Flood zones are defined by the Federal Emergency Management Agency (FEMA) to identify varying levels of flood risk and inform the Flood Insurance Rate Map. Floods are the second-most common natural disaster, and they often occur quickly in low-lying areas after heavy rains. The 100-year floodplain is the area that has a 1-percent-annual-chance of flooding and is also referred to as the base flood, while moderate flood hazard areas are between the limits of the base flood and the 0.2-percent-annual-chance or 500-year flood.Source: FEMA, 03/18/2019 - 17:11 Last updated May 21, 2019
Flood zones are defined by the Federal Emergency Management Agency (FEMA) to identify varying levels of flood risk and inform the Flood Insurance Rate Map. Floods are the second-most common natural disaster, and they often occur quickly in low-lying areas after heavy rains. The 500-year floodplain is the area that has a 0.2-percent annual chance of flooding and is also referred to as the moderate flood hazard area. These are between the limits of the 1-percent-annual-chance (base flood) and the 0.2-percent-annual-chance.Source: FEMA, 03/18/2019 - 17:11 Last updated May 21, 2019
The amount of carbon stored in live vegetation such as trees, shrubs, and grasses. A common method to estimate aboveground carbon includes transferring calculations of biomass sampled at the plot scale to remotely-sensed data such as satellite imagery or aerial LiDAR, using metrics such as vegetation type, size class, and canopy density. Broadcasting individual biomass samples to remotely-sensed data enables wide-area estimation of carbon storage.Source: Gonzalez et al., 2015 Minimum Acreage Threshold: 100.0 acres Last updated May 21, 2019
Of California’s approximately 100 million acres of land, 43 million acres are used for agriculture. Of this, 16 million acres are grazing land and 27 million acres are cropland. Only about 9 million acres of irrigated land, or one-third of the state’s cropland, are considered to be prime, unique or of statewide importance (2009).Source: California Department of Food and Agriculture Last updated May 21, 2019
Jurisdictional policies adopted to protect farms and ranches from urban development. Policies include Napa County's Measure J (extended to 2058 as Measure P in 2008) and Solano County's Orderly Growth Initiative (extended to 2028 as Measure T in 2008), in which changes to General Plan policies describing intent, minimum parcel size and maximum building intensity of lands designated "Agricultural Resource" or "Agriculture, Watershed, Open Space" cannot occur unless approved by the voters. Includes city and county area policies that prioritize agricultural conservation of natural resources and preservation of farms and ranches, based upon counties' general plans and zoning maps.Source: Greenbelt Alliance, 2017 Last updated May 21, 2019
Jurisdiction: U.S. Fish & Wildlife Service, Alameda County, Contra Costa County Protection: When a species is proposed for listing as endangered or threatened under the U.S. Endangered Species Act, the U.S. Fish and Wildlife Service (USFWS) must consider whether there are areas of habitat believed to be essential to the species' conservation. Those areas may be proposed for designation as critical habitat. Critical habitat for the Alameda whipsnake was designated by USFWS in 2006. Read more on the USFWS site.Source: U.S. Fish & Wildlife Service, Critical Habitat Rule, October 2, 2006. Last updated May 21, 2019
Jurisdiction: U.S. Fish & Wildlife Service, Alameda County, Contra Costa County Protection: The Altamont Pass Wind Resources Area Conservation Plan is being developed to minimize impacts to birds caused by wind turbines, and conserve birds and other terrestrial species while allowing wind energy development and operations in the area.
