Brian A. Ebel 20191231 .csv files Reston, VA U.S. Geological Survey https://doi.org/10.5066/P9U26SS0 This data release presents measurements and derived parameters for attributes of bulk density, loss on ignition, soil-water retention, and hydraulic conductivity for a site (Richardson) near Hess Creek in interior Alaska, USA. These measurements are useful for hydrologic modeling and predictions of water availability in this region. This data release presents measurements and derived parameters for attributes of bulk density, loss on ignition, soil-water retention, and hydraulic conductivity for a site (Richardson) near Hess Creek in interior Alaska, USA. These measurements are useful for hydrologic modeling and predictions of water availability in this region. 20180625 20180625 ground condition Complete None planned -149.0902000 -149.0901000 65.6554000 65.6553000 USGS Thesaurus wildfire hydraulic properties soil properties interior Alaska USGS Metadata Identifier USGS:5cfedbcde4b0156ea5645114 Geographic Names Information System Alaska Hess Creek Dalton Highway none none Brian Ebel U.S. Geological Survey mailing and physical

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Lakewood CO 80225 USA 303-236-3977 bebel@usgs.gov Windows 10, Python 3.7, Microsoft Excel 2016 No formal attribute accuracy tests were conducted The data matches up with details provided. Values fall within expected ranges for the soil textural class at a given site. Data have been checked for duplication and omission. No formal logical accuracy tests were conducted on geospatial data. Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. SC denotes no data at that location because the split was compromised.. No formal positional accuracy tests were conducted No formal positional accuracy tests were conducted The sampling site was termed the "Richardson" site, near Hess Creek in interior Alaska. Samples were collected on June 25, 2018.From 0-5 cm depth was fibric organic matererial, from 5-12 cm depth was humic organic material, and below 12 cm depth was mineral soil. Frost probe refusal depth at the sampling site was 50-56 cm. Samples were collected at 25 cm depth in mineral soil that had gelisol characteristics. At the 25 cm depth, a bench of soil was excavated and soil cores were taken. Four soil samples were collected by driving in metal soil coring devices perpendicular to the ground surface and then excavating the intact core. Cores were 4.8 cm inner diameter and 6 cm long. Measurements taken include field-saturated hydraulic conductivity, soil-water retention, loss on ignition, and dry bulk density. Samples were taken from the location N 65.65538 degrees and west 149.09015 degrees World Geodetic System 1984 datum (WGS84). Field saturated hydraulic conductivity (Kfs) was measured by using a tension permeameter (Mini Disc portable tension infiltrometer, Decagon Devices) at -0.5 cm pressure. The term field-saturated denotes that conditions were nearly saturated, which is typical of flow conditions in the field because of entrapped air (Reynolds et al., 1983). The permeameter was coupled to the cores in the laboratory using a flexible plastic sleeve and several mm of moist contact sand between the soil sample and the permeameter base. The contact sand enhances hydraulic contact between the permeameter and the sample (e.g. Nyman et al., 2010). Samples were placed into a stand with a plastic screen secured to the core base, this facilitates free drainage of water from the base of the core. The lateral confinement of the soil core by the impermeable steel walls allows use of the 1 dimensional (vertical) flow equations from Philip (1957,1969) describing cumulative infiltration with time. Cumulative infiltration with time was analyzed using the method from Vandervaere et al. (2000) . Following the Kfs measurements, the soil cores were split into 0-3 cm (A samples) and 3-6 cm sections (B samples). The 0-3 cm sections were analyzed for soil-water retention by immersion saturation followed by drying using the hanging column method (Klute, 1986), the pressure plate method (Dane and Hopmans, 2002), and the dewpoint potentiameter method (Gee et al., 1992). Soil-water retention data were used to estimate van Genuchten (1980) parameters using the software RETC (van Genuchten et al., 1991) for the functional relation representing soil-water retention. Following the soil -water retention measurements, the 0-3 cm (A samples) and 3-6 cm sections (B samples) were analyzed for