Part 2 - Eskom

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ENVIRONMENTAL SCOPING REPORT FOR THE PROPOSED 40MW OPEN CYCLE GAS TURBINE POWER PLANT IN THE AMERSFOORT AREA, MPUMALANGA 7.1.2. Climate and Rainfall Bohlweki-SSI Environmental The study area is characterised by daily summer temperatures that range between ~2 °C and ~32 °C with an average of ~17 °C. Winter temperatures range between ~8 °C and ~23 °C with an average of ~7 °C. Figure 7.2 illustrates the average monthly maximum and minimum temperatures recorded in the Majuba area, respectively. Temperature 40 30 20 10 0 -10 -20 Average Monthly Maximum and Minimum Temperatures for Majuba 2007 Jan Feb Mar Apr May Jun Jul Month Aug Sep Oct Nov Dec Figure 7.2: Average monthly maximum and minimum temperatures recorded in the Majuba area (Weather Services Station, 2007) The study area can be characterised as being a summer rainfall area with the warmer months being October to April. The mean annual rainfall for the Majuba area is 1008 m. Total monthly rainfall figures for modelled South African Weather Services (SAWS) data are illustrated in Figure 7.3. Rainfall (mm) 300 250 200 150 100 50 0 Monthly Rainfall Figures for Majuba 2007 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Month Figure 7.3: Monthly rainfall figures for Majuba area (Weather Services Station, 2007) E02.JNB.000308 ESKOM HOLDINGS LIMITED 01 40 08/10/2009 Max Min
ENVIRONMENTAL SCOPING REPORT FOR THE PROPOSED 40MW OPEN CYCLE GAS TURBINE POWER PLANT IN THE AMERSFOORT AREA, MPUMALANGA 7.1.3. Wind Bohlweki-SSI Environmental The UCG pilot plant has its own meteorological station, however data from the SAWS has been included to ensure that the data from the UCG pilot plant station is correct. Comparison was made between data sourced from the UCG pilot plant and data taken from the South African Weather Services. The period wind rose and frequency distribution for the UCG site is presented in Figure 7.4 and Figure 7.5 and the period wind rose and frequency distribution for the data sourced from the South African Weather Services is presented in Figure 7.6 and Figure 7.7. Wind roses comprise of 16 spokes which represent the directions from which winds blew during the period. The colours reflect the different categories of wind speeds. The dotted circles provide information regarding the frequency of occurrence of wind speed and direction categories. For the period assessed, winds predominated from the western and eastern sectors. The wind rose profile is typical of that experienced by low lying areas surrounded by an escarpment. From the eastern vector wind speeds of between 5.7-8.8m/s occurred most of the time. The same wind speeds occurred but were less common from the south easterly and north eastern sectors. Stronger winds of greater than 8.8m/s were also experienced from the west. Smaller contributions of strong winds were also experienced from the west-southwest and west-northwest directions. Figure 7.4: Period wind rose derived from monitored data from the UCG pilot plant (2006 to 2007) E02.JNB.000308 ESKOM HOLDINGS LIMITED 01 41 08/10/2009
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Part 2 - Eskom

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