Basic Data:

Activities Covered by Waste Water Collection:

The Waste Water Collection (Sewerage) Network

Based on the configuration of the terrain, the city is grouped into eight collection areas; hence there are eight trunk collection sewers – collectors. The collectors are designated by numbers ranging from O to VII.

A general system of channelling is applied in waste water evacuation, i.e. we use the same sewers for both waste and stormwater. Most of the stormwater enters the sewerage through surface water gullies. The sewerage system is gravitational on the whole territory of collection. The sewerage network shows wide diversity in its characteristics, material used and level of construction. About 60% of the planned total sewerage network length has been built so far in a total length of 240 kms.

Snimanje kanalizacione mreže specijalnom video kamerom

(Pipeline Inspection and Rehabilitation – PIR)

The Pipeline Inspection and Rehabilitation (PIR) system serves for the visual inspection of the sewerage pipeline by a special camera which is let down in the sewers and by remote controlling the whole network may be inspected.

Owing to this system the fissures, impediments, plugging may be detected in the sewer system and the place for intervention (drilling) may be precisely determined. Since the system is inspected from its inside, there is an opportunity to disclose illegal connections, too. The system is designed so that the video signal, after micro processing, is loaded in the PC through a special video-card, where the data are analyzed by a special programme and entered in the internal data base. The operator directs the camera from a boot and records by the programme everything, which may prove to be interesting. Making photos is provided by the camera’s freeze function, and these are digitalized in the programme and attached to reports. Making videos in compressed divx format is also possible. After the full profile is obtained, a report is generated including all interesting data from the specific segment of the sewerage.

There is an additional option within this programme, namely the recording of the so called height profile, which is important in building new sewerage pipelines, since each sewerage must have some minimum natural downfall. This device is equipped with a downfall measuring sensor, which enables to control the sewerage in view of the investor’s requirements.

Review of the Materials and the Length of the Sewerage Networks (including 2006)

Ser. no.	Type of Material	Length (m)
1	Reinforced concrete	5459
2	PE- polyethylene	1509
3	Asbestos cement	98234
4	Concrete	41941
5	Ceramic	169
6	PVC	79834
7	Masonry wall	12388
	TOTAL	239534

Review of Sewerage Network Length According to Diameters

Ser. no.	Diameter (Ø)	Length (m)
1	50	262
2	125	105
3	150	8
4	160	271
5	200	8264
6	250	87792
7	300	33790
8	315	1342
9	350	3101
10	400	25475
11	450	310
12	500	19335
13	600	8749
14	700	2373
15	800	5871
16	900	225
17	1000	4751
18	1150	500
19	1200	1482
20	1300	457
21	1500	4325
22	1800	3615
23	Masonry walled channels	27131
	TOTAL	239534