Los Angeles County GIS Data Portal » Hydro http://egis3.lacounty.gov/dataportal GIS Data for LA County Thu, 23 May 2013 22:29:47 +0000 en-US hourly 1 California Spatial Information Library (CaSIL) http://egis3.lacounty.gov/dataportal/2011/11/22/california-spatial-information-library-casil/?utm_source=rss&utm_medium=rss&utm_campaign=california-spatial-information-library-casil http://egis3.lacounty.gov/dataportal/2011/11/22/california-spatial-information-library-casil/#comments Tue, 22 Nov 2011 18:09:29 +0000 Roman http://egis3.lacounty.gov/dataportal/?p=2543 The Cal-Atlas site facilitates the coordinated and sustainable development, maintenance, licensing and sharing of geospatial data and web map services by California government agencies, partners and stakeholders. California government agencies work with the California GIS Council, regional GIS collaboratives and the broader California GIS community to define the data architecture, systems, standards, agreements and processes [...]]]> The Cal-Atlas site facilitates the coordinated and sustainable development, maintenance, licensing and sharing of geospatial data and web map services by California government agencies, partners and stakeholders. California government agencies work with the California GIS Council, regional GIS collaboratives and the broader California GIS community to define the data architecture, systems, standards, agreements and processes for a fully integrated and effective California Spatial Data Infrastructure.

The link below is for downloadable GIS data found at the Cal-Atlas Geospatial Clearinghouse.

http://www.atlas.ca.gov/download.html#/casil

]]> http://egis3.lacounty.gov/dataportal/2011/11/22/california-spatial-information-library-casil/feed/ 0 Watershed Boundaries http://egis3.lacounty.gov/dataportal/2011/05/09/watershed-boundaries/?utm_source=rss&utm_medium=rss&utm_campaign=watershed-boundaries http://egis3.lacounty.gov/dataportal/2011/05/09/watershed-boundaries/#comments Tue, 10 May 2011 00:15:15 +0000 Mark Greninger http://egis3.lacounty.gov/dataportal/?p=1988 This dataset contains watershed boundaries for watersheds covering Los Angeles County.

This dataset was downloaded, extracted and prepared from the National Hydrography Dataset. The NHD is a comprehensive effort by the US Geological Survey to manage and maintain a comprehensive, high quality, nationwide dataset for GIS mapping and analysis of water features and [...]]]> This dataset contains watershed boundaries for watersheds covering Los Angeles County.

This dataset was downloaded, extracted and prepared from the National Hydrography Dataset.  The NHD is a comprehensive effort by the US Geological Survey to manage and maintain a comprehensive, high quality, nationwide dataset for GIS mapping and analysis of water features and conveyance.  While it is not perfect, and you may find a number of errors, LA County applauds this effort, and is determined to support the enhancement and maintenance of this valuable information since it supports our long-term goal of public, authoritative data.  We are currently investigating the feasibility of stewarding the NHD data for the LA County region.

A description of the NHD from the USGS site:

The National Hydrography Dataset (NHD) is the surface water component of The National Map. The NHD is a digital vector dataset used by geographic information systems (GIS). It contains features such as lakes, ponds, streams, rivers, canals, dams and streamgages. These data are designed to be used in general mapping and in the analysis of surface-water systems.

Samples

Please note that the symbology on the attached maps (and the layers within the downloads) are those developed by the County in order to highlight various hydrographic features.  They are not final in any way.  These sample images contain symbology for all of the NHD layers, since we are making the data available as a single download.

Click a thumbnail to expand

Legend

Countywide

Mid-zoom

Zoomed

Watersheds

Watershed(2)

Processing steps

This data was downloaded from the NHD Data Viewer portal: http://viewer.nationalmap.gov/viewer/nhd.html?p=nhd.

