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Found 10 records similar to Depth, duration and frequency of point rainfall - 24-hour rainfall for 2-year, 5-year, 10 year and 25-year return periods

Federal

The plate contains four maps of 60 minute rainfalls (in millimetres) for a 2 year return period, a 5 year return period, a 10 year return period and a 25 year return period. Each map has a detailed inset of the Vancouver area. These four maps were not analyzed for the mountainous parts of Canada in British Columbia and the Yukon because of the limited number of stations, the non-representative nature of the valley stations and the variability of precipitation owing to the orographic effects. From the incomplete data, it is impossible to draw accurate isolines of short duration rainfall amounts on maps of national scale.

Last Updated: Feb. 22, 2022
Date Published: Jan. 1, 1978
Organization: Natural Resources Canada
Formats: PDF JPG
Keywords:  climate, hydrology, precipitation, water balance
Federal

The plate contains four maps of 10 minute rainfalls (in millimetres) for a 2 year return period, a 5 year return period, a 10 year return period and a 25 year return period. Each map has a detailed inset of the Vancouver area. These four maps were not analyzed for the mountainous parts of Canada in British Columbia and the Yukon because of the limited number of stations, the non-representative nature of the valley stations and the variability of precipitation owing to the orographic effects. From the incomplete data, it is impossible to draw accurate isolines of short duration rainfall amounts on maps of national scale.

Last Updated: Feb. 22, 2022
Date Published: Jan. 1, 1978
Organization: Natural Resources Canada
Formats: PDF JPG
Keywords:  climate, hydrology, precipitation, water balance
Federal

The plate contains four maps. The first map shows the location of recording rain gauges used in the map and their number of years of record. The three other maps show the ratio 6-hour/24-hour rainfall extremes, the ratio 48-hour/24-hour rainfall extremes and the ratio 72-hour/24-hour rainfall extremes. Ratios of 6-hour/24-hour rainfall vary from less than 0.5 to above 0.8, the lowest being over coastal areas that are more affected by travelling low pressure systems, and the highest over the Prairies and Southern Ontario where convective activity and intense thunderstorms of short duration predominate.

Last Updated: Feb. 22, 2022
Date Published: Jan. 1, 1978
Organization: Natural Resources Canada
Formats: PDF JPG
Keywords:  climate, hydrology, precipitation, water balance
Federal

Precipitation is derived from water vapour in the air, and it includes all forms of moisture falling on the earth's surface. Condensed water vapour accumulates in clouds, and precipitation occurs when the constituent ice crystals or water droplets grow too large to resist gravitational attraction to earth. The atmospheric moisture lost through precipitation is replenished by transpiration from vegetation, and by evaporation from the soil and from water bodies. The oceans, which cover 71 per cent of the earth's surface, are the primary source, though large fresh water bodies may be important locally, particularly in more southern latitudes.

Last Updated: Feb. 22, 2022
Date Published: Jan. 1, 1978
Organization: Natural Resources Canada
Formats: PDF JPG
Keywords:  climate, hydrology, precipitation, water balance
Provincial

100 year peak flow isolines in cubic metres per second (m3/s) for 100 square kilometre watersheds and 100 year return period

Last Updated: Dec. 10, 2020
Date Published: Oct. 12, 2011
Organization: Government of British Columbia
Formats: KML WMS HTML
Keywords:  hydrology, isoline, peak flow, stream flow, Government information
Provincial

10 year peak flow isolines in cubic metres per second (m3/s) for 100 square kilometre watersheds and 10 year return period

Last Updated: Dec. 10, 2020
Date Published: Mar. 9, 2011
Organization: Government of British Columbia
Formats: KML WMS HTML
Keywords:  hydrology, isoline, peak flow, stream flow, Government information
Federal

This dataset contains adjusted daily rainfall (R) and snowfall (S) data from all Canadian stations reporting rainfall and snowfall for which we have metadata to do the adjustments. The processing includes inspection and adjustment using quality control procedures customized for producing gridded datasets, including: (1) conversion of snowfalls to their water equivalents; (2) corrections for gauge undercatch and evaporation due to wind effect, for gauge specific wetting loss, and for trace precipitation amount (same as in Mekis and Vincent, 2011); (3) treatment of flags (e.g. accumulation flags). A total of 2146 stations were processed; their record lengths vary from 3 to167 years.

Last Updated: Jul. 30, 2021
Date Published: Apr. 14, 2017
Organization: Environment and Climate Change Canada
Formats: HTML
Keywords:  rainfall, snowfall, climate change, Canada
Federal

Short-duration rainfall intensity-duration-frequency IDF statistics in the form of tables and graphs with accompanying documentation for 549 locations across Canada. These files can be downloaded for each province territory or for all of Canada.

Last Updated: Sep. 13, 2021
Date Published: Jan. 28, 2015
Organization: Environment and Climate Change Canada
Formats: HTML
Keywords:  rainfall, climate
Federal

The map shows the annual runoff in millimetres. Annual runoff varies from year to year owing to variations in precipitation, evaporation, and natural storage. The map presents the long-term average of these annual variations. The annual runoff is smallest in southern Saskatchewan and southeastern Alberta with values lower than 25 millimetres.

Last Updated: Feb. 23, 2022
Date Published: Jan. 1, 1978
Organization: Natural Resources Canada
Formats: PDF JPG
Keywords:  hydrology, runoff, streamflow
Federal

The map shows the mean total precipitation in the month of April. April is a transitional month across much of southern Canada, when snow is still possible but rainfall begins to dominate the precipitation regime. Precipitation amounts across the southern interior of Canada are somewhat greater than those in January, as air temperatures warm in response to the increasing strength and duration of sunshine. Rainfall amounts onshore along British Columbia’s west coast are still in the range of 200 to 300 millimetres, somewhat less than the values in January.

Last Updated: Mar. 14, 2022
Date Published: Dec. 31, 2010
Organization: Natural Resources Canada
Formats: JP2 other ZIP
Keywords:  environment, map, precipitation
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