The likelihood of urban development over the next several decades based on a spatial comparison of weighted or scored layers between development pressure factors against policy protection factors. The probability of development is divided into three categories as high risk of urban development within 10 years, medium risk from 10 to 30 years and low risk as more than 30 years chance of developing.Source: Greenbelt Alliance
Large Landscape Blocks are areas of high ecological integrity that build upon existing protected areas and serve as the end points for the Critical Linkages. The California Protected Areas Database and Conservation Easements were used as the foundation to delineate large landscape blocks for the greater Bay Area region. Protected areas were aggregated if within 500m of each other (easements whose primary purpose was agriculture, farmland, or cultural/historical were excluded from this step). Urban land was then removed from the resulting 500m aggregation to ensure only natural, grazing, and agriculture land was included in the aggregation along with protected lands and conservation easements. A roadless area analysis was then conducted to identify areas of high ecological integrity.Source: Bay Area Open Space Council, Conservation Lands Network
The broader regions of connectivity important to facilitate the movement of multiple species and maintain ecological processes. The Bay Area Critical Linkages is a network of habitat linkages designed for a number of focal species. These linkages, together with the large landscape blocks they connect and the key riparian corridors, buffer zones, and important baylands they encompass, represent the mosaic of habitat needed for conserving biodiversity. The Bay Area Critical Linkages is meant to build upon our existing conservation investments and identify those areas needed to maintain those investments.Source: Bay Area Open Space Council, Conservation Lands Network
The San Francisco Bay has lost an estimated 85 percent of its historic wetlands to development or other alteration. Thus, all remaining wetland habitat is a conservation priority. The San Francisco Estuary Institutes (SFEI) map of modern baylands shows remnant tidal marsh, as well as filled and diked former baylands. Learn more about the baylands at http://www.sfei.org/ecoatlas.Source: San Franciso Estuary Institute, BBARI v2
The areas identified as important for protection and conservation falling under the jurisdiction of the Bay Conservation and Development Commission (BCDC). The Commission holds authority over development projects falling within the San Francisco Bay, including Suisun, San Pablo, Honker, Richardson, San Rafael, San Leandro and Grizzly Bays and the Carquinez Strait; certain waterways that flow into the Bay; certain salt ponds or managed wetlands around the Bay; a shoreline band jurisdiction which extends 100 feet inland from the Bay; and the Suisun Marsh. Layer created by Greenbelt Alliance based upon plan maps and jurisdictional coverage description available through San Francisco Bay Plan website.Source: Greenbelt Alliance Last updated May 4, 2017
This data set uses the following bike path classifications from cities and counties throughout the region. Class I: A shared-use path physically separated from motorized vehicular traffic by an open space or barrier. Class II: A bike lane on the roadway designated by striping, signing and pavement markings for the preferential or exclusive use of bicyclesSource: MTC, April 2018
Jurisdiction: CA Coastal Commission Protection: The Coastal Zone program manages the variety of planning, permitting, and non-regulatory mechanisms to manage its coastal resources, including issuing coastal development permits and reviewing local governments' Local Coastal Programs.
The Storie Index is a soil rating based on soil characteristics that govern the land's potential utilization and agricultural capacity. This land valuation is independent of other physical or economic factors that might determine the desirability of growing certain plants in a given location. The characteristics evaluated include suitable soil profiles, surface texture, slope, and dynamic properties.Source: USDA - Soil Survey Geographic Database
A city's boundary that defines where urban services and utilities are provided.Source: California Department of Forestry and Fire Protection, 2018
The evaporative demand exceeding available soil moisture.Source: USGS-BCM (Flint and Flint) Minimum Acreage Threshold: 100.0 acres
The California Natural Diversity Database (CNDDB) is a geographic and tabular inventory of the status and locations of rare plants and animals in California and is maintained by the biogeographic data branch of the California Department of Fish and Wildlife. CNDDB staff work with partners to maintain current lists of rare species and maintain an ever-growing database of GIS-mapped locations for these species. Species occurrence records in the CNDDB come from a variety of sources with differing accuracies. For the Greenprint, we filtered the records in order to report only recent records with a high degree of confidence in spatial accuracy. The table below for the table values used to filter records.Minimum Acreage Threshold: 20.0 acres
The ability of a particular coastal area and its communities to recover from flooding from extreme weather events. Climate change is predicted to have significant adverse effects in coastal zones due to the dangerous combination of storm surge, down-stream flooding, and sea level rise. In the Greenprint, coastal resilience focuses on nature's role in reducing coastal flood risk. Natural coastal habitats, such as wetlands, act to disperse storm energy and temporarily store flood water, which can reduce the level of vulnerability of coastal communities.Source: USGS/Our Coast Our Future; NOAA CCAP
The area under regulatory control by coastal management agencies over all federal activities and federally licensed activities that affect coastal resources.Source: Greenbelt Alliance, 2017
A Community of Concern in the Bay Area is defined as neighborhoods that have predominantly low-income and minority households, or that have a burden of social disadvantages. This layer is MTC Communities of Concern (2018) with American Community Survey Data (2012-2016).Source: MTC Last updated Dec. 3, 2018
A voluntary legal agreement between a landowner and a land trust or government agency that permanently limits uses of the land in order to protect its conservation values. The conservation easements in the Greenprint were obtained from the Bay Area Protected Areas Database (BPAD), a regional inventory of lands that have been permanently protected from development. Easements are generally not accessible to the public. For more information about protected lands and the BPAD, visit www.bayarealands.org.Source: Bay Area Protected Areas Database, version CCEd 2014a, 2014
The recommended configuration of interconnected habitats for preserving biodiversity in the Bay Area. Many factors were considered in the development of the CLN including the conservation targets (coarse and fine filter), goals for those targets, land use, proximity to existing protected lands, and conservation suitability (ecological integrity) of the landscape, in addition to the expert opinion of a focus team scientists. The CLN is complemented by the Bay Area Critical Linkages, which consists of lands that are important for movement of particular focal species such as mountain lion, badger, and deer.Source: Bay Area Open Space Council, Conservation Lands Network
Jurisdiction: Contra Costa County Protection: 50 ft from riparian buffer. Development that destroys riparian habitats will be held accountable for restoring amount of the habitat destroyed. Setback areas must be specific parameters in order to allow the best maintenance and prevent further damage.
