addressing climate change adaptation in regional transportation plans

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Setting and HistoryThe California Delta is the center of a vast river network that drains the centralvalley of California, receiving roughly 80 percent of the water in the state (DeltaVision, 2008). The Delta is fed by several rivers, the largest being the SacramentoRiver and the San Joaquin River, in addition to the Mokelumne, American, andCalaveras rivers. These rivers empty into the low-lying basin of the Delta, whichoutlets to San Francisco Bay and then the Pacific Ocean.Before the 1850s, the Delta was nourished by semi-annual flooding and theaccompanying sediment deposits, making for vast wetlands of channels andislands. As the sediment supply was curtailed through flood control and theland was converted to agriculture, the elevation of large portions of the Deltadropped below sea level making this area prone to more frequent flooding.Levees were constructed to protect the agricultural and residential areas onwhat are now below-sea-level islands. The drop in elevation continues, resultingin a need for increased levee height over the roughly 2,000 kilometers of leveesthat continuously hold back water in the low-lying areas(see Figuire 8).The state water system (Central Valley Project and State Water Project) relies onthe Delta as the conduit for water exported from the north to the south. In itsentirety, the Delta is home to over half a million people, yet more than 23 millionpeople rely on water that travels through the Delta, and one sixth of all irrigableland in the United States is in the Delta watershed (PPI, 2007). Conditions in theDelta have been altered dramatically from its pre-developed state. These changeshave endangered many native species and created habitat for even more nonnativespecies.The water supply, economic viability, and environmental resources of the Bay-Delta region are critical to the state.Climate Change Impacts in the Lower Bay-DeltaClimate change is expected to result in the following impacts in the lower Bay-Delta:• Higher temperatures and increased storm/wind activity may exacerbatedrops in elevation of low-lying areas.• Changes in the magnitude of precipitation and precipitation/snowmelt runoffintensity may reduce control of the salt water front that is artificially helddownstream of water export pumps.• Sea level rise is not expected to have an appreciable impact on the seismicvulnerability of the lower Delta.APG: UNDERSTANDING REGIONAL CHARACTERISTICS PAGE 52
CA Climate Adaptation Planning GuideCal Poly, San Luis ObispoCity and Regional Planning- CAEDMarch 2012Figure 8. Bay-Delta Region with ElevationPAGE 53APG: UNDERSTANDING REGIONAL CHARACTERISTICS
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Addressing Climate Change Adaptatio
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appendix b reportState-of-the-Pract
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State-of-the-Practice Climate Chang
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C A L I F O R N I AADAPTATIONPLANNI
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Adaptation Planning Guide - Advisor
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List of Tables (cont’d.)Table 6.
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Climate Impact RegionsThe APG is or
Page 196 and 197: APGSTART HERE:PLANNING FOR ADAPTIVE
Page 198 and 199: What are the designated climate imp
Page 200 and 201: CA Climate Adaptation Planning Guid
Page 206 and 207: • Selected Demographic Data. Sele
Page 208 and 209: Cal-Adapt ProjectionsTable 1. Summa
Page 210 and 211: Selected Infrastructure and Regiona
Page 212 and 213: illnesses due to air pollution resu
Page 214 and 215: Additional Resources• Sea level r
Page 216 and 217: Cal-Adapt ProjectionsTable 5. Summa
Page 220 and 221: frequency can harm forests. Large i
Page 222 and 223: Bay Area RegionCounties: Alameda, C
Page 224 and 225: the Sacramento and San Joaquin rive
Page 226 and 227: Table 12. Selected Population Data
Page 228 and 229: Sea level rise is also expected to
Page 230 and 231: Additional Resources• Public Heal
Page 232 and 233: Cal-Adapt ProjectionsTable 13. Summ
Page 236 and 237: Table 16. Selected Population Data
Page 238 and 239: As with crops, climate change impac
Page 240 and 241: Additional Resources• Wildfire Re
Page 242 and 243: elevations, increased static levee
Page 244 and 245: The ecosystem functions of the Delt
Page 248 and 249: The islands in the lower Bay-Delta
Page 250 and 251: Some of the questions that should b
Page 252 and 253: Southern Central Valley RegionCount
Page 254 and 255: Biophysical CharacteristicsThe west
Page 256 and 257: The crops produced are varied and i
Page 258 and 259: Communities in this region should e
Page 264 and 265: have the resources to prepare for,
Page 266 and 267: Additional Resources• Sea Level R
Page 272 and 273: Timber practices have also had ecos
Page 274 and 275: Southeast Sierra RegionCounties: Al
Page 276 and 277: Biophysical CharacteristicsThe sout
Page 278 and 279: ultimately result in reduced water
Page 284 and 285: particular concern are populations
Page 286 and 287: Additional Resources• Sea Level R
Page 292 and 293: industry around Big Bear. As there
Page 294 and 295: California Natural Resources Agency
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