-24 



24 



T 



12 T 



1 







7 





SAMPLE AREA 

 ^©ANCHORS (^=3=> CORNERS 



STREAM FLOW 



TILT ANCHORS SO A PROJECTED 



/,\ LINE FROM THEM MEETS OVER 

 / | \ THE CENTER 



/ I \ 



Figure 10. --Drawing of 

 anchor location. 



Water Flow Shield, Lifting Hoist, and Instrumentation 



The water flow shield was placed around the probes to stop surface water circulation 

 (fig. 11). Leaks into the sample area were indicated by water currents near the inside 

 edge of the shield. A canvas was used to cover the upstream side of the shield for a 

 tighter seal. The lifting hoist was then placed over the sample area. 



The C0 2 distribution manifold was connected to the probes and then to the C0 2 

 tanks. CO2 was turned into each row of probes and leaks were located by looking for 

 bubbles in the water around the probes. If leaks were found, the leaking probe was 

 replaced. Small leaks will not cause the test to fail, but it slows ice formation 

 around the probe. 



The thermocouple meter was wrapped in a plastic bag to protect it from water. 

 The thermocouple switch can be taped to the lifting frame near the throttle valves for 

 easy access. The four downstream probe thermocouple probes were inserted in the stream- 

 bed in one of the larger spaces between the probes and connected to the thermocouple 



13 



