Rehabilitation of the Urban Water Supply and Sanitation in the Sava River Basin in Bosnia and Herzegovina, (BMZ ID 2002 65 876). Rehabilitation of Urban Water Supply Una-Sana region, Consulting Services (Part A) City of Kostajnica WS & WW Project (KO 01): 10,429m of Transmission Main, City Network Pipelines (DI/PE DN63-300), 334nr House Connections, 33nr Air/Drain/Gate valves, 14nr Hydrants. 4,087m of combined system collector lines (corrugated HDPE100, SN8, DN300-1000mm), 66nr house connections, 88nr maintenance RC shafts, 3nr Storm Water Overflows, 5nr Outlet Structures.

2.  Rehabilitation of the UrbanWater Supply & Sanitation in Sava River Basin (BMZ ID 2002 65 876)
 Water Supply Scope:
 Existing gravity feed Transmission main between Source Mraovo Polje and the City is approx. 25 years old and in a poor
condition resulting in approx. 5 numbers of significant repairs works per year. To ensure the water supply of the city of
Kostajnica it is necessary to replace approx. 6,500 m of the transmission main.
 Many pipe bursts in the drinking water network occur every year in the city centre of Kostajnica. These parts of the city network
consist of approx. 30 years old CI pipes. So it is necessary to replace these parts of the city network. Approx. 2400 m (OD90,
180mm) pipes and furthermore 200 house connections in these parts must be replaced
 Project Budget for WS scope – 1.000.000,00EUR
 Waste Water Scope:
 The existing sewer system has the following defects: Inflow and Infiltration of the sewer system; Cycle flow; Pipe clogging;
Pollution of the Tavija River
 Construction of a new collector from west to east main collector with HDPE pipe material and a diameter ranging from OD 400
to OD 800 shall be laid in the northern part of the city, stretching approximately 4,850m from west to east.
 In the south of Kostajnica, on the right bank of the Tavija River, a new combined sewer system consisting of a main collector
and a secondary network will be constructed. The wastewater produced by the new settlements in the south of Kostajnica will
be collected by the secondary network, which has a diameter of OD 300. The secondary network will be connected to the main
collector, which will be laid along the Tavija river from south to north and has a diameter ranging from OD 400 to OD 600.
 Project Budget for WW scope – 1.000.000,00EUR

3. Water Supply Project
Transmission Main
Replacement of existing gravity feed
Cast Iron Transmission Main from
Source “Mraovo Polje” to the City
limits has been replaced in length of
7.331m (HDPE100, PN16,
d315x28.6mm) Pipeline under a
Project with replacement of existing
Air Valves and Mud Valves in existing
shafts along the pipe route.

5. PIPELIFE PE100, SDR11, PN16, D315X28.6MM VALVES, HYDRANTS, FITTINGS

6. WSTransmission main
– Pipe-laying

8. PIPE WELDING SURVEY VERIFICATION

9. 6NR RIVER-CROSSINGS IN TOTAL

10. RIVER CROSSING BY PREFABRICATED CONCRETE SLABS
PIPE THERMAL INSULATION AND SEALING FOR RIVER
CROSSING

11. PREFABRICATED BASE SLAB WITH HORIZONTAL WATER
STOP
PREFABRICATED ROOF SLAB

14. SLUMP TEST AIR CONTENT TEST

15. CONCRETE TEMPERATURE
CONCRETE MOLDS FOR COMPRESSIVE STRENGTH AND
WATER-TIGHTNESS TESTING

16. PRESSURE TESTING AS PER EN805 EXISTING SHAFT ON TRANSMISSION MAIN

17. MUD / DRAIN VALVE – IN TOTAL 10NR NEW DRAIN VALVES
INSTALLED
AIR VALVE – IN TOTAL 9NR OF AIR VALVES INSTALLED

18. Water Supply – City
Network
Project considered replacement of
existing WS Cast Iron Pipes with
PE100, PN16 Pipelines (OD63-180) in
total length of 3.098m with associated
320nr House Connections. Connection
onto existing network to be
performed within existing node point
chamber with replacement of 14nr
existing valves, installation of 14nr
fire-hydrants.

