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PE Civil: Water Resources and Environmental

Closed-conduit and open-channel hydraulics, hydrology, groundwater, and water/wastewater treatment.

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Straight from the PE Civil: Water Resources and Environmental bank — 1,700+ questions, every one with a full worked solution.

medium
A. Storms, IDF, time of concentration & runoff
A commercial parking catchment of A=12 acresA=12\,\text{acres} has a runoff coefficient C=0.65C=0.65 and a time of concentration Tc=18 minT_c=18\,\text{min}. The local 10-yr IDF curve is fitted as i=a/(td+b)ci=a/(t_d+b)^c with a=64.1a=64.1, b=11b=11, c=0.81c=0.81 (tdt_d in minutes, ii in in/hr). The 10-yr peak discharge from the catchment (cfs) is most nearly:
Figure for this questionduration td (min)i (in/hr)5-yr10-yr design stormtd = Tc

Figure — drag or pinch to move around

  • 14.8 cfs
  • 15.8 cfs
  • 23.4 cfs
  • 32.7 cfs (correct answer)

Worked solution

Rational method (PE Civil Reference Handbook §6.5.2.1): the design intensity is read from the IDF curve at a duration equal to the time of concentration, i=64.1(18+11)0.81=4.19i=\dfrac{64.1}{(18+11)^{0.81}}=4.19 in/hr at td=Tc=18t_d=T_c=18 min. Then Q=C i A=0.65(4.19)(12)=32.7Q=C\,i\,A=0.65(4.19)(12)=32.7 cfs, taking 1 acre-in./hr as 1.0 cfs as the handbook does. Distractors: applied the exponent to TcT_c alone, as the handbook's §6.5.3.1 equations do, i=a/(Tc c+b)=3.00i=a/(T_c^{\,c}+b)=3.00 in/hr and Q=23.4Q=23.4 cfs; divided first and raised the whole quotient to the power, i=(a/(Tc+b))c=1.90i=\left(a/(T_c+b)\right)^{c}=1.90 in/hr and Q=14.8Q=14.8 cfs; and read the curve at the 1-hr storm (td=60t_d=60 min) instead of at TcT_c, i=2.03i=2.03 in/hr and Q=15.8Q=15.8 cfs.

Difficulty mix

How this bank splits by our own difficulty rating, from quick wins to multi-step problems.

  • Easy14%
  • Medium50%
  • Hard36%

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66 concepts — worked theory, key equations, and common pitfalls for every topic.

Sample concept

Present Worth and Comparing Alternatives

Use time-value-of-money factors to compare alternatives by present worth, equivalent uniform annual cost, rate of return, benefit-cost ratio, payback, life-cycle cost, and the triple bottom line.

Every infrastructure decision is a money-over-time decision: a pump that costs more today but less to run, a pipe material that lasts twice as long, a green-infrastructure retrofit that pays back in avoided fees. Engineering economics is the language for comparing those alternatives on equal footing…
F=P(1+i)n,P=F(1+i)−nF = P(1+i)^n, \qquad P = F(1+i)^{-n}
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The PE Civil: Water Resources and Environmental exam at a glance

Sourced from NCEES — the numbers, not the folklore.

Questions
80
scored and pretest, one sitting
Exam time
8h
in a 9h appointment · about 6 min per question
First-time pass rate
71%
50% for repeat takers · NCEES Squared 2025 (FY2024-25)
NCEES fee
$400
per attempt, paid to NCEES; your state board's fees are separate
Retakes
3 per 12 months
at most one attempt per testing window
Reference on screen
PE Civil Reference Handbook + Ten States Standards (Wastewater Facilities 2014, Water Works 2018), for exams through March 2027
closed book: no notes or references of your own

What NCEES says is on it

Every knowledge area in the official PE Civil: Water Resources and Environmental specification, with the number of questions NCEES says each one gets. The five heaviest are about 54% of the exam. Share is our arithmetic, not an NCEES figure: each range's midpoint as a percentage of all the midpoints.

Knowledge areaQuestionsShare
Project Sitework9–1413%
Hydrology8–1211%
Hydraulics—Closed Conduit7–1110%
Hydraulics—Open Channel7–1110%
Wastewater Collection and Treatment7–1110%
Analysis and Design6–98%
Drinking Water Distribution and Treatment6–98%
Surface Water and Groundwater Quality5–87%
Groundwater and Wells4–66%
Materials4–66%
Project Planning4–66%
Soil Mechanics3–54%

Sources: NCEES PE Civil: Water Resources and Environmental exam specification (April 2024) · pass rate: NCEES Squared 2025 (FY2024-25) · fee and retake policy: ncees.org, read 2026-09-15. Your state board sets its own fees and deadlines.

How to prepare for PE Civil — WRE

Four steps, in the order that pays off — each one built from this exam's own blueprint.

