For weathering and drift corrections, especially in areas where the low-velocity material is very thick, the Blondeau method, as modified by Swartz, has proved to be not only advantageous, but the only accurate method under certain conditions.This paper presents a new procedure for applying the Blondeau-Swartz method to the single-layer case which achieves considerable time saving, elimination of the potential sources of errors, increased accuracy, and a final answer, or reduction value, which is rapidly checked for correctness.An example of the use of the rapid method is presented. The constants in this example are characteristic of the glacial-drift problem in Central Alberta.

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