South Garo Hills – Meghalaya PCS Free Notes

Minerals in Meghalaya

January 15, 2018October 26, 2024 by rawan239

Minerals in Meghalaya

Meghalaya is endowed with sizeable deposits of a number of valuable minerals. Coal, limestone, uranium, granite, kaolin, clay and glass sand are the principal minerals. A brief account of mineral resources is as follows:

Limestone

An extensive bed of limestone occurs in the Southern part of the State from Jaintia Hills in the East and Garo Hills in the West. The main deposits are found around Cherrapunjee, Mawlong, Ichamati, Shella, Komorrah in the East Khasi Hills district; Borsora and Bagli in the West Khasi Hills district; Lakadong, Lumshnong and Nongkhlieh in the Jaintia Hills district; and Darrang Era-aning, Siju, Chokpot in the South Garo Hills district.

Coal

Most of the coal reserves in Meghalaya are tertiary reserves.Coal occurs in Mikir Hills, Khasi Hills, Jaintia Hills and Garo Hills districts. The production of upgraded coal was reported by private non-captive mines in the unorganised sector located in these areas except Mikir Hills district. The mines are operated mostly by the local tribals in their private lands.

Uranium reserves in Meghalaya

Meghalaya is the third uranium rich state in the country after Jharkhand and Andhra Pradesh. The state accounts for 16 per cent of Indias uranium reserves, with deposits estimated to be around 9,500 tones and 4,000 tones respectively at Domiasiat and Wakhyn, both in West Khasi hills region. Minerals in Meghalaya

Kyelleng-Pyndengsohiong, Mawthabah (KPM) uranium mining project is located in the West Khasi Hills district of Meghalaya state in the North East region of India. Formerly this project was also known as Domiasiat uranium mining project. The Atomic Mineral Directorate for Exploration and Research in 1972 found evidences of uranium deposits in the area which was confirmed by 1996 after intensive drilling between 1992 and 1996. Uranium Corporation of India Limited (UCIL) proposes to mine it using open pit mining method up to a depth of 45 m. The processing plant will be constructed at Mawthabah. It is estimated that KPM deposit in Meghalaya will last for 25 years.

Clay

Clay of various types such as Kaolin (China clay), white clay, and fire clay are found in various parts of the states. These clay are suitable for the ceramic, paper, rubber and refractory industries. It has been estimated that there are a few hundred million tonnes of clay reserved in the state.

Granite reserves

Deposits of multi-coloured granite have been located around nongpoh in the Ri-Bhoi district, mylliem in the east khasi hills district; mawkyrwat and nongstoin in the west khasi hills distric.

Sand deposits

The sand deposits of the State are mainly concentrated in Khasi hills. The glass deposits of Laitryn grew coal field and around Shillong are found to be suitable for manufacturing of ordinary bottle glasrs, window glass etc. and with some chemical pu rification even for sheet glass and flint glass. Some of the sands are within the specifica tion o f foundry sands, which are now in great demand in the country. The estimated reserve of glass deposits is about 2.30 m illion tonnes as against Tripura – 0.18 m illion tones.

Feldspar and quartz occur near Tura in Garo hills and near Hahim in Khasi Hills. The estimated mining reserve of feldspar in the State (0.02 million tonnes) is at par with Assam (0.02 million tonne),2 3456 while the quartz is 2.03 m illion tonnes as compared to Tripura – 0.19 million tonnes.

Massive sillimanite associated with corrundum occurs in Khasi hills . More than 2i deposits have been located in the vicinity of Sonapahar, Nongpur and Nongbain villages and are worked by the Assam Sillimanite Ltd. Most of the deposits contain sillimanite with admixed corrundum to a little extent, one or two entirely of corrundum and several of sillimanite only.

Natural hazards and related issues of Meghalaya

January 15, 2018September 10, 2024 by rawan239

Natural hazards and related issues of Meghalaya

As the State lies in the seismically active zone, special emphasis should be given to reduce the impacts of earthquake. Moreover, it is also affected by hazards such as floods, flash floods, epidemics, fire, hailstorm, lightening, road accidents, etc.

Earthquake

The State of Meghalaya has witnessed seismic events of ‘8.7 magnitude in 1897’. This region has been identified as a potential site of a future catastrophic earthquake. With the growth of population and infrastructure seismic vulnerability has increased and previous earthquakes have provided a glimpse of the devastating potential of seismic tremors.

