Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)
National Exams — May 2015 — 04-Env-A3 / Geotechnical & Hydrogeological Engineering. 3 hours duration; open book exam, any non-communicating calculator permitted. The first five questions as they appear in the answer book are marked (20 marks each, 100 marks total); all six are solved below for completeness.
Reference texts. Braja M. Das, Principles of Geotechnical Engineering (9th ed.) — weight–volume relations, USCS classification, seepage/flow nets, slope-stability and stress-distribution chapters; Craig & Knappett, Craig's Soil Mechanics (8th ed.) — flow-net construction and Taylor's stability-number method; Freeze & Cherry, Groundwater (1979) — Darcy's law and the Dupuit–Thiem equation for radial flow to a well.
