Rainfall in Karnataka

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Heavy rains show the full might of Jog Falls in Shimoga district Jogmonsoon.jpg
Heavy rains show the full might of Jog Falls in Shimoga district

The state of Karnataka in India experiences diverse rainfall quantities across its regions. While Malnad and Coastal Karnataka receive copious amount of rainfall; its north Bayaluseemae region in the Deccan Plateau is one of the most arid regions in the country. Most of the rains received in the state is during the monsoon season. Being an agrarian economy with a large percentage of its citizens engaged in agriculture, the failure of rains can have a crippling effect on the economy of the state. Apart from the benefits in agriculture, the Government of Karnataka has tried to avail other benefits of rainfall using scientific methods. An example of this is the project, Rainwater Harvesting in Rural Karnataka which is initiated by the Karnataka State Council for Science and Technology and is one of the largest rainwater harvesting projects in the world. [1] Agumbe in the Shimoga district , Amagaon in Belgaum District, Hulikal again in Shimoga district and Talakaveri in Madikeri are some of the known places with the highest annual rainfall in South India. Of this Amagaon has received over 10000 mm rain fall twice in 10 years.

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Agumbe and Hulikal in Shivamogga District of Western Ghat region is considered as "Cheerapunji of South India" but still some places in Western Ghats region had resulted much more rainfall than these two villages. Amagaon in Belgaum District recorded magical number of 10,068mm in the year 2010 , Mundrote in Kodagu district recorded 9974mm in the year 2011.

The table below compares rainfall  between Agumbe in Thirthahalli taluk in Shimoga district, Hulikal in Hosanagara taluk in Shimoga district, Amagaon in Khanapur Taluk in Belgaum district and Talacauvery and Mundrote in Madikeri taluk in Kodagu district, Kokalli of Sirsi Taluk, Nilkund of Siddapur Taluk, CastleRock of Supa (Joida) Taluk in Uttara Kannada District, Kollur in Udupi District to show which one can be called the "Cherrapunji of South India".

YearHulikal Rainfall (mm)Agumbe Rainfall (mm)Amagaon Rainfall (mm)Talacauvery Rainfall (mm) [2] Kokalli Rainfall (mm)Nilkund Rainfall (mm)Castle Rock Rainfall (mm)Mundrote Rainfall (mm)Kollur Rainfall (mm)
20175,7006,3114,7335,85931304981556010025203
20165,7216,4494,7055,43026824655496814583496
20156,0355,5184,0135,31927304367366731434254
20147,9077,9175,5807,84487466710595655663308
20139,3838,7708,4408,62844647082366771996614
20128,4096,9335,9875,72250365398616537276715
20118,5237,9219,3686,85544376593708399747083
20107,7176,92910,0686,7944002--50427685
20098,3577,982-----
20087,1157,199-----
20079,0388,255-----
20068,6568,457--- [3] [4] --

The following were the top 5 places that recorded highest rainfall in statistics [2010-2017] [5] [6] [7] [8]

RankHobli/VillageDistrictTalukYearRainfall in mmElevation in metres
1 Amagaon Belgaum district Khanapur 201010,068785
2Mundrote Kodagu district/Coorg District Madikeri 20119,974585
3 Hulikal Shimoga district Hosanagara 20139,383614
4 Agumbe Shimoga district Thirthahalli 20138,770643
5Kokalli/Kakalli Uttara Kannada Sirsi 20148,746780

The following places recorded highest rainfall with respect to each year [2010-2017]

YearPlaceTalukDistrictRainfall in mmElevation
2017 Agumbe Thirthahalli Shimoga district 6,311634
2016Agumbe Thirthahalli Shimoga district 6,449634
2015Hulikal Hosanagara Shimoga district 6,035614
2014Kokalli Sirsi Uttara Kannada 8,746780
2013Hulikal Hosanagara Shimoga district 9,383614
2012Hulikal Hosanagara Shimoga district 8,409614
2011Mundrote Madikeri Kodagu district 9,974585
2010Amagaon Khanapur Belgaum district 10,068785


[9] [10] [11] [12] [13] [14]

Importance

The economy of Karnataka is mainly agrarian and most of it is dependent on the rainfall; mainly the southwest monsoon. The extent of arid land in the state is second only to Rajasthan. [15] Only 26.5% of sown area (30,900 km²) is subjected to irrigation and hence the rest of the cultivated land is entirely dependent on rainfall. [16] Rainfall also influences the quantity of water available in the rivers which in turn influences the amount of drinking water available to the population and the amount of electricity that can be generated in the hydroelectric power stations in the state. The importance of rainfall is such that Karnataka sometimes had to resort to costly artificial methods like cloud seeding in order to induce rain artificially. [17] Rainfall is also crucial to recharge the depleting ground water and Karnataka has come up with innovative methods like rainwater harvesting in order to solve the drinking water scarcity in the state.

Rainwater harvesting

Karnataka is a pioneer in the concept of rainwater harvesting with The Karnataka State Council for Science and Technology (KSCST) implementing one of the largest rainwater harvesting projects in the world. 23683 schools in rural Karnataka were selected for this project with the main goal of providing drinking water by using the method of rooftop harvesting. [1] In this project, rainwater collected on the rooftop is channeled through a system of PVC pipes and stored in an enclosed surface tank. The pipeline consists of a first-flush filter which flushes out the first rainfall along with other contaminants that may exist on the roof and then subsequent cleaner rainwater is allowed to pass on to the tank. A sand bed filter is used to further eliminate impurities in the water before it gets collected in the tank. [1] Further precautions are taken to prevent dust and insects from entering the tank.

