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Hanawi Stream near Nahiku, Maui, Hawaii.

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DATA CENTER

Recent hydrologic conditions, Hawaii

A summary of recent rainfall, streamflow, and groundwater conditions in Hawaii is provided below. These web pages are prepared in collaboration with the Hawaii State Commission on Water Resource Management and the County Water Departments and provide water-resource managers, scientists, and the public with timely information on the status and trends of hydrologic conditions in Hawaii.

RAINFALL

Kauai--Below-average rainfall. During September - November 2014, rainfall was about 70 percent of average. As of November 2014, rainfall near the summit of Mt. Waialeale on Kauai was below average 11 of the last 12 months. During December 2013 - November 2014, rainfall was about 69 percent of average.

Oahu--Below-average rainfall. During September - November 2014, rainfall was about 90 percent of average. As of November 2014, rainfall at Poamoho, near the crest of the Koolau Range on Oahu, was above average 6 of the last 12 months. During December 2013 - November 2014, rainfall was about 112 percent of average.

Maui--Below-average rainfall. October - November 2014, rainfall was about 50 percent of average. Rainfall data are missing for part of August and September due to equipment malfunction. As of November 2014, rainfall at Puu Kukui, the summit of the West Maui Mountains was below average 8 of the last 10 months with complete rainfall records. Three months of rainfall data are missing during the previous year due to equipment malfunction.

Link to Drought Monitor from NOAA, USDA, and the National Drought Mitigation Center and Standardized Precipitation Index from NWS Honolulu Forecast Office, both include rainfall data from Hawaii.

STREAMFLOW

Links to USGS WaterWatch for current streamflow conditions in Hawaii. Links open in a new browser window.

  • Real-time streamflow map-- tracks short-term changes (over several hours) in rivers and streams. Although the general appearance of the map changes very little from one hour to the next, individual sites may change rapidly in response to major rain events or to reservoir releases.
  • Daily streamflow map-- shows average streamflow conditions for the previous day. The map is similar in appearance to the "Real-time streamflow map" but less likely to reflect the influence of short-term events such as reservoir releases and short-duration precipitation events.
  • Monthly average streamflow map-- shows the average streamflow conditions for the past month. By averaging over past month, the values on the map are more indicative of longer-term streamflow conditions than either the "Real-time streamflow" or the "Daily streamflow" maps.
  • Flood and high flow map-- shows the location of streamgages where the water level is currently at or above flood stage (depicted as a black triangle) or at high flow (depicted as blue circles). The high flow conditions are expressed as percentiles that compare the current (i.e., within the past several hours) instantaneous flow value to historical daily mean flow values for all days of the year.
  • Drought flow map-- shows the location of streamgages where the water level is currently below normal 7-day average streamflow. The low flow conditions are expressed as percentiles that compare the recent flow value to historical daily mean flow values.
  • Streamflow duration hydrographs-- compare recent streamflow record with historical data for active stream gages.

GROUNDWATER LEVELS

Information from the USGS on groundwater and drought.

Links to USGS Groundwater Watch for current water-level conditions in Hawaii. Links open in a new browser window.

Water level network map-- shows recent groundwater levels compared to historical monthly mean groundwater levels. A list of wells in the network and links to available data and statistics are provided below by County

In addition to the USGS streamflow, groundwater level, and rainfall data for the sites shown above, the National Weather Service, Weather Forecast Office in Honolulu provides rainfall hydrology data and graphics for Hawaii.

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URL: http://hi.water.usgs.gov/recent/hawaii/index.html
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Page Last Modified: Monday, 01-Dec-2014 13:52:14 EST