Flumes offer distinct advantages over sharp-crested weirs: 1  For the same control width, the head loss for a flume is about one-fourth of that needed to operate a sharp-crested weir. 2  The velocity of approach is part of the calibration equations for flumes.
How long does alcohol stay in your system saliva tests - How long does alcohol stay in my system for a saliva test? Depends. Alcohol has an approximate detection time of 12-24 hrs, The detection time depends on the maximum level of blood alcohol content (BAC) which can vary. One serving of alcohol can be fully absorbed in the blood stream 30 min up to 2 hrs after intake. The body metabolizes aprox 0.25 oz per hour.
The important thing to realize is that in saliva, marijuana has a shorter window of detection than other drugs tested for by this product. Marijuana can be detected by a saliva drug test at 97-98% accuracy between 1 and 12 hours after use.Other drugs stay in saliva longer at that extremely high accuracy level (97-99%) , marijuana does not. So this is a perfect test for detecting extremely recent use or if someone is still high on marijuana.arijuana can be detected by a saliva drug test at 97-98% accuracy between 1 and 12 hours after use. Other drugs stay in saliva longer at that extremely high accuracy level (97-99%) , marijuana does not.