Skip to main content
Advanced Search

Filters: Tags: Frequency (X)

3 results (23ms)   

View Results as: JSON ATOM CSV
thumbnail
In large river ecosystems, the timing, extent, duration and frequency of floodplain inundation greatly affect the quality of fish and wildlife habitat and the supply of important ecosystem goods and services. Seasonal high flows provide connectivity from the river to the floodplain, and seasonal inundation of the floodplain governs ecosystem structure and function. River regulation and other forms of hydrologic alteration have altered the connectivity of many rivers with their adjacent floodplain – impacting the function of wetlands on the floodplain and in turn, impacting the mainstem river function. Conservation and management of remaining floodplain resources can be improved through a better understanding of...
Long-term, non-contact river velocity measurements have been made using a UHF RiverSonde system for several months at each of two locations having quite different flow characteristics. Observations were made on the Cowlitz River at Castle Rock, Washington from October 2003 to June 2004, where the unidirectional flow of the river ranged from about 1.0 to 3.5 m/s. The radar velocity was highly correlated with the stage height which was continually measured by the U. S. Geological Survey. The profile of the along-channel velocity across the water channel also compared favorably with in-situ measurements performed by the Survey. The RiverSonde was moved to Threemile Slough, in central California, in September 2004 and...
thumbnail
These GIS grids were produced from NOAA and NRCC precipitation frequency estimates for North America based on precipitation data collected from 1816 to 2014. The grids provide estimated rainfall data for 2-, 5-, 10-, 25-, 50-, 100-, 20-0, and 500-year recurrence periods for a 24-hour duration. Grid value units are inches * 1000.
    map background search result map search result map GCPO Inundation Frequency Mosaic (2017) The frequency of extreme rainfall intensities over a 24-hour duration The frequency of extreme rainfall intensities over a 24-hour duration GCPO Inundation Frequency Mosaic (2017)