The administrative division of a region which coordinates certain government functions, including law enforcement through court systems and sheriff's departments, transportation plans, and other services.Source: California Department of Forestry and Fire Protection
The zoning designations combined from the eight counties of the Bay Area without San Francisco. This information includes general and specific zoning codes with text descriptions copied from the original county map files online in 2016.Source: At Risk 2017 Last updated Aug. 1, 2016
The areas (critical habitat units) identified as essential for the conservation of a threatened or endangered species under the Federal Endangered Species Act that may require special management and protection.Source: U.S. Fish & Wildlife Service
The waterways and waterbodies identified as essential for the conservation of a threatened or endangered species under the Federal Endangered Species Act that may require special management and protection.Source: Greenbelt Alliance
The average dollar value of crops produced for each agricultural type. USDA and California Department of Forestry and Fire Protection's CALFIRE Fire and Resource Assessment Program (FRAP), in cooperation with California Department of Fish and Wildlife VegCamp program and extensive use of USDA Forest Service Region 5 Remote Sensing Laboratory (RSL) data, has compiled the "best available" land cover data available for California into a single comprehensive statewide data set.Source: USDA et al
A Disadvantaged Community is defined by the state of California as a neighborhood burdened by pollution and vulnerable to the adverse effects of pollution.Source: CA Office of Environmental Health Hazard Assessment
Urban investment in low-income communities and communities of color may fail to equitably distribute benefits to existing residents, leading to neighborhood gentrification and displacement of low-income and/or minority residents. The Urban Displacement Project at the University of California-Berkeley identifies three different displacement typologies: low-income communities at risk of gentrification and/or displacement, low-income communities experiencing ongoing gentrification and/or displacement, and moderate- to high-income communities in advanced gentrification.Source: Zuk, M., & Chapple, K. (2015). Urban Displacement Project. Last updated Jan. 1, 2015
The emissions from soil disturbance assume that 30% of the carbon stored in soils will be emitted. The emission estimates do not account for current land uses (i.e. current agricultural tilling) and therefore may be an overestimate of actual carbon emissions.
