Irrigation and Water Resources Development provides the basic infrastructure for the growth of economy of the country and large investment has been made for the purpose in our country. Irrigation is an artificial application of water to the soil for crop production by constructing headworks (weir) across a river in case of flow irrigation system. In lift irrigation system water required for irrigation purpose has been lifted from the river as the situation commands by diesel operated or electricity power operated barge mounted pump. In third case where these two systems are not feasible required water are extracted from the water bearing aquifer beneath the ground level by means of deep tube well assembly. Besides these popular system of irrigation there are sprinkler system and drip irrigation system. In a world of explosive population growth, particularly in developing nations, it is the need of the time to enhance the growth of food grain production keeping in conformity with the increase in population. The increase in agricultural production in general and food grain production in particular has not kept pace with the growth of the population by ushering the traditional cultivation system. Every means must therefore be sought to increase agricultural production. In the arid and semi-arid zones of the world one of the principal means to achieve this is development of irrigation. Our country, India also needs irrigation to keep pace with the growth of its huge population, which has crossed one billion mark in this millennium.
NECESSITY OF IRRIGATION IN THE STATE OF ASSAM :
The economy of Assam is predominantly agricultural based, as about 85% of the populations live on agricultural activities for their livelihood and 15 % is dependent on allied services. The total geographical area of the State is 78.483 lakh hectare. Gross cropped area of the State is 41,59,977 hectare out of which net area shown is 28,10,597 hectare which is 35.81% of the geographical area of Assam. In order to cope up with the food deficit caused by growth in population and to ensure food security, multiple cropping with irrigation support is highly necessary. Moreover due to vagaries of nature, global warming, ecological imbalance and erratic monsoon, the rain fall is not taking place at right time to the help of the agricultural practices. As such irrigation input is found to be the only alternative which can provide right amount of water at right time to carry out agricultural activity.
CREATION OF IRRIGATION DEPARTMENT :
In due cognizance of the criticality of irrigated agriculture in ensuring adequate production which results both in food security and economic growth , Irrigation Department was initiated its independent functioning in the year 1974 by bifurcating it from the erstwhile Flood Control and Irrigation Department. The Department is playing a vital role in the development of irrigation potential of Assam by harnessing the rich surface water and ground water resources of the state. The Irrigation Department has achieved an irrigation potential of 8.82 lakh hectares upto March 2015 that includes the potential created by ASMIDC (1,49,205 Ha) merged with Irrigation Department. But in reality the potential created by ASMIDC have no existence in the field as they are of short lived nature (LLP & STW). Accordingly in practice, potential created by Irrigation Department is 7,32,599 Ha neglecting the figure created by ASMIDC.
ii) Assured irrigation water during all seasons to the cultivators and rendering services against impending draught like situations and also creation of irrigation potential through irrigation schemes.
iii) Utilization of 7.32 lakh hectares of created irrigation potential by equitable distribution of water through command area development and water management for upliftment of the socio economic condition of farmers by adopting multiple cropping system by way of Participatory Irrigation Management (PIM).
iv) Rendering assistance to form water user’s association and handing over the completed irrigation schemes to the farmers for upkeepment of completed irrigation schemes and thereby creating scope of active participation of farmers in irrigated agriculture.
v) Collection of Irrigation Service charges from the farmers for utilization of irrigation water.
vi) Creation of additional potential through Major and Medium and Minor Irrigation schemes targeting to cover the entire Ultimate Irrigation Potential of 27 lakh hectares in phased manner.
vii) To create the scope of Generation of hydro electric power from canal drop/fall where found feasible.
viii) To provide scope for improvement of rural communication using inspection path provided along important canals and canal embankments.
ix) Indirect employment in agricultural sector and engagement of skilled and unskilled labour in contractual works in executing the schemes.
x) To prevent the haphazard growth of urban development.
IRRIGATION DEVELOPMENT IN ASSAM :
Out of total geographical area of 78.438 lakh hectares, total crop area of the State is about 41.59 lakh hectares as per latest available figures. The ultimate irrigation potential is assessed as 27.00 lakh hectares. Irrigation Department has assessed to cover an ultimate Irrigation potential to the tune of 27 lakh hectare in phased manner by harnessing the rich surface water and ground water resources of the State. Irrigation Department of Assam executes and maintains Major schemes (potential above 10,000 hectare), Medium schemes (potential between 2,000 hectare to 10,000 hectare) and Minor schemes (potential below 2,000 hectare). It is planned to provide Irrigation facilities to 17 lakh hectare of cropped area through Minor Irrigation schemes and remaining 10 lakh hectares through Major and Medium Irrigation projects out of the ultimate Irrigation potential. The area to be covered by Minor Irrigation schemes (17 lakh hectares) is further categorized as 10 lakh hectare from ground water resources and remaining 7 lakh hectares from surface water resources. The popular means of irrigation adopted in the State are:
(3) In third case where these two systems are not feasible, required water are extracted from the water bearing aquifer beneath the ground level by means of deep tube well assembly. Besides these popular system of irrigation there are sprinkler system and drip irrigation system.
The Irrigation Department is the nodal authority of the Government of Assam responsible for harnessing water resources by constructing Weirs/Headworks and networks of water carrier system/canal.