Water Distribution Operator Class I study plan

Classify the common distribution pipe materials - ductile iron, PVC, HDPE, steel, cast iron, and asbestos-cement - by pressure class, joint type, and typical service application, writing the comparison from memory.

Identify the function and correct location of gate, butterfly, check, pressure-reducing, pressure-relief, and air-release/air-vacuum valves in a distribution system.

Sketch grid, loop, and tree layouts and label each layout's advantages and drawbacks for fire flow, redundancy, and water age.

State typical design criteria for minimum main size, hydrant spacing, valve spacing, and cover over bury, and explain why each value exists.

Sequence a main installation from trench excavation and bedding through pipe laying, joint assembly, thrust restraint, and pressure/leak testing.

Explain thrust blocks and restrained joints at bends, tees, reducers, and dead ends, and identify where each method is required.

Write out the full procedure for a main break repair: isolation, customer notification, excavation, cut-out, clamp or coupling installation, disinfection, flushing, and site restoration.

Describe a valve-exercising and hydrant-maintenance program, including recommended frequency, common failure modes, and the records kept.

Diagnose typical field problems - joint leaks, tuberculation, corrosion, and water hammer - and match each to a corrective maintenance action.

Calculate chlorine dose, demand, and residual using the C times V relationship, and convert between pounds per day and milligrams per liter feed rates.

Distinguish free chlorine from total chlorine, and describe how disinfection byproducts, nitrification, and TTHM/HAA5 monitoring thresholds drive operational decisions.

Explain main disinfection after new construction or repair: swabbing, target concentration, required contact time, residual verification, and dechlorination before discharge.

Select bacteriological sampling sites and state holding time, preservation, and handling requirements, then interpret positive coliform and chlorine residual results.

Design a unidirectional flushing sequence by identifying valve closures, target velocity, and flush duration for a given main segment.

Convert between pressure in psi and head in feet, and compute static, residual, and operating pressure at a point from elevation differences.

Read a pump curve against a system curve, identify the operating point, and explain cavitation, NPSH, and the affinity laws in plain language.

Describe storage tank types and functions - equalization, fire storage, and emergency reserve - and explain how tank level and altitude valves set system pressure.

Solve flow and pressure problems using Q equals A times V, continuity, and C-factor friction loss concepts, carrying units correctly through each step.

Define cross-connection, backpressure, and backsiphonage, and classify a described condition as high hazard or low hazard.

Select the appropriate protection - air gap, RPZ, double check valve, pressure vacuum breaker, or atmospheric vacuum breaker - for six given field scenarios and justify each choice.

Explain the elements of a cross-connection control program: facility surveys, device inventory, annual testing, tester certification, and record retention.

State installation requirements for air gaps and reduced-pressure principle assemblies, including minimum clearance and no-bypass rules.

Connect cross-connection failures to distribution water quality outcomes and describe the containment steps taken after a suspected backflow incident.

Compare groundwater and surface water sources by withdrawal method, treatment implications, and typical distribution pressure and quality issues.

Explain wellhead protection, sanitary survey findings, and source water monitoring requirements that affect the distribution operator.

Trace water from source through treatment, storage, and distribution, and identify where water age and chlorine decay accumulate in each layout type.

Compute storage volume, demand, and peaking factors to determine whether supply meets average-day and maximum-day needs.

Apply confined-space entry rules, excavation and shoring requirements, and traffic control setup to described distribution job sites.

Describe safe handling, storage, and emergency response for chlorine and other distribution chemicals, including spill and exposure first aid steps.

Outline the components of an emergency response plan and a system security assessment, and practice the decision sequence for a main break, boil-water notice, or contamination event.

Identify the reporting, public notification, monitoring, and recordkeeping obligations that fall on the distribution operator, including sample results, maintenance logs, and certification renewal.

Consolidate every formula used in the previous seven weeks onto a single sheet and solve one fresh problem per formula without notes.

Complete a timed 100-question cumulative practice exam and log every missed item by domain.

Re-study the two lowest-scoring domains from the practice exam and rewrite the underlying rule or formula for each missed item in your own words.

Rehearse the pre-test checklist: exam-day math conventions, unit traps, and the certification and continuing-education requirements you must maintain.