TCEQ Class B Surface Water Exam 2026
| NEWEST Test Material |100% Verified
Questions & Detailed Ans
EXAM
.
1. What is the formula for the area of a circle?
o Answer: 0.785×D20.785×D2 or πr2πr2.
o Rationale: Used for pipe flow and tank surface area.
2. How do you calculate Detention Time?
o Answer: DT=Volume (gal)Flow (gpm or gpd)DT=Flow (gpm or gpd)Volume (gal).
o Rationale: Must ensure units match (e.g., convert MG to gallons).
3. A plant treats 2.0 MGD. What is the flow in GPM?
o Answer: 2,000,000÷1440=1,3892,000,000÷1440=1,389 GPM.
4. Calculate Surface Overflow Rate (SOR).
o Answer: SOR=Flow (gpd)Surface Area (ft²)SOR=Surface Area (ft²)Flow (gpd).
5. What is the Weir Overflow Rate formula?
o Answer: WOR=Flow (gpd)Weir Length (ft)WOR=Weir Length (ft)Flow (gpd).
6. Convert 50 psi to feet of head.
o Answer: 50×2.31=115.550×2.31=115.5 feet.
7. What is the horsepower formula for a pump?
o Answer: WHP=Flow (gpm)×Head (ft)3960WHP=3960Flow (gpm)×Head (ft)
; BHP=WHPMotor EfficiencyBHP=Motor EfficiencyWHP.
8. How do you calculate chemical dose (lbs/day)?
, o Answer: Lbs/day=Dose (mg/L)×Flow (MGD)×8.34Lbs/day=Dose (mg/L)×
Flow (MGD)×8.34.
9. How do you calculate chemical dose (lbs) for a batch?
o Answer: Lbs=Dose (mg/L)×Volume (MG)×8.34Lbs=Dose (mg/L)×Volum
e (MG)×8.34.
10. What is the "Percent Strength" of a solution?
o Answer: Pounds of ChemicalPounds of Water×100Pounds of WaterPounds of Chemic
al×100.
🧪 Coagulation, Flocculation & Sedimentation
11. What is the purpose of Coagulation?
o Answer: To destabilize colloidal particles so they can stick together.
12. What is the purpose of Flocculation?
o Answer: To gently mix water to promote particle collisions to form larger floc.
13. What is the most common coagulant?
o Answer: Alum (Aluminum Sulfate).
14. What is "Floc Carryover"?
o Answer: Floc escaping the sedimentation basin into the filters. Usually caused by
overloading or temperature changes.
15. What is a "Jar Test"?
o Answer: A lab procedure to determine the optimal coagulant dose and pH for
coagulation.
16. What is the target velocity for flocculation?
o Answer: Low velocity (1-2 fps) to prevent shearing the floc.
17. What is a "Flume"?
o Answer: A channel that carries water; often used with a Parshall flume to measure
flow.
| NEWEST Test Material |100% Verified
Questions & Detailed Ans
EXAM
.
1. What is the formula for the area of a circle?
o Answer: 0.785×D20.785×D2 or πr2πr2.
o Rationale: Used for pipe flow and tank surface area.
2. How do you calculate Detention Time?
o Answer: DT=Volume (gal)Flow (gpm or gpd)DT=Flow (gpm or gpd)Volume (gal).
o Rationale: Must ensure units match (e.g., convert MG to gallons).
3. A plant treats 2.0 MGD. What is the flow in GPM?
o Answer: 2,000,000÷1440=1,3892,000,000÷1440=1,389 GPM.
4. Calculate Surface Overflow Rate (SOR).
o Answer: SOR=Flow (gpd)Surface Area (ft²)SOR=Surface Area (ft²)Flow (gpd).
5. What is the Weir Overflow Rate formula?
o Answer: WOR=Flow (gpd)Weir Length (ft)WOR=Weir Length (ft)Flow (gpd).
6. Convert 50 psi to feet of head.
o Answer: 50×2.31=115.550×2.31=115.5 feet.
7. What is the horsepower formula for a pump?
o Answer: WHP=Flow (gpm)×Head (ft)3960WHP=3960Flow (gpm)×Head (ft)
; BHP=WHPMotor EfficiencyBHP=Motor EfficiencyWHP.
8. How do you calculate chemical dose (lbs/day)?
, o Answer: Lbs/day=Dose (mg/L)×Flow (MGD)×8.34Lbs/day=Dose (mg/L)×
Flow (MGD)×8.34.
9. How do you calculate chemical dose (lbs) for a batch?
o Answer: Lbs=Dose (mg/L)×Volume (MG)×8.34Lbs=Dose (mg/L)×Volum
e (MG)×8.34.
10. What is the "Percent Strength" of a solution?
o Answer: Pounds of ChemicalPounds of Water×100Pounds of WaterPounds of Chemic
al×100.
🧪 Coagulation, Flocculation & Sedimentation
11. What is the purpose of Coagulation?
o Answer: To destabilize colloidal particles so they can stick together.
12. What is the purpose of Flocculation?
o Answer: To gently mix water to promote particle collisions to form larger floc.
13. What is the most common coagulant?
o Answer: Alum (Aluminum Sulfate).
14. What is "Floc Carryover"?
o Answer: Floc escaping the sedimentation basin into the filters. Usually caused by
overloading or temperature changes.
15. What is a "Jar Test"?
o Answer: A lab procedure to determine the optimal coagulant dose and pH for
coagulation.
16. What is the target velocity for flocculation?
o Answer: Low velocity (1-2 fps) to prevent shearing the floc.
17. What is a "Flume"?
o Answer: A channel that carries water; often used with a Parshall flume to measure
flow.