Source: EPA equivalencies calculator Last updated March 6, 2018
The areas where vegetation is likely to be highly stressed by climate change because the vegetation in those areas will likely experience climate conditions that are only marginally suitable or unsuitable.Source: Data based on methods from 'California Climate Vulnerability Assessment of Macrogroup Vegetation' Last updated Jan. 31, 2016
Land previously cultivated that was not in production in 2011, 2013, and 2014.Source: NASA/USGS, Fallowed Area Mapping for Drought Impact Reporting and Decision Making (not downloadable) Minimum Acreage Threshold: 100.0 acres
Land of importance to the local agricultural economy as determined by each county's board of supervisors and a local advisory committees.Source: Farmland Mapping and Monitoring Program, 2014 Minimum Acreage Threshold: 10.0 acres
Similar to Prime Farmland but with minor shortcomings, such as greater slopes or less ability to store soil moisture. Land must have been used for irrigated agricultural production in the last four years.Source: Farmland Mapping and Monitoring Program, 2014 Minimum Acreage Threshold: 10.0 acres
This mapping effort intends to create more accurate fire hazard zone designations that support fire mitigation strategies in areas where potential hazards warrant these investments. The fire hazard zones provide specific designation for application of defensible space and building standards consistent with known mechanisms of fire risk to people, property, and natural resources.Source: CalFire, 2014
Human-made barriers to salmonid migration, including road-stream crossings, irrigation diversions, and dams, that have been deemed priorities for removal by the California Department of Fish and Wildlife based on significance to fish migration. Migration passage impediments and delays affect both adult and juvenile fish. Given the magnitude and severity of barriers, and the decline of salmonid populations, reconnecting isolated stream habitat is an important priority for the restoration of impaired anadromous salmon and steelhead stocks.Source: CalFish, 2012
Complete, human-made barrier to fish passage for all anadromous species at all life stages at all seasonal flow levels. Total barriers to salmonid migration include some road-stream crossings and dams.Source: CalFish, 2018
Policies that provide limited protection to a range of natural and agricultural values. They include rural growth measures and open space reserves that are set aside permanently or temporarily by a single jurisdiction or among several jurisdictions.Source: Greenbelt Alliance
The undeveloped locations where it is easier to build new development, including parcels adjacent to existing and recent development as well as major roads, and low sloped lands.
The land on which existing vegetation is suited to the grazing of livestock.Source: Farmland Mapping and Monitoring Program, 2014 Minimum Acreage Threshold: 10.0 acres
Water that penetrates below the root zone, infiltrating soils and potentially replenishing aquifers.Source: USGS-BCM (Flint and Flint) Minimum Acreage Threshold: 633.0 acres
Plan Bay Area 2013, which projects growth patterns through 2040, presented a set of development scenarios with which to compare performance targets against regional goals, as well as for its environmental review process. The Regional Growth Trend scenario shows how the region would grow if current growth patterns failed to comply to existing growth boundaries and expanded to low-lying areas for continued urbanization along the city's or county's edges. The California Natural Resources Agency released a statewide report with results of a series of baseline population and urban growth projections for the states urban counties through the years 2020 and 2050. This data was presented in map and table form; these projections are based on extrapolations of current population trends and recent urban development trends.
Areas identified as important for protection and conservation in jurisdictional plans and in the Bay Area's Habitat Conservation Plans.Source: Greenbelt Alliance
San Ramon: Development prohibited within 100 feet of major, 50 feet of minor ridgelines. Additional permitting required for slopes exceeding 26%.
Hillside areas identified as important for protection or to minimize landslide threat based upon the physical descriptions in city and county general plans. Policies assess the slope of a hill, the area of a hill above a certain elevation, and the area within a certain vertical or horizontal distance from a ridge line.Source: Greenbelt Alliance
The data provides a comprehensive view of the distribution of past large fires going back to 1950.Source: CalFire
Cumulative hectares of suitable habitat in a 25 hectare region for species that may be impacted by proposed transportation projects in the next two decades. These species have some regulatory protective status that requires compensatory action to mitigate development impacts.Source: Bay Area Conservation Mitigation Assessment Huber et al. 2016 Minimum Acreage Threshold: 100.0 acres
Geologic conditions over aquifers that enable higher rates of recharge and therefore make the aquifer more susceptible to surface contaminantsSource: State Water Board
Section 303(d) of the Federal Clean Water Act gives states the responsibility of preparing a list of surface waters (e.g., water bodies and streams) not meeting water quality standards due to pollutants. To comply with 303(d), State and Regional Water Boards assess water quality monitoring data for California's surface waters every two years to determine if they contain pollutants at levels that exceed protective water quality standards. Water body and pollutants that exceed protective water quality standards are considered "impaired" and are placed on the State's 303(d).Source: Environmental Protection Agency
