SCE PE Water Resources & Environmental case studies
SCE PE Water Resources & Environmental · Put your knowledge to work in context.
The Principles and Practice of Engineering (PE) exam is NCEES's discipline-specific licensure examination, described by NCEES as testing "a minimum level of competency in a particular engineering discipline." The Civil: Water Resources and Environmental exam is one of more than 20 PE exams NCEES offers and is designed for engineers who have gained a minimum of four years of post-college work experience in their chosen discipline. Content is quantitative and reference-driven rather than recall-based. The SCE PE Water Resources & Environmental case studies are 5 cases and about 2,027 words.
1Urbanization and Detention Sizing in a 240 ha Watershed
A 240 ha watershed is being converted from 50% forest (CN 55), 40% pasture (CN 70), and 10% impervious (CN 98) to 20% forest, 35% lawn (CN 70), and 45% impervious. The design storm is 100 mm in 24 h.
468 words, about 2 min2Force Main Operating Point and Surge After Valve Closure
A 600 m long, 400 mm inside diameter HDPE force main conveys 120 L/s from a wet well to a treatment plant. Static lift is 18 m.
330 words, about 2 min3Trapezoidal Channel Capacity and Freeboard Under Backwater
A 4.0 m bottom-width trapezoidal channel has 2H:1V side slopes, a longitudinal slope of 0.0015, and Manning n=0.030. The design peak flow is 8.0 m3/s.
369 words, about 2 min4Activated Sludge SRT, Wasting, and Nitrification Alkalinity
A municipal activated-sludge plant receives 15,000 m3/d with influent BOD5 250 mg/L, TSS 220 mg/L, TKN 38 mg/L, and alkalinity 160 mg/L as CaCO3. Four aeration tanks provide 8,000 m3 total volume, and MLSS is 3,500 mg/L.
416 words, about 2 min5Choosing a Treatment Upgrade Under Capacity and Regulatory Risk
A 45,000-person utility has an average demand of 22,000 m3/d and a peak of 32,000 m3/d. Its conventional plant is rated 25,000 m3/d and must reduce TOC by 35% within 3 years to control disinfection by-products.
444 words, about 2 min