| Title | Depth, 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 |
| Download | Downloads |
| Author | Canada Surveys and Mapping Branch |
| Source | Hydrological Atlas of Canada 7, 1978, 1 sheet |
| Year | 1978 |
| Publisher | Canada Surveys and Mapping Branch |
| Document | serial |
| Lang. | English; French |
| Maps | 1 map |
| Map Info. | hydrographic, 1:10,000,000 |
| Projection | Lambert Conformal Conic Projection |
| Media | paper; on-line; digital |
| File format | pdf; jpg |
| Province | British Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut |
| NTS | 1; 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 |
| Subjects | hydrogeology; 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| Abstract | (unpublished)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 ID | 295279 |
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