{"id":617377,"date":"2026-04-20T21:42:11","date_gmt":"2026-04-20T21:42:11","guid":{"rendered":"https:\/\/www.newsbeep.com\/ca\/617377\/"},"modified":"2026-04-20T21:42:11","modified_gmt":"2026-04-20T21:42:11","slug":"the-silent-engineering-impacts-of-water-dynamics","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/ca\/617377\/","title":{"rendered":"The Silent Engineering Impacts Of Water Dynamics"},"content":{"rendered":"

\"Cracked<\/a><\/p>\n

Photo courtesy HKA.<\/p>\n

Water is Earth\u2019s most dynamic force \u2013 it is a shapeshifter governed by celestial mechanics and geological constraints and it requires a vigilant approach to engineering for construction projects, large and small. When it comes to the impacts of rainfall and groundwater, there is much more than meets the eye. Water can act as both architect and stealth saboteur, with the power to support or destroy foundations, infiltrate the bones of buildings and compromise structural integrity if not factored into site planning, design and construction with thorough technical expertise and foresight.<\/p>\n

From weather systems shaped by solar heat and planetary motion to the fundamental laws of water\u2019s underground behaviour, understanding water dynamics and the silent implications for engineering is crucial for avoiding costly, destructive issues and rectifying failures alike.<\/p>\n

Understanding how water moves: From atmospheric currents to underground flows<\/p>\n

Earth\u2019s weather is a vast, interconnected machine powered by two primordial forces. The sun\u2019s radiant energy warms the planet unevenly, creating temperature gradients that force air and water to move as nature attempts to redistribute heat. At the same time, the Earth\u2019s rotation generates prevailing wind patterns and shapes ocean currents, affecting climates and distinct microclimates in which buildings and infrastructure must withstand specific weather conditions.<\/p>\n

While understanding weather patterns, especially those related to precipitation, for any given site is necessary for sound engineering, they must be assessed in the context of how water behaves at the Earth\u2019s surface. Rainfall can sheet across city streets, erode bare hillsides and swell creek beds into torrents. A downtown block may shed 90% of rainfall as runoff, but a less developed landscape with more vegetation might absorb 90% of it back into the Earth. The latter prevents floods, whereas the former creates them.<\/p>\n

Soil science matters<\/p>\n

Not all ground absorbs water equally. Scientists classify soil by texture and infiltration rates. These properties affect three critical engineering criteria: the soil\u2019s bearing capacity, the soil\u2019s impact on structural settlement, and the soil\u2019s behavior when subject to groundwater migration.<\/p>\n

The ideal soil composition for structural bearing capacity is a mixture of various soil types called\u00a0engineered granular fill. A well-distributed range of soil particle sizes blends the strengths of each soil classification to provide strength, drainage, and resistance against settlement. See the table below for the features of the multiple soil types.<\/p>\n

Soil types and features<\/p>\n

Soil type
\nParticle size
\nPermeability
\nWhere found
\nWater impact<\/p>\n

Gravel
\n>2 mm
\nLightning fast (10+ in.\/h)
\nRiverbeds, construction fill
\nDrains instantly<\/p>\n

Sand
\n2.0-0.05 mm
\nFast (6 in.\/h)
\nBeaches, deserts
\nWater slips away, causing drought-prone conditions<\/p>\n

Silt
\n0.05-0.002 mm
\nModerate (0.2-0.6 in.\/h)
\nFloodplains, midwestern farms
\nHolds moisture, but erodes easily<\/p>\n

Clay
\n<0.002 mm
\nSlow motion (0.02 in.\/h)
\nUrban wetlands, southern states
\nWater pools, causing swelling\/shrinking<\/p>\n

Loam
\nBalanced sand-silt-clay
\nControlled
(0.6-2 in.\/h)
\nHealthy forests, vineyards
\nStores water, yet drains excess<\/p>\n

Water\u2019s underlying structural implications<\/p>\n

Beneath every building, unseen tension is constantly at work as soil and water conspire to uplift, crack and damage built structures. These conditions, specific to individual locations and climates, create obstacles that can seriously undermine a building\u2019s stability and incur hefty remediation costs. Some of the most common water-related challenges builders face\u2014and engineering solutions that address them\u2014include:<\/p>\n

Seasonal shifts.\u00a0Beneath the surface, water wages seasonal battles that reshape landscapes and infrastructure. When saturated soils freeze in winter, they expand by 9%, generating enough force to snap concrete footings at 2,000+ pounds per square inch (PSI) and lift fence posts by 4 in. in a single season. Ad-freezing, where frozen soil bonds to foundations, creates uneven uplift and additional engineering challenges. Conversely, clay soils shrink as they dry in the summer, forming deep desiccation cracks and causing buildings on shallow foundations to tilt several degrees. In fact, the Leaning Tower of Pisa owes its famous tilt in part to seasonal fluctuations in groundwater levels.<\/p>\n

Engineering solutions:\u00a0It is imperative to ensure the underlying soil can withstand seasonal changes in groundwater and temperature. Deep foundations can mitigate the effects of surface soil drying, and foundations must be constructed beneath the frost penetration depth to avoid frost heaving. Installing a drainage layer against the foundation wall can also mitigate frost heaving. Additionally, adequately reinforcing footings can help resist uplift forces from a rising groundwater table.<\/p>\n

