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I have a floating-point raster of Curve Numbers (70-91) and I'm attempting to use the curve number equation to create a weight raster for flow accumulation, to determine runoff for a single rainfall event. I'm familiar with this curve number equation:

formula

where

Q = total runoff
P = preciptation (1 inch in this case)
0.2S = initial abstractions
0.8 = potential maximum retention after runoff begins

The 2 outside the first bracket means to the power of 2. Firstly, I am unsure how to calculate the power of 2 in the Raster Calculator. Also, would precipitation be an input raster or just a value (1 for example)?

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As commented by @KirkKuykendall:

To raise to the nth power, use the pow function, or sqr to square it.

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