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TitleDepth, duration, and frequency of point rainfall - ratios of 6-hour, 48-hour, and 72-hour rainfall to 24-hour extremes; location of recording rain gauges used in the analyses / Hauteur, durée et fréquence des précipitations ponctuelles - rapports des valeurs de 6, 48 et 72 heures aux valeurs extrêmes de 24 heures; emplacement des pluviomètres enregistreurs employés dans les analyses
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AuthorCanada Surveys and Mapping Branch
SourceHydrological Atlas of Canada 7, 1978, 1 sheet
Year1978
PublisherCanada Surveys and Mapping Branch
Documentserial
Lang.English; French
Maps1 map
Map Info.hydrographic, 1:10,000,000
ProjectionLambert Conformal Conic Projection
Mediapaper; on-line; digital
File formatpdf; jpg
ProvinceBritish Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut
NTS1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65; 66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560
Lat/Long WENS-141.0000 -50.0000 90.0000 41.7500
Subjectshydrogeology; environmental geology; environmental geology; hydrology; precipitation; climate
Abstract(unpublished)
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. The isolines of the 48-hour/24-hour rainfall ratio show less spatial variation than the other ratios, varying from 1.1 to 1.4. Generally the lowest values are in eastern Canada. The other rainfall ratio chart, 72-hour/24-hour, is very similar to the 48-hour/24-hour chart. The highest ratios above 1.6 are confined to the coastal mountains of British Columbia and along the eastern shore of Baffin Island
GEOSCAN ID295279