19. SERVICE LINES PIPELIFE PE100, PN16 VALVES, FITTINGS

20. PIPE SADDLES, SERVICE VALVES, HOUSE CONNECTIONS
FITTINGS
PIPE MATERIAL PE100, PN16

21. EXISTING CULVERT CROSSING PE PIPE WELDING

22. CONNECTION TO EXISTING CHAMBER SMALL DIAMETERS PE PIPE WELDING

23. ABOVE GROUND HYDRANTS UNDERGROUND HYDRANTS

24. ABOVE GROUND HYDRANTS COMMISSIONING

25. UNDERGROUND HYDRANT COMMISSIONING

26. HOUSE CONNECTION WITH SERVICE VALVE AND PIPE
SADDLE
HOUSE CONNECTION WITH SERVICE VALVE AND PIPE
SADDLE

27. SERVICE VALVE SPINDLE PE PIPE SADDLE

28. HOUSE CONNECTION / EXISTING WATER METER SHAFT
CONNECTION TO THE EXISTING NETWORK / REPLACEMENT
OF VALVES IN EXISTING CHAMBERS

29. CONNECTION TO THE EXISTING NETWORK / REPLACEMENT
OF VALVES IN EXISTING CHAMBERS
CONNECTION TO THE EXISTING NETWORK / REPLACEMENT
OF VALVES IN EXISTING CHAMBERS

34. OUT OF REMAINING BUDGET FOR WS PROJECT WORKS,
WATER UTILITY KOSTAJNICA HAS BEEN PROVIDED WITH:
TERRAIN VEHICLE 4X4: LADA NIVA 2131, 1,7I;
FLAT BED VEHICLE: IVECO DAILY, 35S11D, 3,5T;
BACKHOE LOADER: JCB 3CX SITE MASTER 4T

35. WasteWater Project
East –West Collector
Originally waste water system (combined
type) has suffered from Inflow and
Infiltration of the sewer system due to the
poor construction quality of the concrete
pipe joints. Due to poor and wrong
construction, in some sewage pipes the
wastewater flows in both directions and
causes cycle flow. Due to heavy
overloading, the collector located in
Svetosavska Main Street was often
clogged.
Under this Project relieve of the existing
system was planned, decrease of pollution
by replacement of existing collectors and
house connections, waste water transport
and discharging at 4nr locations with
combined system Collectors - Corrugated
HDPE100, SN8:
-ID300 mm – 8m
-ID400mm – 94m;
-ID500mm – 1.075m;
-ID600mm – 61m;
-ID800mm – 1.640m;
-ID1000mm – 115m
-In total – 2.993m of collectors installed
with 28nr of House Connections (PVC ID
100mm) and 5nr Road Gullies

36. CORRUGATED HDPE 100, SN8 PIPES ID300-1000MM
CORRUGATED HDPE 100, SN8 PIPES ID300-1000MM

37. CORRUGATED HDPE 100, SN8 PIPES ID300-1000MM PVC ID100MM PIPES – HOUSE CONNECTIONS

38. PREFABRICATED CONCRETE SHAFTS PREFABRICATED CONCRETE SHAFTS

40. GEO-TEXTILE WRAPPING

42. PIPE LASER USE FOR PRECISE PIPE-LAYING SURVEYING & CONTROL

44. PREFABRICATED MANHOLES

47. COLLECTING SHAFTS WITH HOUSE CONNECTIONS

48. IN-SITY BUILT COLLECTOR-CONNECTION MANHOLES

49. IN TOTAL 49NR OF MANHOLES INSTALLED ON E-W
COLLECTOR

52. IN TOTAL 3NR STORM OVERFLOWS INSTALLED ON E-W
COLLECTOR

59. IN TOTAL 4NR OUTLET STRUCTURES BUILT ON E-W
COLLECTOR DISCHARGE LOCATIONS

64. WW North – South
Collector
Originally no sewage system existed
where inhabitants private connections
discharged waste water directly into
the Tavia River causing the pollution.
New project considered construction
of North-South Collector, collection of
all belonging house connections,
transport and discharging at
downstream location. Future projects
will consider continuation of collector
until the Waste Water Treatment
Plant.
Under this Project North South
Collector was installed (Corrugated
HDPE100, SN8):
-ID300mm – 400m;
-ID400mm – 195m;
-ID500mm – 336m;
-ID800mm – 163m
-In total 1.094m installed with 38nr
House Connections PVC ID100mm

67. PVC PIPES LEFT FOR CONNECTION WITH HOUSE SHAFT

68. RIVER “TAVIA” INCASING DURING COLLECTOR RIVER-
CROSSING WORKS

69. IN TOTAL 32NR MANHOLES INSTALLED ON N-S COLLECTOR

73. CASCADE CHAMBER HOUSE SHAFT

75. COLLECTION SHAFT (IN TOTAL 38NR HOUSE CONNECTIONS
INSTALLED ON N-S COLLECTOR)

77. 1NR OUTLET STRUCTURE INSTALLED ON NORTH – SOUTH
COLLECTOR. FUTURE PROJECTS WILL CONTINUE
COLLECTOR TO WASTE WATER TREATMENT PLANT

78. TIGHTNESS TESTING PERFORMED IN ACCORDANCE WITH
EN1610 STANDARD

79. IN ACCORDANCE WITH ATV M14 PART 2

81. WW COLLECTOR’S CCTV RECORDED LONGITUDINAL
PROFILE
SURFACE REINSTATEMENT / COMPACTION