Interests in private industry, government and academia have eagerly awaited the publication of new precipitation frequency estimates for Wisconsin as well as sixteen other Midwestern and southeastern states. Those estimates were recently published by the NWS Office of Hydrologic Development as Volumes 8 and 9 of NOAA Atlas 14, a web-based publication available at:
The Wisconsin precipitation frequency estimates are available directly at:
The last time that these estimates were updated was in 1963.
Precipitation frequency estimates are estimates of climate variability. They are used as design standards for civil infrastructure built to cope with rainfall and runoff such as storm water drainage systems, roads, bridges, culverts, small dams, roofs, airport runways, stream erosion control, pollution control systems, flood insurance rate maps, and soil conservation, just to name a few. These new estimates directly contribute to the preparation of more cost-effective designs, plans and maps for protecting life and property and preventing pollution.
NWS precipitation frequency estimates--prepared since the 1950s--are cited as design standards in many Federal, State and Local Government regulations. These new NOAA Atlas 14 volumes will result in new design criteria for a large range of engineering and planning projects.