C+S June 2022 Vol. 8 Issue 6 (web)

Ronan. “That’s what is new and has never been done in New York City on a water main.” Ronan says the reason this dual compound curve was chosen was to avoid trees, wetlands, city streets, and seawalls. The team worked consistently throughout the project to keep the is - land’s tight-knit and well-informed community members onboard with project goals and the construction schedule. Improved Water Capacity and Infrastructure Resilience The project improved water capacity and infrastructure resilience for City Island by increasing the size of the main, resulting in more po - tential waterflow. The first water main was tested and put into service last fall.

Ronan says one of the project’s biggest takeaways is a blueprint that can be applied in the future for tunneling under waterways throughout the city in areas with extremely tight launch and landing point condi- tions. These previous experiences can assist the designers, contractors, and municipalities with future decisions and help to carry out studies and construction to the next level. The project received the American Council of Engineering Companies (ACEC) New York Engineering Excellence Diamond Award – a top honor presented by the organization.

Introduction Due to the effects of extreme weather events and climate change, many beachfront developments in Southern California are experiencing rapid beach erosion and shoreline retreat. Rising sea levels and increasing wave action are causing many deleterious effects to California’s coastline, in - cluding loss of sensitive habitats, recreational assets, public and private properties, and civil infrastructure. To mitigate these effects, numerous short-term beach erosion mitigation strategies and products have been employed across the Southern California coastline, having a wide range of results. The purpose of this case study is to discuss the performance of various beach erosion countermeasures as short-term beach erosion mitigation solutions at Capistrano Bay Community, a Special Govern - ment District located in the City of Dana Point, California. Background The Capistrano Bay Community Service District (“The District”) is located along a thin strip of beach between the Pacific Coast Highway and the Pacific Ocean, at the southeast end of Dana Point. The District PERFORMANCE OF SHORT-TERM BEACH EROSION MITIGATION AT CAPOSTRANO BAY COMMUNITY Capistrano Bay Community Service District Dana Point, California By Craig Wright

was formed in 1959, when the Orange County Board of Supervisors voted to approve the request of Beach Road property owners to convert the community into a Special Government District. The District receives a percentage of the property taxes generated from the community as well as a District User Fee to fund its operations. To fund large-scale capital improvements, the District formed an Assess - ment District (AD99-1) in 2003, which generated funding for replace - ment of a roadway, curbs, gutters, and storm drain systems. The District has suffered notable beach damage from high-energy storm events during high tides on several occasions over the past sev - eral decades. Significant storms in 2005 and 2011 resulted in the loss of large volumes of sand. On November 30, 2018, high surf and high tides destroyed a wooden walkway, seawall, and basketball court. The District was most recently affected by a beach erosion event on July 4,

Figure 1: Evidence of beach loss at The District

Suspended steps and exposed foundations

Suspended steps illustrates relative loss of beach sand at The District



June 2022

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