FEIR for Boitshepi Landfill Site .pdf - Zitholele.co.za

71August 2010 8848Table 13 below illustrates the manner in which waste disposal sites are classified inaccordance with the maximum rate of deposition (MRD).Table 13: Waste Disposal Site Size Classes (DWA, 2005).Waste Disposal Site size classMaximum Rate of Deposition (MRD) (Tons per day)Communal (C) < 25Small (S) 150 > MRD > 25Medium (M) 500 > MRD > 150Large (L) > 5008.2.3 Climatic Water BalanceTo determine whether the site falls within a water deficit or a water surplus environment, aclimatic water balance needs to be determined. A water deficit environment is anenvironment in which the evaporation rate exceeds the rainfall, i.e. water is scarce. ClimaticWater Balance is a simple calculation that assists in deciding whether leachate managementis required or not, it therefore provides a conservative means of determining whether or notsignificant leachate generation will occur.The Climatic Water Balance over a period of time (B) is calculated using only the twoclimatic components of the full water balance, namely(R) and (E)The Climatic Water Balance is defined by:B = R – EWhere:Bis the Climatic Water Balance in millimetres of waterRis the rainfall in millimetres of waterEis the evaporation from soil surface in millimetres of water.The value of B has been calculated for the wet season, which for the Highveld region fallswithin the period October to March (summer rainfall). Data was available for the periodOctober 1931 to September 1996. (Refer to Appendix D2).From the available data in Appendix D3 , B was positive 5 times in 65 years (or once in 13years), which is considerably less than once in 5 years. This must therefore be regarded asa "Water Deficit Area".ZITHOLELE CONSULTING