Measuring surface-water loss in Honouliuli Stream near the ‘Ewa Shaft, O‘ahu, Hawai‘i

Abstract

For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment-visit http://www.usgs.gov or call 1-888-ASK-USGS.For an overview of USGS information products, including maps, imagery, and publications, visit http://store.usgs.gov.Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner. , and Glenn Agunat (Monsanto Company) for their help with gaining access to the study area. Michele Harman (HBWS) also supplied critical water-level data for the duration of the study from a groundwater-monitoring well in the study area. This study could not have been completed without the assistance of Rick Fontaine, Alan Mair, Chris Cummings, and Chiu Yeung. Finally, the author would like to thank Delwyn Oki for his support and guidance in project design and report preparation. State Well NumbersSince 1971, Hawaiʻi's well-numbering system has contained seven digits. The first digit distinguishes the island, which is then followed by a dash separator. The next four digits represent the grid system, with the first two digits representing minutes of latitude and the second two digits representing minutes of longitude for that grid (using leading zeroes for minute values less than 10). To distinguish wells within a minute grid, two digits were added following the 4-digit minutegrid numbers with a dash separator, and are sometimes referred to as a sequence number.In 2012, Hawaiʻi's well-numbering system was modified to accommodate more wells than the previous numbering system would allow. The sequence number was changed from two digits to three digits, allowing for a grid to have 100 or more wells. If the sequence number is less than 100, the new numbering system places a zero in front of the 2 digits. References to wells in this report will only use a two-digit sequence number when the sequence number is less than 100.

Exposure Pathways of Nontuberculous Mycobacteria Through Soil, Streams, and Groundwater, Hawai'i, USA

“…The (100 m × 10 μm) reference fracture may transmit water on time scales of a month (Figure 11) even if the entire fracture network were this narrow. These calculations are consistent with the empirical observations of Rosa (2017) and Shuler et al. (2019).…”

“…Estimated travel distances through a 20-30 m thick vadose zone, similar to coastal areas of Oahu, were 225 to 1000 m, similar to the transport lengths in the groundwater flow model. The analog studies of Rosa (2017) and Shuler et al (2019) demonstrate that connections between losing streams and the vadose zone to aquifers and water supply wells through fractured basalt can be rapid.…”

Glyphosate in Runoff From Urban, Mixed-Use and Agricultural Watersheds in Hawaii, Usa

“…This likely contributed to the elevated glyphosate concentration levels detected in these samples. By comparison, the HDOH [15] and Surfrider [16] studies measured lower glyphosate concentrations in Manoa Stream ranging from <0.075 to 0.272 µg/L (60% detection frequency).…”

“…Glyphosate and AMPA were detected in all seven co-located sediment samples at concentrations ranging from 6.8 to 1,100 and 7.5 to 1,200 µg/kg, respectively. The Surfrider Foundation conducted a multi-year water quality study evaluating the concentration of pesticides and herbicides in the nearshore marine environments on the islands of Oahu and Kauai [16]. A total of 59 water samples and 32 co-located sediment samples were collected between 2015 and 2017.…”

GEOLOGICAL AND GEOCHEMICAL CONTROLS ON NON-TUBERCULOUS MYCOBACTERIUM TRANSMISSION: EXAMPLES FROM HAWAII

“…The particles, however, originate at the water table versus the actual stream, which stream is 16 m to 30 m above the water table. Recent work has been performed near Honolulu to understand the groundwater response to stream discharge variability and there seems to be a rapid response (Rosa, 2017). Since there seems to be a rapid response, the following fracture flow hypothesis assumes that there is a saturated system between the stream and the water table.…”