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TitleWater balance - derived precipitation and evapotranspiration / Bilan hydrique - précipitation et évapotranspiration dérivées
DownloadDownloads
AuthorCanada Surveys and Mapping Branch
SourceHydrological Atlas of Canada 25, 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; hydrology; precipitation; evaporation; evapotranspiration
Abstract(unpublished)
The map shows isolines for the annual precipitation and the annual evapotranspiration (in millimetres). Water is normally supplied by precipitation and lost through the processes of evapotranspiration and runoff or it may remain as surface or subsurface storage. Over long periods, generally several years or more, changes in water storage for any particular region may be neglected, and the precipitation (P) is balanced by evapotranspiration (E) and runoff (N). The concept of a water balance was first introduced in the literature by Thornthwaite in 1944 as a means of calculating evapotranspiration. Since that time, the water balance concept has been used in a variety of ways; herein it is viewed conceptually by the following equation: P = N + E. In this form, the water balance equation can serve a dual purpose. It can provide estimates of any of the components P, N, or E as long as the other two are known, or it can serve as a check when each of the components has been measured independently. The der
GEOSCAN ID295299