Chapter 7 Flashcards
The Rio Grande River is the longest river in Texas, stretching _____miles along the Mexico Border
1250
_______reservoir is the largest lake entirely within Texas
Sam Rayburn
Raw water intakes must not be located within _______feet of boat ramps, marinas, docks or fishing piers
1,000
A restricted zone of ______feet radius from the raw water intake must be established and recreational activities and trespassing shall be prohibited
200
Surface water is usually low in _____and ______
Minerals / Gases
Bacteria, algae, and turbidity can be a problem in surface water as well as municipal, industrial and agricultural pollution. ( true or false )
True
TCEQ defines ( COMPLETE TREATMENT ) as the following sequence of processes : pretreatment disinfection, taste and odor control, continuous coagulation , sedimentation , filtration , terminal disinfection, and covered storage ( true and false )
True
Destratification is the mixing of lake water by compressed air to prevent layers of different _______ from developing
Temperature
The primary goal of coagulation , sedimentation and filtration is to remove _________
Turbidity
Turbidity can shelter bacteria from the disinfection process ( true or false)
True
The two pathogenic protozoans resistant to chlorination are _______ and _______
Giardia / Cryptosporidium
Coagulation works by the bonding of negatively charged turbidity to positively charged chemical coagulants
True
Chemical dosage, water temperature , PH, _______, and the characteristics of the raw water all have an affect on the coagulation process
Mixing
Operators run jar tests to select the most effective coagulant and dosage ( true or false)
True
The process of separating floc from water by gravity is ___________
Sedimentation
Filtration is the ______step in the removal of suspended solids
Last
Filtration is the last barrier between the public and _______or________
Giardia / cryptosporidium
TCEQ requires filtered water to be 0.3 NTUs or less in at least 95% of measurements each month ( true or false ) .3 NTUS of Turbidity
True
Filter problems include air binding , mud balls , media cracks, and media loss. ( true or false)
True
If the media collects in the wash water troughs, the wash rate is to high ( true or false )
True
All public water systems on texas are required are required to use _____as the final disinfectant
Chlorine
Treated water is stored at the plant in a tank called a clear well ( true or false)
True