loss on ignition and dry bulk density. Loss on ignition (LOI) measurements to estimate organic matter content (Dean, 1974; Heiri et al., 2001) were conducted at 550°C for 2 h. The loss on ignition is a percentage mass lost during heating. Dry bulk density was estimated using the core method. Oven dry sample mass (48 hours at 60 °C) was divided by the sample volume. References: Dane, J. H., and J. W.Hopmans (2002), Pressure plate extractor, in Methods of Soil Analysis, part 4: Physical Methods, Soil Science Society of America Book Series No. 5, edited by J. H.Dane and G. C.Topp, pp. 688–690, Soil Sci. Soc. of America, Madison, Wis. Dean, W. E., Jr. (1974), Determination of carbonate and organic matter in calcareous sediments and sedimentary rocks by loss on ignition: Comparison with other methods, J. Sed. Petrol., 44, 242–248. Gee, G. W., M. D.Campbell, G. S.Campbell, and J. H.Campbell (1992), Rapid measurement of low soil water potentials using a water activity meter, Soil Sci. Soc. Am. J., 56, 1068–1070. Heiri, O., A. F.Lotter, and G.Lemcke (2001), Loss on ignition as a method for estimating organic and carbonate content in sediments: Reproducibility and comparability of results, J. Paleolimnol., 25, 101–110. Klute, A. 1986. Water retention: Laboratory Methods, in Methods of Soil Analysis, Part 1, Physical and Mineralogical Methods, Soil Science Society of America, Madison, WI, p. 635-662. Nyman, P., Sheridan, G., & Lane, P. N. (2010). Synergistic effects of water repellency and macropore flow on the hydraulic conductivity of a burned forest soil, south‐east Australia. Hydrological Processes, 24(20), 2871-2887. Philip, J. R. (1957), The theory of infiltration: 4. Sorptivity and algebraic infiltration equations, Soil Science, 84, 257-264. Philip JR (1969) ‘Theory of Infiltration.’ Advances in Hydroscience, Vol. 5, pp. 215–296. (Academic: San Diego, CA) Reynolds, W.D., Elrick, D.E., Topp, G.C., 1983. A re-examination of the constant head well permeameter method for measuring saturated hydraulic conductivity above the water table, Soil Sci. 136 (4), p. 250. Vandervaere JP, Vauclin M, Elrick DA (2000) Transient flow from tension infiltrometers: I. The two-parameter equation. Soil Science Society of America Journal 64, 1263–1272. van Genuchten, M. T. (1980), A closed-form equation for predicting the hydraulic conductivity of unsaturated soil, Soil Sci. Soc. Am. J., 44, 892–898. van Genuchten, M. T., F. J.Leij, and S. R.Yates (1991), The RETC code for quantifying the hydraulic functions of unsaturated soils, Rep. EPA/600/2091/065, Robert S. Kerr Environ. Res. Lab., Off. of Res. and Dev., U.S. Environmental Protection Agency, Ada, Oklahoma. 20191231 None Point Transverse Mercator 0.9996 0.0 0.0 500000.0 1.0E7 coordinate pair 0.1 0.1 meters RichardsonLOI_datarelease.csv Comma Separated Value (CSV) file containing data. Producer Defined Site Site name Producer Defined Richardson1 Site name Producer defined Richardson2 Site name Producer defined Richardson3 Site name Producer defined Richardson4 Site name Producer defined Core split (cm) 6-cm cores were split into 0--3 cm and 3--6 cm sections Producer Defined 0--3 0--3 cm section Producer defined 3--6 3--6 cm section Producer defined Loss on ignition(%) Loss on ignition (percentage, %, mass lost) Producer Defined 3.3 5.1 percentage,%, of mass lost This data release presents measurements and derived parameters for attributes of bulk density, loss on ignition, soil-water retention, and hydraulic conductivity for a site (Richardson) near Hess Creek in interior Alaska, USA. These measurements are useful for hydrologic modeling and predictions of water availability in this region. Ebel, B.A. (2019) Soil-water retention, hydraulic conductivity, bulk density, and loss on ignition near Hess Creek in interior Alaska: U.S. Geological Survey Data Release. https://doi.org/10.5066/P9U26SS0 U.S. Geological Survey - ScienceBase mailing and physical

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Denver CO 80225 USA 1-888-275-8747 sciencebase@usgs.gov Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein. Digital Data https://doi.org/10.5066/P9U26SS0 None Data are provided as .csv (comma separated) text files. The user must have software capable of opening the machine readable .csv files. 20200818 Brian Ebel U.S. Geological Survey mailing and physical

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Lakewood CO 80225 USA 303-236-3977 bebel@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998