Cyclones

Meghalaya is situated in the north eastern direction of Bangladesh which is highly prone to cyclone/ winds. Every year about 60% of the area is affected by cyclone in Bangladesh. The Districts of West Jaintia Hills and East Jaintia Hills may experience a wind speed of up to 55m/s. Occasional cyclones do occur in western Meghalaya their severity being more during monsoon season. The Districts close to Bangladesh like South West Garo Hills, South Garo Hills, South West Khasi Hills, West Khasi Hills, fall in very high cyclonic zone due to close proximity to Bay of Bengal (which is a cyclone basin). In this zone wind speed can reach up-to 50 m/s, which can cause large scale damages. The Bay of Bengal accounts for seven percent of the annual tropical cyclone activity worldwide; the recorded frequency of cyclones per year along the Bay of Bengal is four and inevitably one of the four transforms into a severe cyclone causing human and property losses

Floods

The State with hilly terrain does not suffer from a major problem from floods, However, due to heavy rain, flash floods may be caused resulting in river bank erosion and some local damage. In Meghalaya, Natural hazards and related issues of Meghalaya floods occur in river valleys, when flow exceeds the capacity of the river channel, particularly at bends or meanders. The plain areas of Meghalaya adjoining Assam are affected by flood due to the back flow of water from the River Brahmaputra during the flood season between June and October. The tributaries like Krishnai, Jinari, Jingjiram, Rongai, Dudhnoi, Ringgi, Gohai, Dilni etc cause flood in the plain areas of the State.

Landsides

Meghalaya being a hilly terrain is prone to landslides. Every year a number of landslides have been reported from various localities. These cause a lot of miseries to public, resulting in loss of lives and properties, disruption of communication network, besides causing economic burden on the society. Landslide is primarily attributed to high slope, immature geology, neo-tectonic activity, heavy rainfall, unplanned and improper land use practice in the State. Landslides generally occur during heavy rains, that is during the months of June to October in Meghalaya.

Southern part of Meghalaya is more susceptible to Landslides than the Northern Part. National Highways like Bajengdoba-Tura-Dalu, Damra–Siju-Baghmara, Guwahati – Shillong- Tamabil, and Shillong- Jowai- Badarpur are prone to landslides.

Landslide occurred frequently at Sonapur on Shillong- Jowai- Badarpur Road, but now the problem has been mitigated by constructing a tunnel for the vehicular traffic. Urban areas of Shillong and Tura, Jowai are also prone to landslides due to the faulty Construction of Houses and rapid Urbanization.

Lightning and Hailstorms

Lightning occurs during the monsoon months and can strike at any place. Hailstorm generally occurs in the pre and post monsoon months. Some loss of crops lives and properties due to lightning and hailstorms are reported in the state.

Hazard Specific Mitigation Plan

The State Disaster Management Authority was established in the State under the Chairmanship of the Chief Minister with 8 other members under section 14 of the Disaster Management Act, 2005 by a Government notification dated 26th June, 2008. It is the apex body for disaster management in the State.

The State Executive Committee headed by the Chief Secretary with 4 other Secretaries as members was also set up to assist the State Disaster Management Authority in the performance of its functions.

The District Disaster Management Authorities under the Chairmanship of the Deputy Commissioners and Chief Executive Members of the District Councils as Co-Chairmen with 5 District Officials as members were also set up for the better management of disasters in the Districts.

Similarly at the Block and Village levels Block Disaster Management Committee and the Village Disaster Management Committee were set up headed by the respective Block Development Officers and the Village Headmen. The State Disaster Management Authority, has set uMock drill by NGO’sMock drill by NGO’sp a State Disaster Management Secretariat in 2010 which is located in the Office of the Director of Land Records and Surveys, Lower Lachumere, Shillong. The day to day functioning of the SDMA is looked after by the Executive Officer of the Secretariat.

Functions of SDMA

Framing of Disaster Management Policy and the preparation of the State Disaster Management Plan, reviewing the preparedness, prevention, mitigation and capacity building measures in the State.

Activities of SDMA

The preparedness, prevention, mitigation and capacity building programmes.

The Disaster Risk Reduction Project funded by the UNDP which focuses on the awareness programmes, capacity building, strengthening of the disaster management institutions are being implemented in the three districts of East Khasi Hills. West Garo Hills and the Jaintia Hills, While the Urban Risk Reduction Programme is being implemented in the capital city Shillong through the SDMA Secretariat the Capacity Building Programme is under the 13th Finance Commission. Besides, Hazard Risk Vulnerability Assessment (HRVA) will also be carried out for the Shillong city and the West Garo Hills through North Eastern Space Application Centre, Umiam.

State Disaster Response Fund is available for management of disasters in the State. An advance amount from the fund is made available to the Deputy Commissioners to meet any emergency arising out of disasters.

