Pierre River Mine Project

WATER AENV SIRS 15 – 43
Section 12.1
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Request 22c Explain why only one estimate or calculation of AET (314 mm) was used to
represent both sides of the Athabasca River, given that Pierre River (with 374
mm precipitation annually) differs appreciably (by 59 mm) from Jackpine (433
mm). Different precipitation regimes can also be manifested in variations among
other climate characteristics including those that may play a role in the
calculation or estimation of AET; such parameters can include differences in
cloud covers and insolation, vapour pressure deficits, and boundary layer
conditions. Provide an explanation that addresses this particular concern
related to AET determination.
April 2010 Shell Canada Limited 12-25
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