  1. I selected the data covering the County of Los Angeles and retrieved the data in personal geodatabase format (I have link to download that file below).
  2. To prepare the shapefiles that are available for download, I have joined the features to their descriptions in the NHDFCODE table through the FCODE field and exported them, since a direct export from the geodatabase will not include the related information.  To ensure consistency, I have not deleted any fields that have been created through this join.
  3. Symbols were created using the Description Field.

Data Downloads

Each of the datasets below contain the following data:

The extracted file includes the following shapefiles:

  • Hydro Points – nhd_points_withcodes.shp
  • Hydro Lines - nhd_flowline_withcodes.shp
  • Hydro Polygons - nhd_waterbody_withcodes.shp
  • Watershed Boundaries (Levels 8,10, & 12)

It also includes a number of ArcMap 10 layer files that reference the data, and an ArcMap 10 .mxd file as well.

]]> http://egis3.lacounty.gov/dataportal/2011/05/09/watershed-boundaries/feed/ 0 32.731804796023 -117.2103720903432.731804796023-117.21037209034 Hydrologic Points http://egis3.lacounty.gov/dataportal/2011/05/09/hydrologic-points/?utm_source=rss&utm_medium=rss&utm_campaign=hydrologic-points http://egis3.lacounty.gov/dataportal/2011/05/09/hydrologic-points/#comments Tue, 10 May 2011 00:14:25 +0000 Mark Greninger http://egis3.lacounty.gov/dataportal/?p=1987 This dataset contains hydologic points (gaging stations, gates, rock features, springs, water intakes, wells, waterfalls, reservoir points) in LA County.

This dataset was downloaded, extracted and prepared from the National Hydrography Dataset. The NHD is a comprehensive effort by the US Geological Survey to manage and maintain a comprehensive, high quality, nationwide dataset [...]]]> This dataset contains hydologic points (gaging stations, gates, rock features, springs, water intakes, wells, waterfalls, reservoir points) in LA County.

This dataset was downloaded, extracted and prepared from the National Hydrography Dataset.  The NHD is a comprehensive effort by the US Geological Survey to manage and maintain a comprehensive, high quality, nationwide dataset for GIS mapping and analysis of water features and conveyance.  While it is not perfect, and you may find a number of errors, LA County applauds this effort, and is determined to support the enhancement and maintenance of this valuable information since it supports our long-term goal of public, authoritative data.  We are currently investigating the feasibility of stewarding the NHD data for the LA County region.

A description of the NHD from the USGS site:

The National Hydrography Dataset (NHD) is the surface water component of The National Map. The NHD is a digital vector dataset used by geographic information systems (GIS). It contains features such as lakes, ponds, streams, rivers, canals, dams and streamgages. These data are designed to be used in general mapping and in the analysis of surface-water systems.

Samples

Please note that the symbology on the attached maps (and the layers within the downloads) are those developed by the County in order to highlight various hydrographic features.  They are not final in any way.  These sample images contain symbology for all of the NHD layers, since we are making the data available as a single download.

Click a thumbnail to expand

Legend

Countywide

Mid-zoom

Zoomed

Watersheds

Watershed(2)

Processing steps

This data was downloaded from the NHD Data Viewer portal: http://viewer.nationalmap.gov/viewer/nhd.html?p=nhd.

  1. I selected the data covering the County of Los Angeles and retrieved the data in personal geodatabase format (I have link to download that file below).
  2. To prepare the shapefiles that are available for download, I have joined the features to their descriptions in the NHDFCODE table through the FCODE field and exported them, since a direct export from the geodatabase will not include the related information.  To ensure consistency, I have not deleted any fields that have been created through this join.
  3. Symbols were created using the Description Field.

Data Downloads

Each of the datasets below contain the following data:

The extracted file includes the following shapefiles:

  • Hydro Points – nhd_points_withcodes.shp
  • Hydro Lines - nhd_flowline_withcodes.shp
  • Hydro Polygons - nhd_waterbody_withcodes.shp
  • Watershed Boundaries (Levels 8,10, & 12)

It also includes a number of ArcMap 10 layer files that reference the data, and an ArcMap 10 .mxd file as well.

