Codes, Standards and Related Instruments (CSRI) - Vulnerability ...

Annual Rain2005 Based on data from 1961-19902010 Not updated, same as 2005Moisture Index2005 Compiled from the wetting index (annual rain) and drying index. The wetting indexis based on 1961-1990. The drying index is based on 1980-19992010 Not updated, same as 2005Annual Total Precipitation (rainfall + snowfall water equivalent)2005 Based on data from 1961-19902010 Not updated, same as 2005Driving Rain Wind Pressures2005 Based on approximately 1953-19852010 Not updated, same as 2005Snow Loads2005 Based on 1955-1987. Values in the 2005 NBCC were adjusted upwards by 10% toreflect the change from a 30-year to 50-year return period2010 Not updated, same as 2005Wind Pressures2005 Based on approximately 1936-1958. A limited review and some revisions were madebased on the period approximately 1953-1990. Values were adjusted upwards by10% to reflect the change from a 30-year to 50-year return period2010 Updated based on the period 1953-2007Structural CommentariesTornado Prone Areas – Commentary I - Wind Load and Effects2010 New Tornado Prone Area Map based on 1980-2009Freezing Index – Commentary J - Foundations2005 Average freezing index map based on 1931-19602010 Updated average freezing index map based on 1978-2007 and new 100-year returnperiod freezing index map based on 1958-2007· Was the update (by data type) the result of an analysis of new Environment Canada field data, or theapplication of general assumptions (e.g., increasing snow loading by x% in certain areas) by the CodeCentre or Environment Canada?FINAL REPORT Page 19 of 22PIEVC CSRI Water Review