Rehabilitation of the Urban Water Supply & Sanitation in Sava River Basin (BMZ ID 2002 65 876)

The existing sewer system has the following defects: · Low connection rate. In the city centre of Kakanj, the existing sewer system serves only 35 % of the inhabitants,

who are connected to the public water supply system of. The other inhabitants discharge the wastewater without authorization on to the land, which has caused severe environmental and public health problems.

· In the settlement, where a separate sewer system is existent, some house connections have been connected to the storm water pipes instead of to the wastewater pipes. This will cause the pollution of the water body if the wastewater shall be treated in a WWTP in the future.

· An important drinking water source “Pitka Voda”, which is situated near the city centre and is recharged with water from the Zgosca river by bank filtration. The nearby discharge of the untreated wastewater into the Zgosca river will cause severe damage to the drinking water supply.

Some sewers don not discharge the collected waster water into a receiving water body, e.g. the Zgošća river or Bosna river, but without authorization on to the land, which has caused severe environmental and public health problems.

· The sewerage collectors in the settlements of Mile and New Bare discharge the wastewater into the nearby creeks, which flows through a valley before it reaches the Bosna river. This caused, the valley is very often flooded by wastewater.

Lot 1: Construction of a separate sewer system in Zone 1 - DN250-400, L=4,623m Lot 2: Construction of a separate sewer system in Zone 2 - DN250, L=1,546m Lot 3: Construction of a separate sewer system in Zone 3 – DN250, L=1,098m Lot 4: Rehabilitation of the existing sewer system in Zone 4 - DN1000, L=30m Lot 5: Rehabilitation of the existing sewer system in Zone 5 – DN400, L=437m Lot 6: Rehabilitation of the existing sewer system in Zone 6 – DN350-400, L=1,150m Designed length in total – 8,854m Storm Water Overflows - the construction of three storm water overflow structures shall be also included in the

scope of works. Two storm water overflow structures shall be integrated into the existing sewer mains. One storm water overflow structure shall be constructed at the connection of the existing and the new sewer mains.

Inspection / Maintenance Shafts - the construction and integration of approximately 298 maintenance shafts (incl. 18 backdrop shafts) into the existing sewer mains shall be included in the scope of works.

Bridge Foundation Crossing: the bridge crossing is located at the end of Zone 1. The main collector will run through the foundation of the city bridge.

House Connections – The Contractor is to provide material and construct approx.294pcs, while as a part of Water Utility’s “contribution”, Water Utility is to construct approx.293pcs of House Connections from material provided by the Contract

Water Utility Kakanj is to be provided with the following mechanization: Hydraulic Excavator, Backhoe Loader & Pick-up vehicle

Project Budget – 2,000,000.00EUR

PROJECT SIGN BOARD PIPE MATERIAL: CORRUGATED HDPE SN8 PIPES (DN250-1200) PVC SN4 (DN160-200)

SHAFT COVERS, VARIOUS MATERIAL PREFABRICATED MAINTENANCE SHAFTS

PREFABRICATED MAINTENANCE SHAFTS PREFABRICATED COLLECTION SHAFTS

WU PROVIDED UNDER CONTRACT WITH: HYDRAULIC EXCAVATOR NEW HOLLAND

BACKHOE LOADER NEW HOLLAND & PICK-UP VEHICLE TOYOTA HILUX 4X4

GEO-TEXTILE PIPE WRAPPING

Bridge Foundation / Pipe Jacking

PIPE-SADDLE CONNECTION OF HOUSE CONNECTION

PREFABRICATED COLLECTION SHAFT IN-SITY DRILLING FOR HOUSE CONNECTION

COLLECTION SHAFT

CASCADE SHAFT

CONCRETE CULVERT INSPECTION SHAFT

STROM WATER OVERFLOW (SWO1) WITH OUTLET STRUCTURE

STORM WATER OVERFLOW WITH OUTLET STRUCTURE

STORM WATER OVERFLOW (SWO3)

STORM WATER OVERFLOW (SWO3)

OUTLET STRUCTURE WITH FLAP VALVE

LAID ALONG THE MAGISTERIAL ROAD RIVER BOSNA OUTLET STRUCTURE

RIVER BOSNA OUTLET STRUCTURE RIVER BOSNA OUTLET STRUCTURE

DOWNSTREAM PIPE CLOGGED BY BALLON UPSTREAM SHAFT FILLED WITH WATER

COLLECTOR FLUSHING CCTV INSPECTION

Zone 1 – Take Over Inspection

In total installed: HDPE (SN8) DN250 – 3,801m; HDPE (SN8) DN300 – 580m; HDPE (SN8) DN350 – 21m; HDPE (SN8) DN400 – 16m; Total Collector length 4,418m; Total House Connections – 277nr

Zone 2 – Take Over Inspection

In total installed: HDPE (SN8) DN250 – 1,781m; Total House Connections – 87nr

CASCADE SHAFT

Zone 3 - Take Over Inspection

In total installed: HDPE (SN8) DN250 – 95.35m Total House Connections – 2nr

Zone 4 - Take Over Inspection

In total installed: HDPE (SN8) DN500 – 80m HDPE (SN8) DN1000 – 20m Total Collector length 100m;

Zone 5 – Take Over Inspection

In total installed: HDPE (SN8) DN250 – 590m HDPE (SN8) DN400 – 424m Total Collector length 1014m; Total House Connections – 51nr

Zone 6 – Take Over Inspection

In total installed: HDPE (SN8) DN250 – 340m HDPE (SN8) DN350 – 200m HDPE (SN8) DN400 – 935m Total Collector length 1,475m; Total House Connections – 73nr

CONNECTION TO EXISTING SYSTEM

Main City Collector DN1200 Take Over Inspection

In total installed: HDPE (SN8), DN1200 – 382m

Remaining Budget

Considering the remaining Budget, the following material has been provided for WU “Vodokom” Kakanj : HDPE (SN8) Pipes: DN250 Pipes – 1,000m; DN400 Pipes – 250m; PVC (SN4) Pipes DN160 – 1,500m; DN200 – 1,500m; Pipe saddles DN250/160 – 100pcs; Flat Bed Vehicle IVECO In total 265nr maintenance shafts have been installed under the Project, 139nr of House Connection Collection Shafts. Total number of installed House Connections (households connected) to new WW System – 496nr.