FNR 66 Lecture 19

• Don’t forget to review two discussions!!! I have only received a few assignments. Don’t wait until the last minute.

• Flood Hazard Lab, woot woot, just in time for the rainy season

GIS UPDATES? A MOMENT OF SILENCE WHILE YOU COLLECT YOUR THOUGHTS

http://www.fema.gov/media-library/assets/documents/15477?id=3574

http://pinalcountyaz.gov/DEPARTMENTS/PUBLICWORKS/FLOODCONTROLDISTRICT/FLOODPLAIN/Pages/FloodplainTerms.aspx

What is a Base Flood Elevation (BFE)?Base Flood Elevations are the high water marks for the 100 yr flood. This is the means by which we set the home’s lowest floor or bottom of frame if it is a manufactured home in order to give it maximum protection from flooding. This number is a limiting factor for floodplain building—do not go below the BFE. The Regulatory Flood Elevation, or RFE is one foot above the BFE to further protect from flooding.

Recurrence interval, in years

Probability of occurrence in any given year

Percent chance of occurrence in any given

year

100 1 in 100 1

50 1 in 50 2

25 1 in 25 4

10 1 in 10 10

5 1 in 5 20

2 1 in 2 50

Recurrence intervals and probabilities of occurences

http://en.wikipedia.org/wiki/100-year_flood

http://water.usgs.gov/edu/100yearflood.html

http://pubs.usgs.gov/gip/106/

http://parra.sdsu.edu/roberson_chapter09.html

http://www.accurate-technologies.com/land/fema-flood-elevations-and-surveys.php

USGS General Information Product 106

LeDoux-Bloom, Cynthia and Downie, S.T. 2008 Outlet Creek Basin Assessment Report. Coastal Watershed Planning and Assessment Program, p. 191. California Department of Fish & Game, Sacramento, California.

https://msc.fema.gov/webapp/wcs/stores/servlet/StoreCatalogDisplay?storeId=10001&catalogId=10001&

https://hazards.fema.gov/femaportal/NFHL/