]]> http://egis3.lacounty.gov/dataportal/2011/05/09/hydrologic-points/feed/ 0 32.731800283417 -117.2103345394132.731800283417-117.21033453941 Lakes & Reservoirs http://egis3.lacounty.gov/dataportal/2011/05/09/lakes-reservoirs/?utm_source=rss&utm_medium=rss&utm_campaign=lakes-reservoirs http://egis3.lacounty.gov/dataportal/2011/05/09/lakes-reservoirs/#comments Tue, 10 May 2011 00:14:01 +0000 Mark Greninger http://egis3.lacounty.gov/dataportal/?p=1986 This dataset contains lakes & reservoirs in LA County.

This dataset was downloaded, extracted and prepared from the National Hydrography Dataset. The NHD is a comprehensive effort by the US Geological Survey to manage and maintain a comprehensive, high quality, nationwide dataset for GIS mapping and analysis of water features and conveyance. While [...]]]> This dataset contains lakes & reservoirs in LA County.

This dataset was downloaded, extracted and prepared from the National Hydrography Dataset.  The NHD is a comprehensive effort by the US Geological Survey to manage and maintain a comprehensive, high quality, nationwide dataset for GIS mapping and analysis of water features and conveyance.  While it is not perfect, and you may find a number of errors, LA County applauds this effort, and is determined to support the enhancement and maintenance of this valuable information since it supports our long-term goal of public, authoritative data.  We are currently investigating the feasibility of stewarding the NHD data for the LA County region.

A description of the NHD from the USGS site:

The National Hydrography Dataset (NHD) is the surface water component of The National Map. The NHD is a digital vector dataset used by geographic information systems (GIS). It contains features such as lakes, ponds, streams, rivers, canals, dams and streamgages. These data are designed to be used in general mapping and in the analysis of surface-water systems.

Samples

Please note that the symbology on the attached maps (and the layers within the downloads) are those developed by the County in order to highlight various hydrographic features.  They are not final in any way.  These sample images contain symbology for all of the NHD layers, since we are making the data available as a single download.

Click a thumbnail to expand

Legend

Countywide

Mid-zoom

Zoomed

Watersheds

Watershed(2)

Processing steps

This data was downloaded from the NHD Data Viewer portal: http://viewer.nationalmap.gov/viewer/nhd.html?p=nhd.

  1. I selected the data covering the County of Los Angeles and retrieved the data in personal geodatabase format (I have link to download that file below).
  2. To prepare the shapefiles that are available for download, I have joined the features to their descriptions in the NHDFCODE table through the FCODE field and exported them, since a direct export from the geodatabase will not include the related information.  To ensure consistency, I have not deleted any fields that have been created through this join.
  3. Symbols were created using the Description Field.

Data Downloads

Each of the datasets below contain the following data:

The extracted file includes the following shapefiles:

  • Hydro Points – nhd_points_withcodes.shp
  • Hydro Lines - nhd_flowline_withcodes.shp
  • Hydro Polygons - nhd_waterbody_withcodes.shp
  • Watershed Boundaries (Levels 8,10, & 12)

It also includes a number of ArcMap 10 layer files that reference the data, and an ArcMap 10 .mxd file as well.

]]> http://egis3.lacounty.gov/dataportal/2011/05/09/lakes-reservoirs/feed/ 0 32.73167844296 -117.210479378732.73167844296-117.2104793787 Rivers, Streams, Water Conveyance (pipelines, aqueducts) http://egis3.lacounty.gov/dataportal/2011/05/09/rivers-streams-water-conveyance-pipelines-aqueducts/?utm_source=rss&utm_medium=rss&utm_campaign=rivers-streams-water-conveyance-pipelines-aqueducts http://egis3.lacounty.gov/dataportal/2011/05/09/rivers-streams-water-conveyance-pipelines-aqueducts/#comments Tue, 10 May 2011 00:13:03 +0000 Mark Greninger http://egis3.lacounty.gov/dataportal/?p=1972 This dataset contains rivers, streams, and water conveyance mechanisms (pipelines, aqueducts).

