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16-Civ-A3 Elementary Environmental Engineering · Undated paper

Question 4 of 7: Growth Drivers — Impacts & Engineering Solutions

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

Notes on this paper

Paper format. National Exams, May 2019 — 16-Civ-A3 Elementary Environmental Engineering. Closed book (one 8.5″×11″ double-sided aid-sheet), 3 hours. Seven problems; any five constitute a complete paper (each 20 marks). All seven are solved here as a study resource.

Reference texts. Davis & Cornwell, Introduction to Environmental Engineering (5th ed.); Mihelcic & Zimmerman, Environmental Engineering: Fundamentals, Sustainability, Design (3rd ed.); Metcalf & Eddy, Wastewater Engineering: Treatment and Resource Recovery (5th ed.); MWH (Crittenden et al.), Water Treatment: Principles and Design (3rd ed.); CCME Canadian Environmental Quality Guidelines; Health Canada Guidelines for Canadian Drinking Water Quality; Impact Assessment Act (Canada, 2019).

Source note. The seven questions and their sub-part mark splits follow the paper’s own Marking Scheme (page 7): 1 (6/6/8), 2 (7/7/6), 3 (8/5/7), 4 (6/7/7), 5 (10/10), 6 (3/3/4 + 3/3/4), 7 (10/10) — each closing to 20 marks. Where a figure ordinate must be read off a plot it is flagged in a check callout.

Question 4: Growth Drivers — Impacts & Engineering Solutions (20 marks)

Question text not reproduced: the examination questions are © Engineers and Geoscientists BC. Open the official past paper (linked at the top of this page) to read the question, then follow the worked solution below.

Each growth driver produces both an air-emissions impact and a water-quantity/quality impact; for each, a paired engineering solution is given below.

Impact–solution matrix for the three growth drivers
DriverImpact (emissions)SolutionImpact (water)Solution
(i) Economic growth (6)Industrial process & freight emissions (NOx, SO2, PM, CO2)Cleaner production + end-of-pipe controls (scrubbers, ESPs, low-NOx burners); emissions permittingHigher industrial effluent load & process water demandWater reuse/recycling, tightened industrial pretreatment & discharge limits
(ii) Population expansion (7)More vehicle & domestic combustion; urban air quality declineTransit/active-transport planning, vehicle standards, land-use densification to cut tripsGreater sewage volume + stormwater runoff from new impervious areaExpanded/upgraded WWTP capacity (nutrient removal) and low-impact-development stormwater controls
(iii) Energy-use increase (7)Power-sector GHG, SO2, NOx, mercury, particulatesShift to renewables/low-carbon generation, efficiency (demand-side management), flue-gas desulfurization & carbon captureThermal & cooling-water discharge, mine/ash-pond leachateClosed-cycle (dry) cooling, thermal-discharge limits, lined ash ponds & leachate capture

Discussion. The recurring theme is that each driver stresses both the airshed and the watershed, and that the strongest response pairs source reduction (cleaner production, efficiency, modal shift, densification) with end-of-pipe control (scrubbers, nutrient-removal plants, LID stormwater, cooling upgrades). Meeting “strict environmental requirements” under growth therefore relies on decoupling — delivering more economic output, more people served, and more energy while holding or reducing the per-unit pollutant and water footprint. Economic growth is weighted lightest (6 marks) because its impacts are largely captured under the population and energy drivers; the two heavier drivers (7 marks each) directly scale municipal and power-sector loads.