20260428
14303300
1.0
ISO19139
Precipitation_Percent_Recharge
-230315.843750
-180095.843750
17536.687500
96916.687500
1
Projected
GCS_North_American_1983
Linear Unit: Meter (1.000000)
NAD_1983_California_Teale_Albers
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<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>A dataset representing the percent of precipitation contributing to recharge was developed for Napa County using output from the U.S. Geological Survey’s Basin Characterization Model ( USGS BCM)(Flint et al., 2021). The BCM is a grid-based, regional water balance software package developed and maintained by the USGS and is widely applied throughout California as a foundational tool for water resource planning, climate change vulnerability assessments, and sustainable groundwater management. The model simulates physical processes in performing water-balance calculations across a high-resolution rectangular grid system with a square cell size of approximately 270 meters by 270 meters. While the published version of BCM utilizes input datasets for underlying geology derived from generalized regional geologic mapping data, to improve the representation of geologic conditions in the model, inputs relating to the underlying geology in the BCM were updated using local geologic data consistent with the surficial geology used in the California Department of Water Resources approved 2022 Napa Valley Subbasin Groundwater Sustainability Plan (GSP). Simulated annual recharge output on a cell-by-cell basis from the adjusted BCM for a 10-year period spanning water years (WY) 2012 through 2021, were used to calculate the average percentage of annual precipitation that contributes to groundwater recharge.</SPAN></SPAN></P><P /></DIV></DIV></DIV>
Precipitation_Percent_Recharge
2026-07-28T00:00:00
2026-07-28T00:00:00
Michael Snyder
Luhdorff & Scalmanini Consulting Engineers
Senior GIS Analyst
msnyder@lsce.com
500 First Street
Woodland
CA
95695
US
(530) 661-0109
Napa County
-122.54
-122.10
38.86
38.15
2012-10-01T00:00:00
2022-09-30T00:00:00
Michael Snyder
Luhdorff & Scalmanini Consulting Engineers
Senior GIS Analyst
msnyder@lsce.com
500 First Street
Woodland
CA
95695
US
(530) 661-0109
Napa
PBES
BDR
Groundwater
Hydrology
Precipitation
California
County
A dataset representing the percent of precipitation contributing to recharge.
LSCE, 2026;California Department of Water Resources; U.S.G.S
<p>This layer is open data. It is made available under the Public Domain Dedication and License version v1.0 whose full text can be found at:</p><p></p><p>https://opendatacommons.org/licenses/pddl/1.0/</p><p></p><p>Disclaimer: This GIS data is intended to provide a visual display of data for the user's convenience. Users of this data are hereby notified that the appropriate public primary information sources should be consulted for verification of the information. Although every reasonable effort has been made to assure the accuracy of this data, Napa County makes no warranty, representation or guaranty as to the content, sequence, accuracy, timeliness or completeness of any of the data provided herein and explicitly disclaims any representations and warranties, including, without limitation, the implied warranties of merchantability and fitness for a particular purpose. Napa County assumes no liability for any errors, omissions, or inaccuracies in the information provided regardless of how caused and assumes no liability for any decisions made or actions taken or not taken by the user of the data in reliance upon any information or data furnished hereunder. Because the GIS data provided is not warranted to be up-to-date, the user should check with the County staff for updated information.</p>
Esri ArcGIS 13.5.5.57366
1
-122.657104
-122.058060
38.870475
38.145361
20260810
Michael Snyder
Luhdorff & Scalmanini Consulting Engineers
Senior GIS Analyst
msnyder@lsce.com
500 First Street
Woodland
CA
95695
US
(530) 661-0109
Michael Snyder
For information on dataset lineage and geoprocessing refer to Napa County Water Availability Analysis Recharge Methodology Technical Memorandum (2026) or contact Luhdorff & Scalmanini Consulting Engineers.
Enterprise Geodatabase Raster Dataset
dataset
EPSG
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Pixel
294
186
270.000000
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FALSE
LZ77
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pixel codes
SDR
TRUE
row and column
270.000000
270.000000