This dataset was downloaded, extracted and prepared from the National Hydrography Dataset. The NHD is a comprehensive effort by the US Geological Survey to manage and maintain a comprehensive, high quality, nationwide dataset for GIS mapping and analysis of water features and [...]]]> This dataset contains rivers, streams, and water conveyance mechanisms (pipelines, aqueducts).

This dataset was downloaded, extracted and prepared from the National Hydrography Dataset.  The NHD is a comprehensive effort by the US Geological Survey to manage and maintain a comprehensive, high quality, nationwide dataset for GIS mapping and analysis of water features and conveyance.  While it is not perfect, and you may find a number of errors, LA County applauds this effort, and is determined to support the enhancement and maintenance of this valuable information since it supports our long-term goal of public, authoritative data.  We are currently investigating the feasibility of stewarding the NHD data for the LA County region.

A description of the NHD from the USGS site:

The National Hydrography Dataset (NHD) is the surface water component of The National Map. The NHD is a digital vector dataset used by geographic information systems (GIS). It contains features such as lakes, ponds, streams, rivers, canals, dams and streamgages. These data are designed to be used in general mapping and in the analysis of surface-water systems.

Samples

Please note that the symbology on the attached maps (and the layers within the downloads) are those developed by the County in order to highlight various hydrographic features.  They are not final in any way.  These sample images contain symbology for all of the NHD layers, since we are making the data available as a single download.

Click a thumbnail to expand

Legend

Countywide

Mid-zoom

Zoomed

Processing steps

This data was downloaded from the NHD Data Viewer portal: http://viewer.nationalmap.gov/viewer/nhd.html?p=nhd.

  1. I selected the data covering the County of Los Angeles and retrieved the data in personal geodatabase format (I have link to download that file below).
  2. To prepare the shapefiles that are available for download, I have joined the features to their descriptions in the NHDFCODE table through the FCODE field and exported them, since a direct export from the geodatabase will not include the related information.  To ensure consistency, I have not deleted any fields that have been created through this join.
  3. Symbols were created using the Description Field.

Data Downloads

Each of the datasets below contain the following data:

The extracted file includes the following shapefiles:

  • Hydro Points – nhd_points_withcodes.shp
  • Hydro Lines - nhd_flowline_withcodes.shp
  • Hydro Polygons - nhd_waterbody_withcodes.shp
  • Watershed Boundaries (Levels 8,10, & 12)

It also includes a number of ArcMap 10 layer files that reference the data, and an ArcMap 10 .mxd file as well.

]]> http://egis3.lacounty.gov/dataportal/2011/05/09/rivers-streams-water-conveyance-pipelines-aqueducts/feed/ 0 32.731777720382 -117.210420370132.731777720382-117.2104203701 Debris Potential Areas http://egis3.lacounty.gov/dataportal/2011/01/27/debris-potential-areas/?utm_source=rss&utm_medium=rss&utm_campaign=debris-potential-areas http://egis3.lacounty.gov/dataportal/2011/01/27/debris-potential-areas/#comments Thu, 27 Jan 2011 23:58:02 +0000 cchen http://egis3.lacounty.gov/dataportal/?p=1176
Abstract:
Los Angeles Basin, Santa Clara River Basin, and Antelope Valley are divided into zones that yield similar volumes of sediment under similar conditions. These are called Debris Potential Area (DPA) zones. Sediment production from a watershed is a rate at which sediment passes a particular point, usually expressed as cubic yards per square mile per storm. The sediment production is dependent upon many factors such as: rainfall intensity, geology, soil type, vegetative coverage, runoff, and watershed slope.

 

Purpose:
For determining watershed sediment production. 
 
