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Establishing an Enabling Environment for Tank Development

Strengthening Community Development

Undertaking Tank System Improvements

Tank Works Improvement| Agriculture & Horticulture Improvement | Technical Assistance For IG Activities | Technology Development |

Sub-component 1: Tank civil works improvement

The objectives of this sub-component would be to improve tank storage capacity, to rehabilitate tank physical structure and infrastructure, as necessary, to reduce siltation by stabilizing drainage lines to the tank, and to improve water distribution and irrigation systems in the tank command area. This would be achieved through the implementation of physical works, as determined in the ITDP for each tank, including

Feeder channel improvement
Tank bed desiltation
Repairs of breaches to bunds,
Repair or replacement of sluices
Repairs of surplus weirs,
Essential construction/repairs to structure in canal and drainage systems (such as desilting of field channels, construction of outlets, division boxes and water measuring structures) and
Construction of water measuring flumes, as indicated below.

Component of tank system	Present condition	Menu items (TUG selects)
Feeder channel	Carrying capacity reduced due to siltation and encroachment by cropping/vegetation.	Cleaning, re-alignment of inflow channel, provision of benchmark pillars and model section at 500m interval, and construction of loose boulder and masonry checks.
Tank bed	Storage capacity reduced by about 30% because of siltation. Low reservoir operating levels to avoid bund failure/collapse	Removal of silt (quantity to be removed will range between 20 to30%).
Tank bund	Scouring and erosion of the bunds; top width reduced to about 1m; revetment damaged/missing; seepage through the bunds; trees and vegetative growth (access blocked for O & M and local use)	Bund across-section rehabilitation and improvement (increase the top width to 2.5m), vegetative growth removal and repair or provision of revetment.
Tank sluices	Operable or damaged, lack water controlling arrangement; excessive seepage or blockage from siltation;	Repair of structure, provision of water control devises and silt removal.
Surplus weir	Major damages-causing scouring, foundation failures and apron damage	Repair to the structure and outlet sections
Main distribution system and OFD works	Main canal length not sufficient; seepage Loss; no outlets and water control structures no tertiary network; ineffective water distribution and over irrigation at upper reach; no irrigation at upper reach; no irrigation at tail end; poor o-farm water logging and no drainage structures (canals)	Extension of main canals and selective lining; provision of outlets/turnouts, water control and measuring structures; provision of on-farm water management works, and drains and cross drainage structures were needed. Training to improve on-form water management practices.

Total estimated costs for improvement of medium tanks would be US$32.06 million and of large tanks would be US$49.32 million.
These improvement works would result in

Extension of the useful life of existing bunds and sluices;
Reduction in leakages and seepage of water through bunds, sluices and canals;
Increase in water use efficiency through on-form development works; and
Minimization of resiltation of tanks.

This sub-component would also finance TUG/TUC administrative and management costs related to operation and maintenance of the tank system (US$0.77 million).