Section 303(d) of the Federal Clean Water Act gives States the responsibility of preparing a list of surface waters (e.g., water bodies and streams) not meeting water quality standards due to pollutants. To comply with 303(d), State and Regional Water Boards assess water quality monitoring data for Californias surface waters every two years to determine if they contain pollutants at levels that exceed protective water quality standards. Water body and pollutants that exceed protective water quality standards are considered impaired and are placed on the States 303(d).Source: Environmental Protection Agency
An index of the habitat value to threatened and endangered (under the Endangered Species Act) birds, mammals, reptiles, and amphibians. It combines threatened and endangered species richness measured by the overlap of species ranges and the suitability of the vegetation to support each of those species.Source: Custom TNC product (not available for download) Minimum Acreage Threshold: 100.0 acres
Land capability classification shows the suitability of soils for most kinds of field crops. The soils are grouped according to their limitations for field crops, the risk of damage if they are used for crops, and the way they respond to management.Source: USDA - Soil Survey Geographic Database
As part of the Conservation Lands Network (CLN), Bay Area streams were prioritized for conservation. All native fish species found in San Francisco Bay Area streams were selected as conservation targets, with the goal of maintaining healthy assemblages of native fishes. Priority 1 is existing steelhead and rearing habitat and current and historic coho habitat. Priority 2 is any healthy native fish populations. Learn more at www.bayarealands.org.Source: Bay Area Open Space Council, Conservation Lands Network Minimum Acreage Threshold: 10.6 acres
The areas where vegetation will not likely be stressed by climate change because the vegetation in those areas will likely experience climate conditions that are within the range of conditions they are currently found in in California.Source: Created by same method as in this report. Minimum Acreage Threshold: 100.0 acres
An index that indicates the presence and accessibility of microhabitat options by quantifying both the permeability of the landscape and the diversity in potential "wetness" and "heat" based on topography.Source: Custom TNC product (not available for download) Minimum Acreage Threshold: 100.0 acres
Highways and other major roads can bisect otherwise intact habitat linkages, creating barriers to wildlife movement. The Bay Area Open Space Council prepared a geographic database of such highway barriers throughout the Bay Area via visual analysis of aerial photography, maps of vegetation, and maps of habitat linkages.Source: Bay Area Open Space Council, Conservation Lands Network
This map shows recent unconsolidated sediments and the corresponding liquefaction susceptibility for the urban core of the San Francisco Bay region.Source: USGS
Development proposals and approved projects in a city or county entitlement process that lie outside of San Francisco Bay Area's contiguous urbanized lands. This also includes lands under speculative pressure, though no official planning proposal has been submitted to a jurisdiction's planning department. This includes projects and boundary expansions proposed in the last five years on open space but that have since been rescinded from the entitlement and planning process.Source: Greenbelt Alliance
Jurisdiction: Solano County Protection: The Orderly Growth Initiative focuses residential growth in the county's seven cities, rather than the unincorporated areas. Lands zoned for agriculture cannot change without a popular vote thereby supporting the County's economy and quality of life.
Some metrics reported by the GreenPrint application will be less accurate when measured over smaller areas. This is often a function of the dataset resolution as well as natural variation in the real-world conditions. When the reported area is below a certain acreage, some metrics may be suppressed so as not to give misleading results and/or the metric value may be supplemented with warnings. Metrics in this glossary will note minimum acreage thresholds where they apply.
Watersheds that supply water to a water utility.Source: The Nature Conservancy Minimum Acreage Threshold: 100.0 acres
The many types of tidally influenced natural habitats, such as mudflats and marshes, found at the interface of uplands and the bay estuary.Source: NOAA Coastal Change Analysis Program Minimum Acreage Threshold: 100.0 acres
The material contribution areas, the meander belts, the floodplains, and riparian wetlands of a river or stream. Naturalness of Active River Area are those parts of the Active River Area that are still in a natural or semi-natural condition and are assumed to contribute to healthy river/stream function and water-related ecosystem services.Source: California Integrated Assessment of Watershed Health (PDF report) Minimum Acreage Threshold: 100.0 acres
Jurisdiction: Half Moon Bay Protection: The city has designated portion of areas as open space reserve consistent with the policy of the Coastal Act; including areas currently in some form of agricultural use and areas not now in production. These areas will be converted to urban uses only after all other areas designated for urban development in the local coastal program and general plan have been substantially developed.
ParkServe® provides in-depth data to guide local park improvement efforts. This shows areas that are greater than a 10 minute walk from existing parks are graded on a mix of their population density, proportion of youth, and income characteristics.Source: The Trust for Public Land
The layer shows the air pollution exposure risk to particulate matter of 2.5 micrometers from mobile and stationary sources as identified in Plan Bay Area 2013. High risk areas show PM2.5 concentration greater than 0.8 μg/m3 which tend to occur along high traffic freeways and rail lines, locations with numerous stationary sources, and locations where a single stationary source has very high estimated PM2.5 risk.Source: Bay Area Air Quality Management District. Plan Bay Area Draft Environmental Impact Report, page 2-2.40 of the Air Quality section.
