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Service Description: <div style='text-align:Left;'><div><div><p><span style='font-size:12pt'>This layer provides rainfall depths in inches for the 10 and 100 recurrence interval over a range of durations from 15-minutes to 48-hours to be used when performing hydrological calculations within the unincorporated parts of Marin County, and possibly in incorporated areas where specifically approved by the City or Town. These values were statistically derived using precipitation gages across the entire San Francisco Bay Area by Met-Stat for Valley Water (2016) as an alternative to the values presented in NOAA Atlas 14. Analysis by Valley Water for the South Bay as well as by Wood Rodgers in 2025 for Marin County showed runoff from calibrated hydrologic models better matched historical flow frequencies using Met-Stat depths than NOAA Atlas 14 depths. Note that it is likely the Met Stat values will be replaced by the newer NOAA Atlas 15 values when publicly released in 2028 (estimated date by NOAA) per NOAA (https://water.noaa.gov/about/atlas15). Users of this data should always check the webpage for the latest information on updates to Marin County hydrology.</span></p></div></div></div>
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Has Versioned Data: false
MaxRecordCount: 2000
Supported Query Formats: JSON
Supports Query Data Elements: true
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Description: This layer provides rainfall depths in inches for the 10 and 100 recurrence interval over a range of durations from 15-minutes to 48-hours to be used when performing hydrological calculations within the unincorporated parts of Marin County, and possibly in incorporated areas where specifically approved by the City or Town. These values were statistically derived using precipitation gages across the entire San Francisco Bay Area by Met-Stat for Valley Water (2016) as an alternative to the values presented in NOAA Atlas 14. Analysis by Valley Water for the South Bay as well as by Wood Rodgers in 2025 for Marin County showed runoff from calibrated hydrologic models better matched historical flow frequencies using Met-Stat depths than NOAA Atlas 14 depths. Note that it is likely the Met Stat values will be replaced by the newer NOAA Atlas 15 values when publicly released in 2028 (estimated date by NOAA) per NOAA (https://water.noaa.gov/about/atlas15). Users of this data should always check the webpage for the latest information on updates to Marin County hydrology.
Service Item Id: 2263ae9159ce4a9f90cc68a86d6b206f
Copyright Text: Data provided courtesy of Valley Water for San Francisco Bay.
Spatial Reference:
2872
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Initial Extent:
XMin: 5760451.21716112
YMin: 2110193.5217056647
XMax: 6079726.047882318
YMax: 2326764.560726337
Spatial Reference: 2872
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LatestVCSWkid(0)
Full Extent:
XMin: 5831621.760086402
YMin: 2120037.659842968
XMax: 6008555.504957035
YMax: 2316920.422589034
Spatial Reference: 2872
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LatestVCSWkid(0)
Units: esriFeet
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Title: Map
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Keywords: Environment,Climate and Weather,Water - Inland,Polygon
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