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    • IJAFR volume 55, no 1. 2016
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    • Irish Journal of Agricultural & Food Research
    • IJAFR volume 55, no 1. 2016
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    Visual drainage assessment: A standardised visual soil assessment method for use in land drainage design in Ireland

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    Author
    Tuohy, Patrick
    Humphreys, James
    Holden, Nicholas M.
    O'Loughlin, James
    Reidy, Brian
    Fenton, Owen
    Keyword
    Design
    land drainage
    site-specific;
    visual soil assessment
    Date
    20/08/2016
    
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    URI
    http://hdl.handle.net/11019/1140
    Citation
    Tuohy, P., Humphreys, J., Holden, N., et al. (2016). Visual drainage assessment: A standardised visual soil assessment method for use in land drainage design in Ireland. Irish Journal of Agricultural and Food Research, 55(1), pp. 24-35, doi:10.1515/ijafr-2016-0003
    Abstract
    The implementation of site-specific land drainage system designs is usually disregarded by landowners in favour of locally established ‘standard practice’ land drainage designs. This is due to a number of factors such as a limited understanding of soil–water interactions, lack of facilities for the measurement of soil’s physical or hydrological parameters and perceived time wastage and high costs. Hence there is a need for a site-specific drainage system design methodology that does not rely on inaccessible, time-consuming and/or expensive measurements of soil physical or hydrological properties. This requires a standardised process for deciphering the drainage characteristics of a given soil in the field. As an initial step, a new visual soil assessment method, referred to as visual drainage assessment (VDA), is presented whereby an approximation of the permeability of specific soil horizons is made using seven indicators (water seepage, pan layers, texture, porosity, consistence, stone content and root development) to provide a basis for the design of a site-specific drainage system. Across six poorly drained sites (1.3 ha to 2.6 ha in size) in south-west Ireland a VDA-based design was compared with (i) an ideal design (utilising soil physical measurements to elucidate soil hydraulic parameters) and (ii) a standard design (0.8 m deep drains at a 15 m spacing) by model estimate of water table control and rainfall recharge/drain discharge capacity. The VDA method, unlike standard design equivalents, provided a good approximation of an ideal (from measured hydrological properties) design and prescribed an equivalent land drainage system in the field. Mean modelled rainfall recharge/drain discharge capacity for the VDA (13.3 mm/day) and ideal (12.0 mm/day) designs were significantly higher (P < 0.001, s.e. 1.42 mm/day) than for the standard designs (0.5 mm/day), when assuming a design minimum water table depth of 0.45 m.
    ae974a485f413a2113503eed53cd6c53
    https://doi.org/10.1515/ijafr-2016-0003
    Scopus Count
    Collections
    Environment, Soils & Land Use
    Livestock Systems
    IJAFR volume 55, no 1. 2016
    IJAFR volume 55, no 1. 2016

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