The layer shows the air pollution exposure risk to cancer causing emissions from mobile and stationary sources as identified in Plan Bay Area 2013. High risk areas show increased cancer risk is greater than 100 in a million which tend to occur along high traffic freeways and rail lines, locations with numerous stationary sources, and locations where a single stationary source has very high estimated cancer risk.Source: Bay Area Air Quality Management District. Plan Bay Area Draft Environmental Impact Report, page 2-2.40 of the Air Quality section. Last updated Aug. 30, 2018
Farmland with the best combination of physical and chemical features able to sustain long term agricultural production. This land has the soil quality, growing season, and moisture supply needed to produce sustained high yields. Land must have been used for irrigated agricultural production in the last four years.Source: Farmland Mapping and Monitoring Program, 2014 Minimum Acreage Threshold: 10.0 acres
Priority Development Areas represent areas local jurisdictions have identified, as part of the region's Sustainable Communities Strategy work, for new and/or intensified development.Source: MTC
California Statewide Groundwater Elevation Monitoring priority basins are determined by the California Department of Water Resources (CDWR) according to the following criteria: overlying population, projected growth of overlying population, public supply wells, total wells, overlying irrigated acreage, reliance on groundwater as the primary source of water, impacts on the groundwater; including overdraft, subsidence, saline intrusion, and other water quality degradation, and any other information determined to be relevant by CDWR.Source: California Department of Water Resources Minimum Acreage Threshold: 100.0 acres
Land that has a permanent limitation on development (i.e., conversion to intensive human uses). Permanent protection typically comes in the form of fee title ownership by a conservation or park entity (e.g. land trust, open space district, regional/state/federal park agency) or via a conservation easement. Examples of land protected by fee title ownership include dedicated parkland or nature preserves.Source: Bay Area Protected Areas Database, December 2016
Publicly accessible parks, preserves and trails, ranging in size from less than one acre to over 50,000 acres, and managed and maintained by the regions many local, regional, state, and federal agencies and organizations.Source: Bay Area Protected Areas Database, 2017
This shows the distribution of landslides evident in the landscape — most of which are slumps, translational slides, and earth flows — which is of interest both for evaluation of hazard and risk and for use in further study of landslides. Future movement of such landslides is most likely to occur within and around the places where they have previously occurred.Source: USGS
A wall-to-wall picture of regional habitat connectivity for plant and animal species whose movement is inhibited by developed or agricultural land uses.Source: Custom TNC product (not available for download)
These areas of channelized connectivity represent the last remaining natural habitat linkages through a region. A landscape of connected habitats is critical to the survival of wildlife and plants by enabling movement for daily activity and dispersal. In a changing climate, connectivity will become even more important to species survival by enabling species to move to more suitable habitat as needed.Source: Custom TNC product (not available for download) Minimum Acreage Threshold: 8.0 acres
These areas of diffuse connectivity contribute to regional connectivity as broad, unfragmented lands that allow wildlife and plants to move freely. A landscape of connected habitats is critical to the survival of wildlife and plants by enabling movement for daily activity and dispersal. In a changing climate, connectivity will become even more important to species survival by enabling species to move to more suitable habitat as needed.Source: Custom TNC product (not available for download) Minimum Acreage Threshold: 8.0 acres
These areas of intensified connectivity are natural lands that provide the few remaining options for natural habit linkages through a region. A landscape of connected habitats is critical to the survival of wildlife and plants by enabling movement for daily activity and dispersal. In a changing climate, connectivity will become even more important to species survival by enabling species to move to more suitable habitat as needed.Source: Custom TNC product (not available for download) Minimum Acreage Threshold: 8.0 acres
Regional trails and trail systems are designed to serve populations greater than one community, often connecting multiple communities. Regional trails can be paved or unpaved and are mostly off-street. The Bay Area is fortunate to have well over a thousand miles of regional trails. The two premier regional trails are the Bay Area Ridge Trail, which circles the San Francisco Bay along the mountain ridgelines, and the San Francisco Bay Trail, which encircles the Bay at the shoreline. Other regional trails include the California Coastal Trail, Juan Bautista de Anza National Historic Trail, Napa Valley Vine Trail, the West County Trail in Sonoma County, and the many hundreds of miles of paved off-street trails in Contra Costa County managed by East Bay Regional Park District. Trail completion is a priority of Bay Area conservation and recreation agencies and organizations and was also a focus of many Priority Conservation Areas submitted to the Association of Bay Area Governments in 2015.Source: Greenbelt Alliance
Of the given metric (e.g. acreage of baylands), the total amount of that same thing across the entire Bay Area, which is also protected by policies, fee ownership, or easements.
