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SANTA ANA CLIMATE ACTION PLAN INITIAL STUDY CITY OF SANTA ANA Less than Significant Impact. According to the of City's General Plan Public Safety Element, throughout the Santa Ana River Basin, the potential exists for flooding resulting from the failure of Prado Dam.39 However, the General Plan states that the Santa Ana River itself does not present a significant flood hazard. Additionally, as a part of the Santa Ana River Project, the Prado Dam is currently being expanded to increase reservoir storage capacity from 217,000 acre -feet to 362,000 acre- feet.40 Improvements began in 2003 and are estimated to be completed in 2020.41 In order to ensure development is not subject to flood hazards, the City established regulations in areas prone to flooding. The regulations require that construction of new development or improvements in these areas must be elevated above the base flood. Therefore, compliance with existing regulations would ensure impacts that would expose people or structures to flooding would be less than significant. j) Inundation by seiche, tsunami, or mudflow? No Impact. The Draft CAP does not recommend any measure that would result in inundation by seiche, tsunarni, or mudflow. Seiches are large waves generated in enclosed bodies of water in response to ground shaking; however, there are no large artificial bodies of water within the City. Tsunamis are tidal waves generated in large bodies of water caused by fault displacement or major ground movement; however, the City of Santa Ana is located approximately five miles from the coast and is not within a tsunami inundation zone.42 Mudflows occur on hillsides where unvegetated and undeveloped surfaces are exposed to rainfall, however, the City of Santa Ana is built out with limited amounts of vacant land and is relatively flat. Therefore, no impacts associated with inundation from seiche, tsunami, or mudflow would occur. 3.10 LAND USE AND PLANNING a) Physically divide an established community? Less than Significant Impact. The Draft CAP is a policy -based document that does not directly involve the construction of a specific project. Implementation of the Draft CAP and its measures would enhance pedestrian, bicycle, and transit connectivity and encourage the development of residential nodes near retail and employment nodes, which could result in the development of structures or improvements that could divide an established community. However, implementation of the Draft CAP intends to increase connectivity throughout the City by implementing both external and internal design guidelines for bike, pedestrian, and transit connectivity, which would connect existing residential development to nearby sidewalks and bus stops. Therefore, impacts to established communities would be less than significant. 39 City of Santa Ana Planning Division. City ofSanta Ana General Plan Public Safety Element p. 11. Adopted September 20, 1982. Available online at http' / /wanv ci santa -ana ca. us/ Uticrall2lan /documentsZPublic6afely,pdf, accessed August 31, 2015. 40 Orange County Public Works Flood Division. Santa Ana River Project, Project Description. Website: http : / /ocf1ood com /sgg)/I)roiecr, accessed October 13, 2015. 41 Orange County Public Works Flood Division. Santa Ana River Project, Project Cost and Schedule. Website: httl2: //`ocflood.com/saipZcQ5t accessed October 13, 2015. 42 California Department of Conservation. California Geological Survey Tsunami Inundation Map for Emergency Planning Newport Beach Quadrangle. March 15, 2009. Available online at: http:/ /w .conserva6oru.ca.gov/ cgs /geologic_ hazards /Tsunami/ Inundation _Maps /Orange /Documents / Tsunam i_Inundat ion _NewportBeach_Quad_Orange.pdf, accessed August 31, 2015. October 2015 Page 39 75B -137