Coastal Construction Manual - National Ready Mixed Concrete ...

3 IDENTIFYING HAZARDS
(which is largely composed of fine-grained glacial deposits). Designers should refer to Keillor (1998) for more
information on this topic.
Erosion is capable of threatening coastal residential buildings in a number of ways:
Destroying dunes or other natural protective features (see Figure 3-31)
Destroying erosion control devices (see Figure 3-32)
Lowering ground elevations, undermining shallow foundations, and reducing penetration depth of pile
foundations (see Figure 3-33)
Transporting beach and dune sediments landward, where they can bury roads and buildings and
marshes (see Figure 3-34)
Breaching low-lying coastal barrier islands exposing structures on the mainland to increased flood and
wave effects (see Figures 3-35 and 3-36)
Eroding coastal bluffs that provide support to buildings outside the floodplain itself (see Figure 3-37)
Sand that is moved during erosional events can create overwash and sediment burial issues. Further, the
potential for landslides and ground failures must also be considered.
Figure 3‐31.
Dune erosion in Ocean
City, NJ, caused by the
remnants of Hurricane
Ida (2009) and a previous
nor’easter
3-36 COASTAL CONSTRUCTION MANUAL