Pioneer Canal and Laramie River by Tony Bergantino
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Wyoming Probable Maximum Precipitation Study
State of Wyoming

This study provides Probable Maximum Precipitation (PMP) values for any drainage basin within Wyoming, including regions adjacent to the State that provide runoff into drainage basins within Wyoming. The PMP values are valid for June 15 through September 15, which is the time of the year when the most intense rainfall could occur. A seasonality adjustment is provided to derive PMP values for dates outside of this time period. PMP values may be used in the computation of the Probable Maximum Flood (PMF). PMP values provided in this study supersede PMP values in the four Hydrometeorological Reports (HMRs) for locations in Wyoming, including HMR 49 (Hansen et al., 1977), HMR 51 (Schreiner and Riedel, 1978), HMR 55A (Hansen et al., 1988), and HMR 57 (Hansen et al., 1994).

Deliverables from the PMP Study Available for Download

PMP Final Report & Appendices
Digital Appendices
PMP Evaluation GIS Tool
Supporting PMP Documents

All final deliverables for the Wyoming Probable Maximum Precipitation Study are being provided herein with the expressed understanding that the Wyoming Water Development Office and State of Wyoming are releasing these products at the user's own risk. It is the "Engineer of Record" and/or end users who are expected to take all steps necessary to ensure proper use and understanding of these products and that all information is being interpreted and applied properly.

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