Distinguish inflow from infiltration in a collection system.

• A. Inflow is wastewater entering the system from customer sewers; infiltration is groundwater entering through cracks or joints; both increase flows
• B. Inflow is groundwater entering through cracks; infiltration is wastewater from customers
• C. Inflow is wastewater only during storms; infiltration is unrelated
• D. Inflow and infiltration are the same

Answer: (A)