Uzbekistan - Uzbekistan - Construction and reconstruction of Bustan canal

Description

The Republic of Uzbekistan has received financing from the World Bank toward the cost of the “South Karakalpakstan Water Resources Management Improvement Project”, and it intends to apply part of the proceeds toward payments under the contract for "Construction and Reconstruction of Bustan Canal". This contract will be jointly financed by the Republic of Uzbekistan. Bidding will be governed by the World Bank's eligibility rules and procedures.

The “South Karakalpakstan Water Resources Management Improvement Project” is aimed to increase agricultural productivity in Beruniy, Ellikkala, and Turtkul districts of the Republic of Karakalpakstan. Irrigation infrastructure of project is located in the South Karakalpakstan in lower reaches of the right-bank Amudarya. The Project area covers 100 thousand hectares of irrigated land.

The main Works to be carried out under Contract include, inter alia, the following:

Lot1: Reconstruction of the existing (eastern) 35 km section of Bustan Canal: An existing earthen canal has been constructed on this route, but this requires significant reprofiling to suit the new hydraulics lined with concrete overlying a geomembrane.

The characteristics of the canal are:
- Moderate angle of slope in range 0.0001 to 0.00027;
- A Manning's number of 0.015 for cast in-situ concrete lining;
- Side slopes of 1:2.5 to be stable in some of the sandy soils along the route; in some areas of clayey loam this has been reduced to 1:1.5;
- Predominantly in embankments in order to provide water levels to command the whole project area;
- Bed width chosen to make a relatively deep section to minimize the amount of fill required to retain the design water level;
- Length of 35 km, 25 km of which is go through desert;
- Head discharge of 105 m3/s;
- Concrete lined with adequate under-drainage;
- Use of geomembrane and geotextile (in the parameters specified in the bill of quantity) covered by mass concrete with thickness 12sm.

Lot 2: Construction of the new (western) 34 km section of Bustan Canal.

The characteristics of the canal are:
- Completely new construction of 34 km canal predominantly through agricultural land.
- Concrete lined overlying geomembrane;
- Head discharge 52 m3/s;
- Small hydraulic outlet structures and two major canal structures;
- 17 road bridges, 2 pedestrian crossings and 9 culverts, four of which are major collectors flowing under the canal;
- Tail escape will be constructed to the river by undertaking minor re-profiling works of the shorter Nayman Beshtam Pump Station inlet channel.

The construction period is expected to be around 30 months.

Opportunity closing date

26 October 2016

Value of contract

to be confirmed