Facilitating Interpretation of the Cathedral Peak Vi Catchment Hydrograph Using Soil Drainage Curves

Research Article| December 01, 2011 FACILITATING INTERPRETATION OF THE CATHEDRAL PEAK VI CATCHMENT HYDROGRAPH USING SOIL DRAINAGE CURVES B.T. KUENENE; B.T. KUENENE Department of soil, crop and climate sciences, University of Free State, P.O. Box 339, Bloemfontein, 9300, e-mail: kuenenebt@ufs.ac.za; vHuystC@ufs.ac.za; leRouxPA@ufs.ac.za; HensleyM@ufs.ac.za Search for other works by this author on: GSW Google Scholar C.W VAN HUYSSTEEN; C.W VAN HUYSSTEEN Department of soil, crop and climate sciences, University of Free State, P.O. Box 339, Bloemfontein, 9300, e-mail: kuenenebt@ufs.ac.za; vHuystC@ufs.ac.za; leRouxPA@ufs.ac.za; HensleyM@ufs.ac.za Search for other works by this author on: GSW Google Scholar P.A.L LE ROUX; P.A.L LE ROUX Department of soil, crop and climate sciences, University of Free State, P.O. Box 339, Bloemfontein, 9300, e-mail: kuenenebt@ufs.ac.za; vHuystC@ufs.ac.za; leRouxPA@ufs.ac.za; HensleyM@ufs.ac.za Search for other works by this author on: GSW Google Scholar M. HENSLEY; M. HENSLEY Department of soil, crop and climate sciences, University of Free State, P.O. Box 339, Bloemfontein, 9300, e-mail: kuenenebt@ufs.ac.za; vHuystC@ufs.ac.za; leRouxPA@ufs.ac.za; HensleyM@ufs.ac.za Search for other works by this author on: GSW Google Scholar C.S. EVERSON C.S. EVERSON School of Bioresources Engineering and Environmental Hydrology, University of Kwazulu-Natal, Pietermaritzburg, e-mail: Eversonc@ukzn.ac.za Search for other works by this author on: GSW Google Scholar Author and Article Information B.T. KUENENE Department of soil, crop and climate sciences, University of Free State, P.O. Box 339, Bloemfontein, 9300, e-mail: kuenenebt@ufs.ac.za; vHuystC@ufs.ac.za; leRouxPA@ufs.ac.za; HensleyM@ufs.ac.za C.W VAN HUYSSTEEN Department of soil, crop and climate sciences, University of Free State, P.O. Box 339, Bloemfontein, 9300, e-mail: kuenenebt@ufs.ac.za; vHuystC@ufs.ac.za; leRouxPA@ufs.ac.za; HensleyM@ufs.ac.za P.A.L LE ROUX Department of soil, crop and climate sciences, University of Free State, P.O. Box 339, Bloemfontein, 9300, e-mail: kuenenebt@ufs.ac.za; vHuystC@ufs.ac.za; leRouxPA@ufs.ac.za; HensleyM@ufs.ac.za M. HENSLEY Department of soil, crop and climate sciences, University of Free State, P.O. Box 339, Bloemfontein, 9300, e-mail: kuenenebt@ufs.ac.za; vHuystC@ufs.ac.za; leRouxPA@ufs.ac.za; HensleyM@ufs.ac.za C.S. EVERSON School of Bioresources Engineering and Environmental Hydrology, University of Kwazulu-Natal, Pietermaritzburg, e-mail: Eversonc@ukzn.ac.za Publisher: Geological Society of South Africa First Online: 09 Mar 2017 Online ISSN: 1996-8590 Print ISSN: 1012-0750 © 2011 Geological Society of South Africa South African Journal of Geology (2011) 114 (3-4): 525–534. https://doi.org/10.2113/gssajg.114.3-4.525 Article history First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation B.T. KUENENE, C.W VAN HUYSSTEEN, P.A.L LE ROUX, M. HENSLEY, C.S. EVERSON; FACILITATING INTERPRETATION OF THE CATHEDRAL PEAK VI CATCHMENT HYDROGRAPH USING SOIL DRAINAGE CURVES. South African Journal of Geology 2011;; 114 (3-4): 525–534. doi: https://doi.org/10.2113/gssajg.114.3-4.525 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietySouth African Journal of Geology Search Advanced Search Abstract It was hypothesized that, with regard to subsurface flow from the cathedral Peak VI catchment: (a) a defined change in the slope of the hydrograph during a prolonged almost rain free period reflects the onset of outflow from a particular water storage zone of the catchment; (b) reliable soil (upper vadose zone) drainage curve data can help to interpret outflow from that particular water storage zone. To test the hypothesis, measured hydrograph and soil water data from previous studies in the Cathedral Peak VI catchment were used. Drainage curves were derived for the main soils during the rain free autumn periods of four years 1991 to 1994 and the relevant hydrograph were subdivided into appropriate logical regions. The contribution of the soils (upper vadose zone) to streamflow was estimated using the soil drainage curves from selected sites together with the areas of the catchment that they represented. The estimations were compared to estimations done using data from measured streamflow values for the equivalent periods of the hydrographs. The results obtained by the two estimates were as follows, with measurement year, then hydrograph and soil drainage curve estimates (m3), respectively: 1991, 24841, 20061; 1992, 39048, 16528; 1993, 29967, 28448; 1994, 15703, 20809. Apart from the results for 1992, for which a logical explanation is provided, it is concluded that the hypothesis is valid. 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