Consequences

Deficient rainfall

A year of deficient rainfall leads to the following consequences:

Excess rainfall

Heavy rains can lead to a significant loss of life and property and also cause damage to the crops. [20] Excess rains also cause an impact in major cities with inundated roads causing traffic jams. An example of this was in the year 2005 when the Madivala lake overflowed on to the Hosur Road in Bangalore forcing many schools and offices to close. [21]

Rainfall distribution

The average annual rainfall in Karnataka is 1248 mm. [22] The state is divided into three meteorological zones viz. North Interior Karnataka, South Interior Karnataka and Coastal Karnataka. Coastal Karnataka with an average annual rainfall of 3456 mm is one of the most rainy regions in the country. Contrasting this, the region of South Interior Karnataka and North Interior Karnataka receive only 1126 and 731 mm of average annual rainfall. [23]

Districts

The average annual rainfall in the districts of Karnataka varies from 562 mm (22.1 in) in the Bagalkot district to 4,119 mm (162.2 in) in the Udupi District. Bagalkot, Chitradurga and Koppal are the districts which receive the least rainfall whereas Udupi, Dakshina Kannada, Uttara Kannada, Hassan, Kodagu, Chickmagalur and Shivamogga districts receive the heaviest rainfall.

Annual Rainfall in Karnataka 1991-2005 Kar rainfall.JPG
Annual Rainfall in Karnataka 1991-2005
Average annual rainfall in the districts of Karnataka [23]
DistrictAverage annual rainfall
mminches
Bengaluru Urban 97838.5
Bengaluru Rural 88534.8
Chitradurga 57322.6
Davanagere 70028
Kolar 74429.3
Shivamogga 1,81371.4
Tumkuru 68827.1
Bagalkote 56222.1
Belagavi 80831.8
Vijapura 57822.8
Dharwad 77230.4
Gadag 61224.1
Haveri 75329.6
Uttara Kannada 2,835111.6
Bellary 63625.0
Bidar 84733.3
Gulbarga 77730.6
Koppal 57222.5
Raichur 62124.4
Chamarajanagar 75129.6
Chikmagaluru 1,92575.8
Dakshina Kannada 3,975156.5
Hassan 1,03140.6
Kodagu 2,718107.0
Mandya 80631.7
Mysuru 79831.4
Udupi 4,119162.2

Notes

  1. 1 2 3 A. R. Shivakumar. "World's largest rainwater harvesting project in Karnataka" (PDF). Current Science, VOL. 92, NO. 2, 25 JANUARY 2007. Online webpage of Indian Academy of Sciences. Retrieved 25 June 2007.
  2. Amagaon has got over 10,000 mm annual rainfall twice in the five years (2006-2010). The exact amount of rainfall is not available. See Amagaon is now Cherrapunji of South from DeccanHerald.com accessed 23 March 2013
  3. "Govt of Karnataka Rainfall Statistics (Kokalli)" (PDF). DES.
  4. "Rainfall Statistics of Karnataka". DES Karnataka.
  5. "Rainfall Statistics for Kokalli (Ajjimane)" (PDF). DES Karnataka.
  6. "Rainfall Statistics for Amagaon" (PDF). DES Karnataka.
  7. "Rainfall Statistics for Mundrote" (PDF). DES Karnataka.
  8. "Rainfall Statistics for Agumbe and Hulikal" (PDF). DES karnataka.
  9. "Govt of Karnataka Rainfall Statistics (Kokalli)" (PDF). DES.
  10. "Rainfall Statistics of Karnataka". DES Karanataka.
  11. "Rainfall Statistics for Kokalli (Ajjimane)" (PDF). DES Karnataka.
  12. "Rainfall Statistics for Amagaon" (PDF). DES Karnataka.
  13. "Rainfall Statistics for Mundrote" (PDF). DES Karnataka.
  14. "Rainfall Statistics for Agumbe and Hulikal" (PDF). DES karnataka.
  15. "Karnataka Human Development Report 2005" (PDF). Online webpage of the Planning Commission. Government of India. Retrieved 26 June 2007.
  16. "Karnataka Agricultural Policy 2006" (PDF). Online webpage of Department of Agriculture. Government of Karnataka. Retrieved 26 June 2007.
  17. B Chandrashekhar (21 September 2003). "Cloud-seeding experts counsel patience". The Hindu . Chennai, India. Archived from the original on 22 January 2004. Retrieved 26 June 2007.
  18. Parvathi Menon. "From debt to death". Online webpage of The Frontline, Volume 20 - Issue 20, September 27 - October 10, 2003. © 2003, Frontline. Archived from the original on 5 March 2010. Retrieved 26 June 2007.{{cite web}}: CS1 maint: unfit URL (link)
  19. "Belgaum facing power shortage of 46 mu a month". The Hindu . Chennai, India. 22 March 2007. Archived from the original on 29 March 2007. Retrieved 26 June 2007.
  20. "Heavy rains in Karnataka, toll climbs to 117". The Times of India . 24 June 2007. Archived from the original on 26 January 2013. Retrieved 26 June 2007.
  21. "Bangalorean's water woes continue". The Hindu . Chennai, India. 25 October 2005. Archived from the original on 27 October 2005. Retrieved 26 June 2007.
  22. "Rainfall". Online Webpage of the Department of Agriculture. Government of Karnataka. Retrieved 26 June 2007.
  23. 1 2 "Average annual rainfall of the states of India". Online webpage of Rainwaterharvesting.org. © Centre for Science & Environment, India. Retrieved 26 June 2007.
  24. "Rainfall statistics". Online webpage of the Department of Agriculture. Government of Karnataka. Retrieved 26 June 2007.

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