Download or read book Variability of Hydraulic Conductivity in Two Subsurface Horizons of Two Silt Loam Soils written by Fred G. Baker and published by . This book was released on 1975* with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Variability of Hydraulic Conductivity in Silt Loam Soils and Soil Morphological Characteristics that Relate to Soil Moisture Regime written by Fred G. Baker and published by . This book was released on 1975 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book EPA 600 2 written by and published by . This book was released on 1978 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Variability and Estimation of Hydraulic Conductivity in C Horizons of Sandy Loam Glacial Till Soils Comparison of One step Outflow Laboratory Method to an I n S i t u Method for Measuring Hydraulic Conductivity written by Dan B. Jaynes and published by . This book was released on 1978 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Selected Irrigation Return Flow Quality Abstracts written by and published by . This book was released on with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Selected Irrigation Return Flow Quality Abstracts 1976 written by Gaylord V. Skogerboe and published by . This book was released on 1978 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Research Reporting Series written by and published by . This book was released on 1978 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 962 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hydraulic Conductivity of Soils in Relation to the Subsurface Movement of Hazardous Wastes written by Robert Jeffrey Dunn and published by . This book was released on 1983 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Soil Hydraulic Conductivity on Two Tropical Soil Types Under Forest and a 25 Year Old Pasture written by G.J. Weerts and published by Bib. Orton IICA / CATIE. This book was released on 1991 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Soil Characterization and Modeling of Spatial Distribution of Saturated Hydraulic Conductivity at Two Sites in the Volta Basin of Ghana written by Wilson Agyei Agyare and published by Cuvillier Verlag. This book was released on 2004 with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the key parameters in hydrological and climate change modeling is a good estimation of the soil hydrauic properties in the region of interest. This study investigates the spatial distribution and variability of soil physical properties, with emphasis on saturated hydraulic conductivity at two pilot sites in the Volta Basin of Ghana. It focuses on the potential of pedotransfer functions (PTFs) and artificial neural network (ANN) approach for estimating saturated hydraulic conductivity. Saturated hydraulic conductivity was observed to be highly spatially variable; however, it can be estimated using selected PTFs and ANN for soils in the Volta Basin based on soil parameters that can readily be obtained from detailed soil maps--From cover.