Rising water tables.\u00a0Water that is absorbed back into the Earth does not sit still. It percolates down until it hits bedrock or the water table, then flows sideways, often for years, through what hydrologists call \u201cthe unsaturated zone.\u201d Water tables are rising in many coastal areas due to rising sea levels. This occurrence can exert 62.4 lb\/ft\u00b3 of uplift, enough force to cause structural damage to a building foundation without proper drainage or waterproofing systems, or to a concrete slab built on clay soil.<\/p>\n

Engineering solutions:\u00a0Designing appropriate stormwater site and foundation drainage is key to managing groundwater. The use of a clear drainage layer beneath the foundation can also be considered. To combat uplift, a building foundation can be designed with adequate reinforcement and size to resist the force or deep foundations can be used to increase uplift resistance using either anchorage to bedrock or frictional resistance. Alternatively, structures can be designed and built above the high water table or groundwater flow by raising the grade or elevating the structure.<\/p>\n

Ground sinking or settling.\u00a0In contrast to rising water tables, pumping large amounts of groundwater for irrigation, industrial purposes or human consumption compresses the Earth\u2019s aquifer layers. This causes subsidence, the gradual sinking or settling of the ground. As aquifers compress, Mexico City sinks almost two inches each year, Venice sinks 1 to 2 mm annually and Bangkok\u2019s skyscrapers require hydraulic jacks to remain level.<\/p>\n

Engineering solutions:\u00a0In addition to managing groundwater, the building design should incorporate appropriate measures to prevent subsidence-related issues. For example, a building can be supported on deep foundations resting on firmer, denser soils. Another option is to inject grout or cement into the soil to provide a stronger and stiffer base to support the building.<\/p>\n

Hydrostatic pressure.\u00a0Underground water at rest exerts hydrostatic pressure on building foundation walls and slabs, which must be anticipated and accounted for by construction engineers, especially in areas with rising water tables or heavy rainfall. This pressure can exert 9.81 kilonewtons (kN)\/m\u00b2 per meter of depth and cause horizontal cracks at approximately one-third of the wall height where the bending stress peaks. It can also cause inward bowing of cinder block walls at sustained pressures of 15+ kilopascal (kPa) and shear failure at wall corners when pressure exceeds 35 kPa.<\/p>\n

Engineering solutions:\u00a0Reinforcing foundation walls and creating a clear drainage layer against the exterior face of the foundation walls allows groundwater to drain down toward a foundation drainage system, alleviating hydrostatic pressure. Internal reinforcement with buttress walls, shear walls or other horizontal assemblies, such as floors, can also assist with lateral resistance against hydrostatic pressure.<\/p>\n

Premature deterioration.\u00a0Water\u2019s physical properties attract it to porous materials due to capillary action. This means water can climb concrete pores up to 15 feet, rusting rebar from within and leading to the premature deterioration of masonry or concrete. In regions with winter weather, repetitive freeze-thaw cycles can significantly worsen damage to building materials, particularly concrete or masonry that is not adequately protected against moisture and freezing.<\/p>\n

Engineering solutions:\u00a0To combat this challenge, crystalline waterproofing can be used to fill the capillaries of porous building materials, creating a watertight barrier that helps uphold structural integrity. Additional solutions include other forms of waterproofing, extending foundations above finished grade (ground level), and intentionally using less permeable building materials. For concrete, adding air entrainment of 5% to 8% (essentially small air bubbles) also mitigates the adverse effects of repetitive freeze-thaw cycles.<\/p>\n

Ultimately, each building demands its own careful technical analysis and engineering measures to safeguard against the effects of water, which can be disruptive at best and catastrophic at worst. Even seemingly minor miscalculations or oversights can stress or strain structural systems, emphasizing the need for rigorous evaluation and planning.<\/p>\n

Working with water, not against it<\/p>\n

From the moment rain touches the ground to its slow journey through soil and rock, water follows the relentless laws of physics\u2014seeping through cracks, expanding when frozen, and pushing against anything in its path. The difference between a flooded basement and a stable foundation, or between structural supports eroding or remaining intact, often comes down to one principle: understanding how water moves.<\/p>\n

Modern engineering must design buildings to coexist with water\u2019s natural behavior. Whether it is directing runoff away from foundations, choosing the right soil for proper drainage, or protecting concrete against freeze-thaw cycles, the best solutions work with water\u2019s forces, not against them. As climate change brings heavier rains and more extreme droughts, these strategies are not just smart\u2014they are essential for building resilient, long-lasting structures.<\/p>\n

Edward Poon is a forensic engineer and director with HKA<\/a>. He has more than 20 years\u2019 experience in the construction industry.<\/p>\n","protected":false},"excerpt":{"rendered":"Photo courtesy HKA. Water is Earth\u2019s most dynamic force \u2013 it is a shapeshifter governed by celestial mechanics…\n","protected":false},"author":2,"featured_media":617378,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[49,48,66],"class_list":["post-617377","post","type-post","status-publish","format-standard","has-post-thumbnail","category-science","tag-ca","tag-canada","tag-science"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/posts\/617377","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/comments?post=617377"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/posts\/617377\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/media\/617378"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/media?parent=617377"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/categories?post=617377"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/tags?post=617377"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}