months from March through October. In the test 

 panels, Llmnorla were present practically throughout the period 

 covered by the test at each location, the attacks mostly rating 



3h 