Download or read book Variability of Soil Hydraulic Properties and Estimation of Plant available Water on Claypan soil Landscapes written by Pingping Jiang and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Soil hydraulic properties and plant-available water (PAW) capacity are critical properties in evaluating land management and soil productivity. This study investigated these properties for claypan-soil landscapes in Central Missouri. The objectives were: (1) to evaluate the effects and interactions of conservation management, landscape position and the claypan layer on hydraulic properties including saturated hydraulic conductivity (K [subscript] sat), water retention, pore-size distributions and bulk density; (2) to investigate direct relationships between measured PAW capacity and apparent soil electrical conductivity (EC [subscript] a), and to test the hypothesis that soil PAW capacity can be approximated at a field scale using a theoretical two-layer soil profile, i.e., a silt-loam topsoil layer and a silty-clay subsoil layer; and (3) to evaluate relationships of measured PAW capacity with measured corn grain yield as well as to estimated PAW capacity using a previously-developed Simple Inverse Yield Model (SIYM). Soil series on study sites included Mexico (fine, smectitic, mesic Aeric Vertic Epiaqulfs), Adco (fine, smectitic, mesic Aeric Vertic Albaqualfs), and Leonard (fine, smectitic, mesic, Vertic Epiaqualfs). For objective 1, management treatments were mulch tillage with a corn (Zea mays L.)-soybean [Glycine max (L.) Merr.] rotation (MTCS); no-till with a corn-soybean-wheat (Triticum aestivum L.) rotation (NTCSW) with a red clover (Trifolium pretense L.) cover crop following wheat; a Conservation Reserve Program system (CRP); and a hay crop system . For objective 3, the same two fields were used. Inputs for SIYM simulation were growing season mean maximum and minimum daily air temperature, daily precipitation, hourly vapor pressure deficit, and soil PAW. Nine site-years of corn grain yield data were used to estimate PAW. Results for Objective 1 showed management effects were only statistically evident in the surface 0 to 10-cm depth. The CRP was the best management for the soil properties studied with decreased bulk density, increased K, increased water retention, and increased fraction of larger pores. At the backslope, Kvalues for CRP and HAY were 16 and 10 times higher, respectively, than values for MTCS. The use of perennial grasses in rotation will benefit soil hydraulic properties, particularly at landscape positions most vulnerable to degradation. Results for Objective 2 showed significant relationships between the reciprocal function of EC(HAY). Landscape positions were summit, backslope and footslope. At each combination of management treatment and landscape position, intact soil core samples (76 by 76 mm) were taken from the 0- to 10-, 10- to 20-, and 20- to 30-cm soil depths. For objective 2, soil profile samples were taken at 18 to 19 locations from each of two close-by fields and PAW capacity was determined for a 1.2-m soil profile (PAW1.2). Plant-available water fraction values of 0.23 and 0.12 were used for the topsoil layer (assumed to be silt loam) and subsoil layer (assumed to be silty clay) textures, and the boundary between the two layers was determined by EC [subscript] asatsat [subscript] a (EC [subscript] a−1) and the lower limit of PAW1.2. Relationships between EC [subscript] a−1 and PAW1.2 were also found to be significant with an average regression r2 of 0.76. The two-layer-soil hypothesis was proven to provide reasonably accurate PAW1.2 estimates with root mean square error (RMSE) of 16 mm, compared with the measured PAW1.2. Large underestimates of PAW1.2 were a result of underestimation of topsoil and the SIYM PAW estimates were weak. The rvalues were 0.43 and 0.31 for the two study fields. Claypan soil characteristics (i.e., low hydraulic conductivity, slow recharge, poor drainage, and high soil resistance for water movement to roots) introduced additional yield variability, which SIYM was not designed to handle. The results of this study were useful for designing best management systems and for guiding site-specific management for claypan-soil landscapes thickness, whereas large overestimates were attributed to a few soil horizons at less than field capacity. Soil ECcan be used as a quick and cost-efficient tool to quantify and map PAW capacity for similar soil landscapes. The relationships between the measured PAW [subscript] a1.22.

Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1987 with total page 954 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Lysimeter System Designs Used in Soils Research written by B. D. Titus and published by St. John's, Newfoundland : Canadian Forest Service. This book was released on 1996 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: This review considers the agricultural, forestry, and ground-water monitoring literature and reports on the current designs of lysimeters that are relevant for use in forestry nutrient cycling studies. The review begins with a brief history of lysimetry and then presents a functional classification scheme which is used as a framework for discussing variations in lysimeter system design. The impact of lysimeter system design on sampling artefacts is briefly discussed and the literature on the effect of construction materials on soil solution contamination is tabulated. Statistical considerations of special interest involve the determination of sample size and distribution of the data. The appendix includes a translation of de la Hire's paper published in 1720, sometimes cited as an example of the earliest published work on lysimetry.

Download or read book The Handbook of Groundwater Engineering written by Jacques W. Delleur and published by CRC Press. This book was released on 2006-11-16 with total page 1342 pages. Available in PDF, EPUB and Kindle. Book excerpt: A complete treatment of the theory and practice of groundwater engineering, The Handbook of Groundwater Engineering, Second Edition provides a current and detailed review of how to model the flow of water and the transport of contaminants both in the unsaturated and saturated zones, covers the production of groundwater and the remediation of contaminated groundwater.

Download or read book Planning the Uses and Management of Land written by Marvin T. Beatty and published by . This book was released on 1979 with total page 1080 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Information Report written by and published by . This book was released on 1994 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: