Download the full-sized PDF of Estimate of the maximum probable precipitation for Alberta river basinsDownload the full-sized PDF



Permanent link (DOI):


Export to: EndNote  |  Zotero  |  Mendeley


This file is in the following communities:

Oil Sands Research and Information Network (OSRIN)


This file is in the following collections:

Government of Alberta Reports

Estimate of the maximum probable precipitation for Alberta river basins Open Access


Author or creator
Verschuren, J. P.
Wojtiw, L.
Additional contributors
River Basins
Probable Maximum Precipitation
Type of item
Canada, Alberta
Point measurements of maximum depth showed that over 50% of the rainstorms occur in June and July, with only a small percentage in Apri1 (5.6) and September (10. 1). The greatest frequency of occurrence is observed in the Waterton Lakes Park area (just about 1 per year), with relatively high frequencies along the continental divide and decreasing eastward along the foothills and plains of Alberta. Point measurements of maximum depth also showed that the greatest frequencies of occurrences are those in the Waterton Lakes Park area with probability of 2.0 (twice a year) for depths 50 mm and more; 0.38 (1:3 year event) for depths 100 mm and more; and 0.09 (1 :10 year event) for depths 150 mm and more. Seasonally the greatest frequencies are observed in June for southern Alberta and in July for central Alberta. Severe storms (150 mm and greater in depth) are observed to occur in four main regions of the province. Estimates of \"Probable Maximum Precipitation\" (PMP) using the meteorological approach were made for six river basins for 6-, 12-, 24-, 48-, 72-, 96-hour rainfalls. The maximum estimates of the PMP seem to occur in June for the basins in the southern portion of the province, while in central and northern Alberta the maximum estimates were found to occur in July. Spatial variability of the PMP is also observed in each of the river basins. The largest decrease of the maximum PMP is recorded in the South Saskatchewan River basin. Here at the eastern edges of the basin, the PMP estimates are about 80% lower than those calculated at the western edges. A second method of estimating the PMP, using the statistical technique developed by Hershfield, was also applied to 27 first-order stations. These estimates were about 50 mm higher (for areas of about 250 km2) in the six river basins. The largest estimates by this technique were also obtained in the South Saskatchewan River basin.
Date created
License information
This material is provided under educational reproduction permissions included in Alberta Environment and Sustainable Resource Development's Copyright and Disclosure Statement, see terms at This Statement requires the following identification: \"The source of the materials is Alberta Environment and Sustainable Resource Development The use of these materials by the end user is done without any affiliation with or endorsement by the Government of Alberta. Reliance upon the end user's use of these materials is at the risk of the end user.
Citation for previous publication

Link to related item

File Details

Date Uploaded
Date Modified
Audit Status
Audits have not yet been run on this file.
File format: pdf (PDF/X)
Mime type: application/pdf
File size: 12644499
Last modified: 2015:10:12 10:54:56-06:00
Filename: Verschuren 1980.pdf
Original checksum: 089e27fe2fe05a86057efd247162b95f
Activity of users you follow
User Activity Date