  1. 1

    Study to the blueprint, not the textbook

    Project Sitework, Hydrology, Hydraulics—Closed Conduit, Hydraulics—Open Channel, and Wastewater Collection and Treatment are about 54% of the exam. Give them that share of your hours — Soil Mechanics is only 3–5 questions.

    See every area's question range
  2. 2

    Practice one area at a time, then mix

    Work a knowledge area until its worked solutions stop surprising you, then switch to mixed sets so recognizing the problem type becomes the skill.

    Practice PE Civil — WRE questions
  3. 3

    Sit timed mock exams at the real pace

    The real exam gives you about 6 minutes per question. Full-length timed mocks are the only way to find out whether you can hold that pace for 8h.

    Take a mock exam (with a pass)
  4. 4

    Read what the exam actually asks

    Its largest knowledge area is Project Sitework, not hydraulics. By the NCEES specification's own ranges, 20 to 30 of the 80 questions are not water engineering at all.

    The PE Civil Water Resources and Environmental exam

Questions, answered

How hard is the PE Civil: Water Resources and Environmental exam?

NCEES reports a 71% pass rate for first-time takers of PE Civil: Water Resources and Environmental and 50% for repeat takers in NCEES Squared 2025 (FY2024-25). It is 80 questions in 8h, about 6 minutes per question, so pacing matters as much as knowledge. The heaviest areas are Project Sitework, Hydrology, Hydraulics—Closed Conduit, Hydraulics—Open Channel, and Wastewater Collection and Treatment.

What topics are on the PE Civil: Water Resources and Environmental exam?

NCEES's PE Civil: Water Resources and Environmental specification lists 12 knowledge areas with a question range for each. The heaviest are Project Sitework (9–14 questions), Hydrology (8–12 questions), Hydraulics—Closed Conduit (7–11 questions), Hydraulics—Open Channel (7–11 questions), and Wastewater Collection and Treatment (7–11 questions) — together about 54% of the exam. The full list is in the exam-at-a-glance table on this page.

How long is the PE Civil: Water Resources and Environmental exam?

The PE Civil: Water Resources and Environmental exam is 80 questions in 8h of exam time, inside a 9h appointment that also covers the nondisclosure agreement, the tutorial and a scheduled break. It is a closed-book, computer-based test offered year-round at Pearson VUE test centers.

What reference material do you get on PE Civil: Water Resources and Environmental exam day?

The PE Civil: Water Resources and Environmental exam is closed book. NCEES provides an electronic reference on screen (PE Civil Reference Handbook + Ten States Standards (Wastewater Facilities 2014, Water Works 2018), for exams through March 2027). NCEES has posted updated design standards for exams from April 2027. No notes, books or references of your own come into the room; you may bring one NCEES-approved calculator, and an on-screen TI-30XS calculator is also available during the exam. Practicing with that same reference in front of you, so you already know where each method lives, is half the preparation.

How much does the PE Civil: Water Resources and Environmental exam cost, and can you retake it?

The NCEES fee for the PE Civil: Water Resources and Environmental exam is $400, paid per attempt when you register through your MyNCEES account; some state licensing boards also charge their own application fee. NCEES allows one attempt per testing window and no more than three attempts in a 12-month period.

What do I get with PE Civil: Water Resources and Environmental on FE → PE Prep?

1,700+ PE Civil: Water Resources and Environmental practice questions, every one with a step-by-step worked solution; unlimited full-length timed mock exams weighted to the NCEES blueprint; a 66-concept study handbook, 590+ flashcards, and an AI tutor. Access is a one-time pass for 1, 3, 6 or 12 months — no subscription, no auto-renew — and the free sample questions need no account. Within 7 days, with little or no paid content used, you can ask for a refund, which we consider under the Refund Policy.

Can you help with the PE experience requirement?

Yes — a built-in PE Experience Tracker helps you record and organize the qualifying engineering experience and references your state board needs for licensure, right alongside your exam prep.

Free reading for PE Civil — WRE

No account needed — pass rates, worked problems, and what the exam actually asks.

Free PE Civil — WRE practice problemsReal questions from the bank, with the figures and full worked solutions.Free PE Civil — WRE formula sheet115 key equations by exam topic, each with what it is for and its handbook reference.How hard is the PE Civil exam? Structural vs Transportation vs Water ResourcesNCEES's own pass rates for all five PE Civil depths, what each specification actually weights, and how to pick your depth from the numbers rather than the folklore.The PE Civil Water Resources and Environmental examIts largest knowledge area is Project Sitework, not hydraulics. By the NCEES specification's own ranges, 20 to 30 of the 80 questions are not water engineering at all.Do you need a prep course to pass the FE or PE?Nothing in NCEES's rules asks for one, and the handbook is free. What a course adds, who gains from one, and a ten-problem test to run before paying anyone.

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