Irrigation and hydro power of Meghalaya

January 15, 2018September 6, 2024 by rawan239

Irrigation and hydro power of Meghalaya

Bamboo irrigation in Meghalaya

In Meghalaya (one of the seven northeastern states in India), an ingenious system of tapping of stream and springwater by using bamboo pipes to irrigate plantations is widely prevalent. It is so perfected that about 18-20 litres of water entering the bamboo pipe system per minute gets transported over several hundred metres and finally gets reduced to 20-80 drops per minute at the site of the plant. The tribal farmers of Khasi and Jaintia hills use the 200-year-old system. Irrigation and hydro power of Meghalaya

Dating back 200 years, tribes in Meghalaya have used bamboo drip irrigation as a means of bringing water to seasonal crops. This traditional technology uses locally available material while harnessing the forces of gravity. Holed bamboo shoots are placed downhill, diverting the natural flow of streams and springs across terraced cropland. The advantages of using bamboo are such that it prevents leakage, increases crop yield with less water, and makes use of natural, local, and inexpensive material.

The Jaintia, Khasi, and Garo hills of Meghalaya are largely made up of steep slopes and generally rocky terrain where the soil has low water retention capacity and where the use of groundwater channels is impossible. During the dry seasons, rain fed crops such as paddy, betel leaf, and black peppers can be irrigated by bamboo drip irrigation.

The bamboo drip irrigation system is normally used to irrigate the betel leaf or black pepper crops planted in arecanut orchards or in mixed orchards. Bamboo pipes are used to divert perennial springs on the hilltops to the lower reaches by gravity. The channel sections, made of bamboo, divert and convey water to the plot site where it is distributed without leakage into branches, again made and laid out with different forms of bamboo pipes. Manipulating the intake pipe positions also controls the flow of water into the lateral pipes. Reduced channel sections and diversion units are used at the last stage of water application. The last channel section enables the water to be dropped near the roots of the plan.

Bench terrace Irrigation practice

This is the common irrigation practice in Meghalaya as well as throughout the North East Himalayan region. The hill streams are tapped as soon as they emerge from the forests and the water is channeled to accommodate a series of terraces. In this system, water flows continuously from the upper to lower terraces. This method of irrigation practice is widely used for non-fertile land to be utilized for raising rice crops. Stone and gunny bags help in the maintenance of terraces and stop soil erosion problems. Submergence of water up to 5 – 8 cm is maintained continuously throughout the year. After harvesting, ear head of rice is plucked and the straw is left as such in the field, which then gets rotted and helps improving soil fertility. Mostly all farm operation is done manually; bullock power is used for field preparations only in some pockets of Meghalaya. Bench terracing is an important conservation measure for valleys and hill slopes. This is used predominantly for rice cultivation. In bench terrace agriculture practice under rainfed condition, topo-sequence crops such as maize, bean and potato are planted on upper slopes and crop requiring more water such as rice and jute are grown on lower slopes. The excess runoff from upper portion of slope is nutrient rich, utilized for the lower hill crops.

Hydro power in Meghalaya

Meghalaya is rich in potential water power resources, hydro power has played an important role in the state’s energy policy.

Small Hydro Power

In a move that aims to address the power requirements of the Megahlaya, as many as 50 mini and micro hydel power projects have been identified to be set up in different districts of the state.

The projects which have already been commissioned include Sonapani on Wahumkhra-Umshyrpi river, Pashyiang Micro HEP on Barim river and Umsaw Micro HEP on Umsaw river. The Lakhroh Micro HEP on Lakhroh river in Jaintia Hills district is under construction.

The Ministry of New and Renewable Energy (MNRE) has also identified 37 mini and micro hydel projects in the state with a cumulative power generation capacity of around 8.5 MW. Out of the total 37 projects, elecven project sites are located in West Garo Hills, South Garo Hills and East Garo Hills districts; nine of them in West Khasi Hills district; eight in East Khasi Hills district; six in the Jaintia Hills district and three in Ri Bhoi district.

Some of the hydro power projects in Meghalaya are as follows:

Myntdu-Leshka Hydro Project

The Myntdu-Leshka Hydro Project Dam (3X42 MW)[2] built across the river, undertaken by MeECL, scheduled in three phases, is located at Leshka, West Jaintia Hills district, Meghalaya near Amlarem, the sub-division headquarters. The project cost is estimated to be around INR 360 crores.

Umiam Hydro Power Complex

All the power stations are in the Umtru River which flows to the north into the mighty Brahmaputra. Running adjacent to this river are two other rivers viz. the Umiam and the Khri. Water from the Umiam basin is diverted into the adjacent Umtru basin thus enhancing the water flow of the Umtru River where all four power stations are constructed. In a similar manner, the water from the Khri River is also intended to be diverted to the existing reservoirs at the Umtru River to further enhance the power generation at the existing system.