Summary of soil field-saturated hydraulic conductivity, hydrophobicity, preferential-flow, and particle-size measurements collected at four research sites on the island of Maui, Hawaii, September 2017-August 2018

The U.S. Geological Survey and the University of Hawaii at Manoa, in cooperation with the County of Maui Department of Water Supply and the State of Hawaii Commission on Water Resource Management, initiated a field data-collection program to provide information for evaluating how infiltration rates and soil hydrophobicity are dependent on plant species type within forested areas on the island of Maui. The field data collection is part of a study to quantify the impacts of high-priority non-native and dominant native plant species on freshwater availability throughout the State of Hawaii (https://archive.usgs.gov/archive/sites/hi.water.usgs.gov/studies/maui_e…). The overall objective of the study is to provide needed information for (1) assessing species-specific impacts on freshwater availability and (2) reducing uncertainty in regional recharge estimates associated with forested areas. This dataset includes a summary of measurements of soil field-saturated hydraulic conductivity, hydrophobicity, and preferential flow collected at four study sites on the island of Maui, Hawaii between September 2017 and August 2018. The dataset also includes a summary of soil particle-size analyses made on a subset of soil samples collected from the four sites. This data release includes four files: a summary file, two results files, and a metadata file: The summary file [Maui_P1A_summary_file.pdf] includes a table and map of the study sites, oblique areal imagery of the measurement plots at each study site, and a schematic of the measurement location configuration for each plot. The infiltration data file [Maui_P1A_infiltration_data.csv] contains attributes that describe the study site, dominant vegetation, measurement date, measurement location identification code, and measurement results of soil field-saturated hydraulic conductivity, hydrophobicity, and preferential flow for all 226 individual measurement locations. The particle size data file [Maui_P1A_soil_particle_size_data.csv] contains all laboratory soil particle-size results for a total of 45 soil samples collected from a subset of individual measurement locations. The metadata file [Maui_P1A_infiltration_particle_size_data_release_metadata.xml] includes explanation of the contents of the two data files and detailed descriptions of the methods used for each measurement. Measurements were made at four different study sites on the island of Maui: Waikamoi, Maluhia, Kahoma and Waikahi (see table 1 and figure 1 in summary file). Each study site is located in forested land and consisted of one or more plots dominated by a high-priority non-native species and an adjacent or nearby plot dominated by native species.