20260603
16222600
1.0
FALSE
MARIN_HYDROLOGY_FLOOD_RAINFALL_DEPTH_10YR_100YR_temp
002
Projected
GCS_North_American_1983_HARN
Linear Unit: Foot_US (0.304801)
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NAD_1983_HARN_StatePlane_California_III_FIPS_0403_Feet
20260603
16232700
20260603
16232700
150000000
5000
FGDC
Esri ArcGIS 13.6.3.59530
Marin County Rainfall Depths for 10 and 100 Recurrence Interval Rainfall Depths for 15-Minutes to 48-Hours based on Bay Area Precipitation Data
This layer provides spatially dependent rainfall depths in inches for the 10- and 100-year recurrence intervals of durations ranging between 15 minutes and 48 hours and is typically used in flood studies for Marin County. The data is provided in a 1.5 by 1.9 km gird, expanding across the entire County, allowing for depths to be queried using geographic coordinates
<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>
Environment
Climate and Weather
Water - Inland
Polygon
Data provided courtesy of Valley Water for San Francisco Bay.
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN STYLE="font-size:12pt">County of Marin makes no representation or warranties, express or implied, with respect to the use or reuse of the data provided herewith, regardless of its format or the means of its transmission. THE DATA IS PROVIDED 'AS IS' WITH NO GUARANTEE OR REPRESENTATION ABOUT THE ACCURACY, CURRENCY, SUITABILITY, PERFORMANCE, MERCHANTABILITY, RELIABILITY, OR FITNESS OF THE DATA FOR ANY PARTICULAR PURPOSE. Most data, especially parcels and administrative boundaries, are not survey precise. County of Marin shall not be liable for any direct, indirect, special, incidental, compensatory or consequential damages or third-party claims resulting from the use of this data, even if County of Marin has been advised of the possibility of such potential loss or damage. This data may not be used in states that do not allow the exclusion or limitation of incidental or consequential damages.</SPAN></P></DIV></DIV></DIV>
Roger Leventhal
County of Marin
roger.leventhal@marincoiunty.gov
Roger Leventhal
Data does not have an update schedule. This dataset will likely be replaced by the revised national rainfall dataset currently in development by the NOAA under their Atlas 15 program.
Enterprise Geodatabase Feature Class
dataset
EPSG
6.3(9.0.0)
0
Simple
FALSE
0
TRUE
FALSE
MARIN_HYDROLOGY_FLOOD_RAINFALL_DEPTH_10YR_100YR_temp
Feature Class
0
OBJECTID
OBJECTID
OID
4
10
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Cell_ID
Cell_ID
String
255
0
0
Unique ID of the polygon cell
Marin_010YR_15MIN
Marin_010YR_15MIN
Double
8
38
8
10-year, 15-minute depth in inches
Marin_010YR_30MIN
Marin_010YR_30MIN
Double
8
38
8
10-year, 30-minute depth in inches
Marin_010YR_1HR
Marin_010YR_1HR
Double
8
38
8
Marin_010YR_2HR
Marin_010YR_2HR
Double
8
38
8
Marin_010YR_3HR
Marin_010YR_3HR
Double
8
38
8
Marin_010YR_6HR
Marin_010YR_6HR
Double
8
38
8
Marin_010YR_12HR
Marin_010YR_12HR
Double
8
38
8
Marin_010YR_24HR
Marin_010YR_24HR
Double
8
38
8
Marin_010YR_48HR
Marin_010YR_48HR
Double
8
38
8
Marin_100YR_15MIN
Marin_100YR_15MIN
Double
8
38
8
Marin_100YR_30MIN
Marin_100YR_30MIN
Double
8
38
8
Marin_100YR_1HR
Marin_100YR_1HR
Double
8
38
8
Marin_100YR_2HR
Marin_100YR_2HR
Double
8
38
8
Marin_100YR_3HR
Marin_100YR_3HR
Double
8
38
8
Marin_100YR_6HR
Marin_100YR_6HR
Double
8
38
8
Marin_100YR_12HR
Marin_100YR_12HR
Double
8
38
8
Marin_100YR_24HR
Marin_100YR_24HR
Double
8
38
8
Marin_100YR_48HR
Marin_100YR_48HR
Double
8
38
8
Shape
Shape
Geometry
8
0
0
Feature geometry.
Esri
Coordinates defining the features.
Shape.STArea()
Shape.STArea()
Double
0
0
0
Shape.STLength()
Shape.STLength()
Double
0
0
0
20260603
Data does not have an update schedule. This dataset will likely be replaced by the revised national rainfall dataset currently in development by the NOAA under their Atlas 15 program.
Roger Leventhal
County of Marin
roger.leventhal@marincoiunty.gov
False
0
False
0
False
0