The seawall is an important infrastructure construction that guards the airport from high tides and protects against runway flooding. The repairs necessary to fix the seawall will cost $1.5 million, with the main fix being the placement of around 2,000 feet of riprap along seawall. Riprap refers to use of materials like large rocks to shore up the structure.
Read more: http://www.bizjournals.com/sanfrancisco/news/2016/12/06/sfo-repair-seawall.html