Of the given metric (e.g. acreage of baylands), the total amount of that same thing across the entire county, which is also protected by policies, fee ownership, or easements. This is only presented if the analyzed area fits entirely within one county.
Of a given metric (e.g. acreage which is protected by easement), the amount within your analyzed area constitutes a certain amount of that in the entire Bay Area. This is that proportion. For example, a 10% value for Baylands, would indicate that the Baylands in your analyzed area constitutes 10% of the Baylands in the entire Bay Area.
Of a given metric (e.g. acreage which is protected by easement), the amount within your analyzed area constitutes a certain amount of that in the entire county. This is that proportion. For example, a 10% value for Baylands, would indicate that the Baylands in your analyzed area constitutes 10% of the Baylands in the entire county. This field is only displayed if the analyzed area fits entirely within a single county.
Of a given metric (e.g. acreage which is protected by easement), the amount within your analyzed area constitutes a certain amount of that in the entire watershed. This is that proportion. For example, a 10% value for Baylands, would indicate that the Baylands in your analyzed area constitutes 10% of the Baylands in the entire watershed. This field is only displayed if the analyzed area fits entirely within a single watershed.
The metric being reported, e.g. Baylands.
The percentage of your analyzed area's acreage which fits into the given metric category. For example, a 12% for "Farmland of Local Importance" indicates that 12% of your area fits into that category. This is present only for acreage-based metrics.
Metrics reported by the analysis tool, are expressed in a variety of units: acreage, linear mileage, actual count, rating or score, and so on. The values represented should always be taken along with the units in which they are represented.
Surface water storage watersheds are identified by the combined volume of all reservoirs within their watershed system and measured according to the average reservoir storage volume.Source: Greenbelt Alliance Minimum Acreage Threshold: 100.0 acres
Jurisdiction: Solano County Protection: Varying 20, 50, 100, or 150 foot buffer from streams. An ordinance has to be developed that protects riparian water quality through proper buffer zones that keep riparian areas an appropriate width apart from one another depending upon the size of the developed land, respective buffer zones must be set.
Riparian policies limit or prohibit new construction within a certain buffered distance from rivers and streams to avoid adverse impacts of urban development.Source: Greenbelt Alliance
Water that flows over the surface of the land into streams and riversSource: USGS-BCM (Flint and Flint) Minimum Acreage Threshold: 633.0 acres
The risks of both hazards are expected to increase with climate change. To characterize these risks, a sea level rise scenario (50 cm of rise with a 100-year storm event) and a flooding scenario (a 500-year flood) were combined to form a single likely water-related hazard zone given expected climate change for the region.Source: USGS/Our Coast Our Future; NOAA CCAP, 2016
Global warming is melting polar ice which is causing the level of the sea to rise. Climate projections for the Bay Area over the next 80 years include possible sea level rise of five feet by the year 2100.Source: NOAA
This hazard layer is used to display the composite shaking hazard across the Bay Area based on all earthquake scenarios and probability information using the Modified Mercalli Intensity (MMI) scale. The layer shows likely shaking intensity in the Bay Area in any 50 year period from all possible faults.Source: USGS, ABAG
The carbon content in soil organic matter from microorganisms, root exudates, decomposed organisms, and soil biota. Soil organic carbon storage is summarized to a depth of 30cm.Source: USDA NRCS, version 1.1 2014
The tsunami hazard map is intended for local jurisdictional, coastal evacuation planning uses only. This map does not meet disclosure requirements for real estate transactions nor for any other regulatory purpose.Source: State of California
Farmland of lesser quality soils used for the production of the State's leading agricultural crops. This land is usually irrigated, but may include non-irrigated orchards or vineyards as found in some climatic zones in California. Land must have been cropped in the last four years.Source: Farmland Mapping and Monitoring Program, 2014 Minimum Acreage Threshold: 10.0 acres
The estimated amount of carbon (measured in Metric Tons of CO2 equivalent) stored in street trees in urban areas.Source: UC Davis Minimum Acreage Threshold: 500 acres Last updated June 18, 2015
A planning boundary of a city and/or county that defines where urban growth can and cannot occur. The strength of a boundary can be attributed to the body that approves the expansion of a UGB, as a vote of the people from an approved ballot measure or by the vote of a city council or board of county supervisors. These UGBs are mapped from current General Plan maps and Local Agency Formation Commission) documents.Source: At Risk 2017
