Environmental Impact Assessment - Municipal

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EA for the Proposed STP 3.3 MICROMETEROLOGY 3.3.1 Temperature The maximum temperature recorded during the monitoring period was 38 °C whereas the minimum temperature recorded was 27°C. On an average the daily temperature varied between 18°C and 32°C. The average diurnal variation and daily maximum and minimum temperatures recorded are presented in Figure 3.1. Figure 3.2 Diurnal Variation and Maximum and Minimum Temperatures Recorded at Project site 3.3.2 Rainfall 40 35 30 O C 25 Temperature 20 15 10 5 0 Dharmapuri Rain gauge station, which is located within the study area of 2 km radius. The 70 years normal annual rainfall in the area is around 903.6 mm. The study area receives fairly good amount of rainfall during South west monsoon. The season wise normal rainfall for the Dharmapuri rain gauge station is furnished in the below Table. Rain gauge station Jan – May (Transitional Period) Dharmapuri Source: Revenue Department, Dharmapuri 219 TEMPERATURE PROFILE June – Sep (South West Monsoon) 370.5 Max Avg Min 0 30 60 90 Days Oct – Dec (North East Monsoon) - 314.1 Annual Normal 903.6 Dharmapuri <strong>Municipal</strong>ity Pure Enviro 44
EA for the Proposed STP Around 45 % of the rainfall occurs during Southwest monsoon and the remaining rainfall occurs during Northeast and Transitional period. The probability of occurrence of normal rainfall over the study area has been studied. It is observed that the chances of receiving normal annual rainfall are in the range of 30 to 35 % over the entire study area. The yearly rainfall data (1998-2008) of Dharmapuri rain gauge station collected from the State Government department is presented below in the form of graph. Rainfall in mm 1800 1700 1600 1500 1400 1300 1200 1100 1000 900 800 700 600 500 1007.4 1230.6 943.8 Rainfall - 1998- 2008 1298.8 650.8 1256.6 1503.4 1708.2 785.8 800 Dharmapuri <strong>Municipal</strong>ity Pure Enviro 45 758.2 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 Year The above rainfall graph indicates that there is deficit rainfall during the years 2002, 2006, 2007, and 2008. During 2005, The Dharmapuri rain gauge station received 1708.2 mm of rainfall, which is very high rainfall occurred for the past 10 years. 3.3.3 Relative Humidity The maximum relative humidity recorded during the monitoring period was 79% and minimum relative humidity recorded was 30% and the average relative humidity varying between 47% and 61%. The daily maximum, minimum and average relative humidity recorded during the monitoring period is presented in Figure 3.3.
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S. NO EA for the Proposed STP Envir
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Environmental Impact Assessment - Municipal

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