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NCARB Project-Planning-Design Exam - Topic 4 Question 19 Discussion
Topic #: 4
A proposed six-story commercial building will have a basement level with finished floor 20'-0" below grade. The building site is located less than 1 mile from the coastline. A site survey indicates that the average site elevation is 5'-0" above sea level.
Based on the site-specific conditions, which four issues should the architect address in the design? Check the four that apply.
Comprehensive and Detailed
Dewatering during construction (A): The deep excavation (20' below grade) near sea level likely intersects the water table, necessitating dewatering to keep the site dry during construction.
Water table height (B): Proximity to the coast raises the water table, which affects foundation and waterproofing design.
Potential corrosion due to salt (D): Salt in water vapor and marine air can corrode metal exterior finishes and reinforcements; materials and coatings must be selected accordingly.
Hydrostatic pressure on basement walls (E): High water tables create significant lateral water pressure requiring robust waterproofing and structural resistance.
Spread footings (C) may or may not be suitable depending on soil but are not specific to coastal or basement conditions.
Radiant flooring (F) is unrelated to site conditions and more a mechanical choice.
ARE 5.0 PPD -- Environmental Conditions and Context, Site and Foundation Design
The Architect's Handbook of Professional Practice, 15th Edition -- Coastal and Marine Environment Design
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