Supplemental Information:
Data was scanned and digitized from Los Angeles County Department of Public Works ‘s Hydrology/ Sedimentation Manual. 
]]> http://egis3.lacounty.gov/dataportal/2011/01/27/debris-potential-areas/feed/ 0 34.084921 -118.15013834.084921-118.150138 Seawater Barriers http://egis3.lacounty.gov/dataportal/2011/01/27/seawater-barriers/?utm_source=rss&utm_medium=rss&utm_campaign=seawater-barriers http://egis3.lacounty.gov/dataportal/2011/01/27/seawater-barriers/#comments Thu, 27 Jan 2011 23:58:02 +0000 cchen http://egis3.lacounty.gov/dataportal/?p=1180
Abstract:
The Los Angeles County Department of Public Works operates and maintains three seawater barriers along Los Angeles County’s coastline. Often unnoticed because of their underground nature, these facilities serve as Los Angeles basin’s fresh water sentinels. They protect a significant portion of the area’s drinking water supply from ocean water, which constantly attempts to migrate into existing aquifers. Treated imported and reclaimed water is injected deep into the underground aquifers to block this inland migration of saltwater.
 
Purpose:
General mapping use 
Supplemental Information:
View http://ladpw.org/wrd/Barriers/index.cfm for additional information
]]> http://egis3.lacounty.gov/dataportal/2011/01/27/seawater-barriers/feed/ 0 34.084921 -118.15013834.084921-118.150138 Ground Water Basins http://egis3.lacounty.gov/dataportal/2011/01/27/ground-water-basins/?utm_source=rss&utm_medium=rss&utm_campaign=ground-water-basins http://egis3.lacounty.gov/dataportal/2011/01/27/ground-water-basins/#comments Thu, 27 Jan 2011 23:57:41 +0000 cchen http://egis3.lacounty.gov/dataportal/?p=1201
Abstract:
This represents the groundwater basins and sub-basins as defined by the California Department of Water Resources. Groundwater basins are designated on the basis of geological and hydrological conditions, these usually being the occurrence of alluvial or unconsolidated deposits. When practical, large basins are also subdivided by political boundaries, as in the Central Valley. Basins are named and numbered per the convention of the Department of Water Resources.
 
Purpose:
To provide information about groundwater basins for public use
 
Supplemental Information:
Groundwater basins are replenished by the Spreading Grounds (http://ladpw.org/wrd/spreadingground/information); California Department of Water Resources data can be found at http://casil.ucdavis.edu/casil/gis.ca.gov/teale/grdwatba/
 
]]> http://egis3.lacounty.gov/dataportal/2011/01/27/ground-water-basins/feed/ 0 34.084921 -118.15013834.084921-118.150138 Direction of flow within Sub Watersheds http://egis3.lacounty.gov/dataportal/2011/01/27/direction-of-flow-within-sub-watersheds/?utm_source=rss&utm_medium=rss&utm_campaign=direction-of-flow-within-sub-watersheds http://egis3.lacounty.gov/dataportal/2011/01/27/direction-of-flow-within-sub-watersheds/#comments Thu, 27 Jan 2011 23:57:40 +0000 cchen http://egis3.lacounty.gov/dataportal/?p=1221 Data can be downloaded here ]]>
Abstract:
Direction of water flow between sub watersheds (or watershed sub basins).
 
 
]]> http://egis3.lacounty.gov/dataportal/2011/01/27/direction-of-flow-within-sub-watersheds/feed/ 0 34.084921 -118.15013834.084921-118.150138 Sanitary Sewers Maintained by the Los Angeles County Sewer Maintenance Districts (SMD) http://egis3.lacounty.gov/dataportal/2011/01/27/sanitary-sewers-maintained-by-the-los-angeles-county-sewer-maintenance-districts-smd/?utm_source=rss&utm_medium=rss&utm_campaign=sanitary-sewers-maintained-by-the-los-angeles-county-sewer-maintenance-districts-smd http://egis3.lacounty.gov/dataportal/2011/01/27/sanitary-sewers-maintained-by-the-los-angeles-county-sewer-maintenance-districts-smd/#comments Thu, 27 Jan 2011 23:56:49 +0000 cchen http://egis3.lacounty.gov/dataportal/?p=1243
Abstract:
Sanitary Sewers Maintained by the Los Angeles County Sewer Maintenance Districts (SMD).
 
