Subsidence, the sinking of land, is a phenomenon impacting various regions, including areas near the Puget Sound. While the rate of subsidence in the Puget Sound is relatively slow, ranging from 1.5 to 2.5 mm per year, this seemingly small amount accumulates significantly over time. Bank erosion is another issue that can affect waterfront properties. In some areas of Whidbey Island the bank is eroding at 2-5 inches a year!!
The experience of Florida condominiums, where dozens of luxury buildings have sunk up to three inches in recent years, provides a stark reminder of the potential consequences of subsidence. While experts in Florida suggest that some sinking is normal and often accounted for in building design, they also emphasize that significant changes in soil conditions, often caused by the building’s weight compacting the soil or groundwater fluctuations, can contribute to accelerated subsidence. This highlights the importance of regular structural assessments and proactive maintenance for condominium buildings, especially those located in areas prone to soil changes or near bodies of water.
For Washington State condominium owners, the key takeaway is to be aware of the long-term implications of subsidence and increased rainfall. While the immediate risks may appear less dramatic than coastal flooding or rapid sinking, the cumulative effects over decades can impact property stability and increase maintenance costs. Condominium associations should consider incorporating these factors into their long-term planning, including reserve studies that account for potential infrastructure adjustments related to changing water levels and soil conditions. If there are any concerns about the association building I highly recommend getting a structural engineer to review and determine if repairs are needed.
