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Project Component 2

Improvement of minor irrigation tanks

Objective
The component II basically deals with the improvement of physical structure and has two sub-components, one on improvement of surface water management and the other is the groundwater management. While surface water component is spread over all the tanks, groundwater management component is proposed in selected areas.

 

Objective: Component IIA -- Improvement of Minor Irrigation tanks has the following objectives:
  1. Improve the physical condition and operational performance of selected tank systems (which includes the feeder channels wherever existing, above the tank reservoir, the tank itself, and the irrigation channels in the command area) through a range of interventions identified and executed in partnership with the respective tank users
  2. Secure the safety of the tank structures
  3. Improve on-farm water management and water use efficiency
Interventions

Surface water management interventions primarily include improvement of physical structure as per the defined standards and norms set by the irrigation department whcih includes the following activites:

  • Feeder Channels-Removal of jungle growth, silt removal, re-sectioning and strengthening of channel sections to designed profile and bed slopes, providing protection walls at vulnerable locations, with provision for boulder checks and silt control measures / structures
  • Tank Bund - Removal of bushes, shrubs and jungle, raising and strengthening of earthen bund to designed top width and section duly conforming to free-board requirement, compaction of earth fill in gullies, placement of new stone revetment (duly incorporating filter backing under the revetment) where not existing, replacement of damaged revetment, resetting of disturbed revetment, providing gravel cover at bund top to facilitate all weather traffic, restoration of rock toe and toe drain, and providing positive cut-off in the vicinity of upstream toe (wherever necessary) to arrest seepages
  • Tank Sluices – Repairs / reconstruction of damaged / collapsed sluices, repair of screw gear shutters, installation of new shutters, repair / reconstruction of appurtenant works, removal of silt deposits.
  • Surplus Weirs - Reconstruction of totally damaged weirs redesigning these to revised standards, repairs of partially damaged masonry, provide concrete skin wall/lamina on upstream face of masonry body wall and crest to strengthen the weirs and arrest seepages, reconstruction of totally damaged aprons based on revised design standards, reconstruction of damaged protection structures/arrangements
  • Canals and Distribution System - Re-sectioning and strengthening of canal sections to designed profile and bed slopes, silt removal, earth fill in banking reaches to be properly compacted during strengthening, selective lining in vulnerable reaches, provision of properly designed inlets for controlled entry of surrounding water to the canals, provision of guide walls in vulnerable locations, repairs to all damaged structures, construction of cart track bridges.
  • Measuring Devices- Measuring structures will be provided at off take of tank sluice and distributaries from the main canal.

Creation of minor irrigation data base for Andhra Pradesh
There is no consolidated information available for 12000 MI tanks in the State. Information is available of different details at different levels but needs to be consolidated. It is proposed to create MI data base for detailed planning not only for this project but for future initiatives as well.

Capacity building
Capacity will be a crucial part of the component involving surface water user communities, irrigation department and project staff at state, district and support organization levels. The interventions are highlighted in Component 1.

Component IIB - Participatory Groundwater Management

Objectives: The objective of participatory groundwater management is to focus on the demand side management of groundwater rather than the conventional supply side management through participatory data collection, analyses and dissemination.


Groundwater hydrological assessment
Groundwater Assessment will be carried out by the state groundwater department of both quality and quantity aspects. The groundwater quantity monitoring will be operational in 300 selected Assessment Units with installed piezometers.  Quality monitoring will also be done in all the selected assessment units on important aspects related to drinking water for humans and animals, agriculture and other uses.

Participatory hydrological monitoring
Participatory Hydrological Monitoring (PHM) will be taken up at tank level. As part of this, assessment of local groundwater situation will be promoted through installation of rain gauges and necessary equipment in selected borewells. Data on the availability of groundwater, the yield trends and other dynamics will be collected by groundwater users and analyzed periodically. This information will be used in crop water budgeting and crop planning for improved and efficient groundwater use.

Communication strategy and dissemination
Groundwater assessment will be made at the Assessment Unit level by the Groundwater Department. PHM will be carried out by the community at tank level for collective decision making and utilisation. The information generated in the former will be disseminated and communicated in utilizable manner by SGWD.

Studies and action research

In view of the different approaches, operational units, departments and utilisation patterns influenced by externalities such as markets, there is still a huge gap in the understanding of integrated water resource management. The Project therefore proposes studies and action research for learning and documentation in the areas of surface and groundwater interactions on Assessment Units in general and tank influence zones in particular.

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