Distribution Hydraulics and Storage Questions

Distribution System Design and Hydraulics is 20 questions on the California D1 and D2 exams. Practice pressure, flow and storage.

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100 questions in the official content counts, with a score for every area and an explanation for every option.

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  • 23 original hydraulics questions, every option explained
  • Tested on 10 of our 25 practice exams
Free sample · Question 1 of 3Hydraulics

Many state rules require distribution systems to keep a minimum pressure during fire flow. Which value is commonly used?

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What our hydraulics questions cover

  • Feet of head and psi, static and dynamic pressure, hydraulic grade line
  • Velocity, head loss, C-factor and looped mains
  • Water hammer, cavitation and surge control
  • Pressure zones, booster stations, elevated and hydropneumatic storage
  • Demand patterns, water age and SCADA monitoring
Line drawing of an elevated water tank feeding a neighborhood below, a booster pump station on a hill and a pressure gauge with a blank dial on a pipe

This list is our own summary, written for practice. The exam owners publish their outlines: California’s Expected Range of Knowledge, TCEQ’s Need-to-Know Criteria and WPI’s Need-to-Know Criteria.

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Take the California D2 practice exam

100 questions in the official content counts, with a score for every area and an explanation for every option.

Or try the free hydraulics drill

Ideas the questions test most

  1. 1 ft of water = 0.433 psi; 1 psi = 2.31 ft.
  2. Many state rules keep at least 20 psi during fire flow.
  3. Head loss rises with velocity, length and roughness.
  4. Cycle storage tanks to limit water age.

Start the free hydraulics drill · California D2 practice test · California D1 practice test · California D3 practice test · California D4 practice test · TCEQ Class D Water practice test · TCEQ Class C Distribution practice test

Common questions

What causes water hammer?

A sudden change in flow, such as a valve closed too quickly or a pump that stops suddenly. The moving water’s momentum becomes a pressure wave.

Why do storage tanks need turnover?

Stored water ages, loses its disinfectant residual and keeps forming byproducts. Cycling the level exchanges it while keeping fire and emergency reserve.

Take the California D2 practice exam

100 questions in the official content counts, with a score for every area and an explanation for every option.

Or try the free hydraulics drill

More operator topics

Outlines used for these questions: Expected Range of Knowledge, Drinking Water Treatment Exam (rev. 4/2020, PDF) · Expected Range of Knowledge, Drinking Water Distribution Exam (rev. 4/2020, PDF) · TCEQ: Need-to-Know Criteria for public water system operators · TCEQ: What applicants for wastewater licenses need to know · WPI: 2025 Need-to-Know Criteria.

Game Assessment Prep is an independent practice site, not affiliated with or endorsed by Water Professionals International (WPI, formerly ABC), the California State Water Resources Control Board or the Texas Commission on Environmental Quality. Every question is original; none is taken from a certification exam, an official study guide or another prep provider.