meters installed in the inflow lines. Baffles and a fiber mat floating on the 

 water surface at the tank entrance were used to smooth and steady the flow. 



32. For the hydraulic efficiency tests, a 10-m length of plastic grass 

 mat carpet approximately 1.3 cm in height was glued to the floor of the tank 

 to create a uniform roughness. The plastic grass mat carpet was emplaced to 

 extend beyond both sides of the center portion of the flume with plexiglass 

 walls which served as the testing area. Section A (Figure 9), located at the 

 upflow side of the plexiglass panel approximately 7.6m from the water inflow, 

 was used as a control area for measuring vertical profiles of flow speed. 

 Section B, located near the end of the plexiglass panel and 12.2 m from the 

 water inflow, was used as the test section. Section B was chosen such that 

 flow at the trap nozzles would not be influenced by the ripples from panel 

 seams during testing. 



-SECTION B 

 (TEST SECTION) 



SECTION A 

 {CONTROL SECTION) 



Figure 9. Locations of testing and control sections for hydraulic test 



23 