Areas that may have hotter temperatures due to human land use. Heat island threat is higher in areas with more impervious surfaces (e.g. concrete, asphalt), less tree canopy cover, and higher air temperatures.Source: UC Davis Last updated June 18, 2015
The land surface temperature layer is from 2010 that combines land cover types from National Land Cover Database with thermal temperature from Landstat on developed lands to identify areas experiencing the urban heat island effect.Source: University of California, Berkeley. Mapping Climate Change Exposures, Vulnerabilities, and Adaptation to Public Health Risks, p.59-Fig 21., 2011-2012
A planning area regulated by each county's Local Agency Formation Commission that delineates where land is available for development and services. California Gov. Code Section 56080 describes it as "undeveloped, or agricultural land, either incorporated or unincorporated, within the sphere of influence of a city, which is served by urban facilities, utilities, and services."Source: Greenbelt Alliance
Vernal pools are seasonal depressional wetlands that are covered by shallow water for variable periods from winter to spring, but may be completely dry for most of the summer and fall. These wetlands range in size from small puddles to shallow lakes and are usually found in a gently sloping plain of grassland. The inventory in the Greenprint combines the knowledge of vernal pools and vernal pool complexes distributed across the Bay Area from local and federal agencies. Understanding the extent of these unique ecosystems is vital for the monitoring of and recovery planning for listed and sensitive species that are uniquely adapted to live in this environment.Source: SFEI Minimum Acreage Threshold: 40.0 acres
An index of water quality based on conductivity, turbidity, and nitrate concentration.Source: Based on data in this report Minimum Acreage Threshold: 100.0 acres
Watershed-zoned areas from county general plans and jurisdictional policies adopted to protect drinking and irrigation water watersheds from urban development. Policies include voter-protected agricultural watershed county lands in Napa County's Measure J, Solano County's Orderly Growth Initiative for marsh and watershed designated lands, and groundwater policies in Sonoma County.Source: Greenbelt Alliance
Topographic divides and delineated areas where surface-water runoff drains into a common surface-water body, such as a lake or section of a stream. It is important to consider that while watershed boundaries identify surface-water runoff divides, they often do not represent groundwater flow divides. Groundwater flows generally follow the topographic flow direction, just as surface water runoff does. However, the movement of water in the subsurface is more complex and groundwater flow directions may not coincide with surface water flow directions.Source: USGS Watershed Boundary Dataset, January 2013
The Water Trail is a network of launch and landing sites around the San Francisco Bay. The sites allow people in human-powered boats and beachable sail craft to take single-day and multiple-day trips on the Bay.Source: MTC, November 2011
Areas where water covers the soil, or is present either at or near the surface of the soil all year or for varying periods of time during the year, including during the growing season. Water saturation largely determines how the soil develops and the types of plant and animal communities living in and on the soil. Wetlands may support both aquatic and terrestrial species. The prolonged presence of water creates conditions that favor the growth of specially adapted plants and promote the development of characteristic wetland soils.Source: US Fish & Wildlife Service
A wildland–urban interface refers to the zone of transition between unoccupied land and human development, and likely including communities that are within 0.5 miles of the zone. These lands and communities adjacent to and surrounded by wildlands are at risk of wildfires.Source: CalFire
Jurisdiction: Alameda County, Contra Costa County, Marin County, Napa County, San Francisco, San Mateo County, Santa Clara County, Solano County, Sonoma County Protection: California law that provides relief of property tax to owners of farmland and open-space land in exchange for a ten-year agreement that the land will not be developed or otherwise converted to another use.
Williamson Act properties are enrolled in a California program providing property tax relief to owners of farmland and open space land in exchange for a ten-year agreement that the land will not be developed or otherwise converted to another use. The state payments to counties to support this program ceased in FY 2009, and so the decision to continue the program is being made on a county by county basis.Source: Greenbelt Alliance