Purpose:
Identifies sanitary sewers (gravity sewers, siphons and force mains) maintained by the Department of Public Works.
Supplemental Information:
The Los Angeles County Department of Public Works operates two special districts for the purpose of maintaining sanitary sewers: The Marina del Rey Sewer Maintenance District serves Marina del Rey. The Consolidated Sewer Maintenance District currently covers much of the sewered unincorporated county areas, 40 incorporated member cities, and serves two contract cities. Copies of record plans for sewers in unincorporated county areas and the following cities are available at the Survey Public Counter of the Los Angeles County Public Works Tidemanson Building (HQ), located at 900 South Fremont Avenue, Alhambra, CA 91803. Carson La Mirada Lomita Commerce Lakewood Temple City Copies of record plans for sewers in the following cities need to be obtained from the appropriate City Engineer: Agoura Hills Hidden Hills Pico Rivera Artesia Industry Rancho Palos Verdes Baldwin Park Irwindale Rolling Hills Bell Gardens La Canada-Flintridge Rolling Hlls Estates Bellflower La Habra Heights Rosemead Bradbury La Puente San Dimas Calabasas Lancaster Santa Clarita Cudahy Lawndale Santa Fe Springs Diamond Bar Malibu South El Monte Duarte Palmdale Walnut Glendora Palos Verdes Estates West Hollywood Hawaiian Gardens Paramount Westlake Village Information regarding trunk sewers can be obtained from: Sean Christian Sanitation Districts of Los Angeles County 1955 Workman Mill Road, Whittier, CA 90601 (562) 699-7411 http://www.lacsd.org Mike Brown Las Virgenes Municipal Water District 4232 Las Virgenes Road, Calabasas, CA 91302 (818) 251-2129 http://www.lvmwd.dst.ca.us
 
]]> http://egis3.lacounty.gov/dataportal/2011/01/27/sanitary-sewers-maintained-by-the-los-angeles-county-sewer-maintenance-districts-smd/feed/ 2 34.084921 -118.15013834.084921-118.150138 Sewers not maintained by Los Angeles County http://egis3.lacounty.gov/dataportal/2011/01/27/sewers-not-maintained-by-los-angeles-county/?utm_source=rss&utm_medium=rss&utm_campaign=sewers-not-maintained-by-los-angeles-county http://egis3.lacounty.gov/dataportal/2011/01/27/sewers-not-maintained-by-los-angeles-county/#comments Thu, 27 Jan 2011 23:56:49 +0000 cchen http://egis3.lacounty.gov/dataportal/?p=1245 Data can be downloaded here [...]]]>
Abstract:
City Sanitary and Private Sewers not Maintained by LA County.
 
Purpose:
To identify nearby private and city sanitary sewers that county sewer crews do not maintain
 
]]> http://egis3.lacounty.gov/dataportal/2011/01/27/sewers-not-maintained-by-los-angeles-county/feed/ 0 34.084921 -118.15013834.084921-118.150138 Storm Drain Names http://egis3.lacounty.gov/dataportal/2011/01/27/storm-drain-names/?utm_source=rss&utm_medium=rss&utm_campaign=storm-drain-names http://egis3.lacounty.gov/dataportal/2011/01/27/storm-drain-names/#comments Thu, 27 Jan 2011 23:56:48 +0000 cchen http://egis3.lacounty.gov/dataportal/?p=1255 Data can be downloaded here ]]>
Abstract:
Annotation for the Storm Drains.
Purpose:
To be used with the storm drains line work.
]]> http://egis3.lacounty.gov/dataportal/2011/01/27/storm-drain-names/feed/ 1 34.084921 -118.15013834.084921-118.150138