4. description of the environment - Gujarat Pollution Control Board
4. description of the environment - Gujarat Pollution Control Board
4. description of the environment - Gujarat Pollution Control Board
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Final Feasibility Report<br />
Preparation <strong>of</strong> Feasibility– cum-Preliminary Design for 4/6 Laning<br />
<strong>of</strong> Jetpur-Somnath section <strong>of</strong> NH 8D, Package No:<br />
NHAI/DBFOII/DPR/02<br />
<strong>4.</strong>4 AIR ENVIRONMENT<br />
<strong>4.</strong><strong>4.</strong>1 Climate and Meteorology<br />
VOLUME III:<br />
ENVIRONMENTAL IMPACT ASSESSMENT<br />
The climate <strong>of</strong> both <strong>the</strong> districts is characterized by a hot summer and dryness in <strong>the</strong> non-rainy<br />
seasons. The cold season from December to February is followed by <strong>the</strong> hot season from March<br />
to May. The south-west monsoon season is from June to September and is followed by <strong>the</strong> post<br />
monsoon season from October to November.<br />
Meteorological data has been collected from three meteorological stations <strong>of</strong> <strong>the</strong> IMD nearest to<br />
<strong>the</strong> site – Rajkot, Keshod (Junagadh) and Veraval (Junagadh).<br />
Temperature: The mean maximum temperature in <strong>the</strong> region reaches 41C in <strong>the</strong> warmer<br />
months from March to June. During <strong>the</strong> winter season, in December-January, <strong>the</strong> minimum<br />
temperature dips to 12.2C and <strong>the</strong> maximum temperature remains around 29C. The lowest<br />
average monthly minimum temperature is around 21C. The average monthly maximum and<br />
minimum temperature <strong>of</strong> <strong>the</strong> project region as recorded during <strong>the</strong> period 2007 by <strong>the</strong> Indian<br />
Meteorological Department (IMD) is presented in Table 4-2 below.<br />
Table 4-2: Temperature <strong>of</strong> <strong>the</strong> Project Region<br />
Months<br />
Rajkot<br />
Jan Feb Mar April May June July Aug. Sept. Oct. Nov. Dec.<br />
Mean Minimum 12.2 16.9 18.8 22.9 25.9 27 25.6 2<strong>4.</strong>5 2<strong>4.</strong>2 21.7 19.2 1<strong>4.</strong>1<br />
Mean Maximum<br />
Keshod<br />
28.9 32.1 35.6 41.1 41.2 38.1 33.3 31.6 33.2 35.8 3<strong>4.</strong>4 29.7<br />
Mean Minimum 12.3 16.2 18.2 22.7 25.9 - - - - - - -<br />
Mean Maximum<br />
Veraval<br />
29.3 32 35.5 38.6 36.6 - - - - - - -<br />
Mean Minimum 16.2 18.9 20.4 24 27 27.7 27.7 25.7 25.9 23.1 21.1 18<br />
Mean Maximum 30 30.1 32.9 33.5 32.3 33.3 31.6 29.9 31.3 3<strong>4.</strong>2 33.4 30.7<br />
Based on IMD Observation from 2007<br />
Humidity: The maximum humidity is observed to be 92.00 percent (Veraval) during <strong>the</strong> month <strong>of</strong><br />
August. The minimum humidity is recorded at Rajkot (26 percent) during <strong>the</strong> month <strong>of</strong> January.<br />
The monthly variation <strong>of</strong> humidity in <strong>the</strong> project region is presented in Table 4-3 below.<br />
Table 4-3: Monthly Average Humidity <strong>of</strong> <strong>the</strong> Project Region (in %)<br />
Time (hrs)<br />
Rajkot<br />
Jan Feb Mar Apr May<br />
Months<br />
Jun July Aug Sept Oct Nov Dec<br />
8.30 55 79 62 76 76 80 88 91 89 72 74 66<br />
17.30<br />
Keshod<br />
26 36 22 19 32 56 69 76 65 35 36 36<br />
8.30<br />
Veraval<br />
56 68 54 68 69 - - - - - - -<br />
8.30 54 73 60 73 82 84 88 92 86 65 67 58<br />
17.30 51 64 67 72 74 80 85 88 80 65 68 54<br />
Based on IMD Observation from 2007<br />
4-7
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