20230403
13575800
1.0
TRUE
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The 85th percentile is a 24-hour rainfall total. It represents a value such that 85% of the observed 24-hour rainfall totals will be less that that value.</SPAN></P><P><SPAN>These isolines were approximated by an empirical constant times the average annual rainfall. The average annual rainfall isolines were converted to a grid surface, multiplied by a factor of 0.09, and the new grid was exported to isolines. The resulting isoline layer is the existing 85th percentile isopluvial. </SPAN><SPAN>TOPOGRID command to generate a grid surface from the 2yr 24hr contours from the NOAA rainfall atlas.</SPAN></P><P><SPAN /></P></DIV></DIV></DIV>
County Hydrology Manual
isopluvials
isolines
rainfall
rainfall totals
24-hour
85th percentile
The 85th percentile isopluvial is used for determining the size of certain stormwater facilities, as specified in the County's Hydrology Manual.
Fred McCamic, County of San Diego, Department of Public Works, Cartographic Services. Rand Allan, County of San Diego, Department of Public Works, Flood Control Engineering.
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>THIS MAP/DATA IS PROVIDED WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Note: This product may contain information from the SANDAG Regional Information System which cannot be reproduced without the written permission of SANDAG. This product may contain information reproduced with permission granted by Rand McNally & Company® to SanGIS. This map is copyrighted by Rand McNally & Company®. It is unlawful to copy or reproduce all or any part thereof, whether for personal use or resale, without the prior, written permission of Rand McNally & Company®. Copyright SanGIS 2011 - All Rights Reserved. Full text of this legal notice can be found at:http://www.sangis.org/Legal_Notice.htm</SPAN></P></DIV></DIV></DIV>
85th Percentile Isopluvials
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