Sewer system projects environmental management plan


PURPOSE AND SCOPE OF THE PROJECT



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1.3. PURPOSE AND SCOPE OF THE PROJECT

A total of 30 Million Euro credit has been obtained from the World Bank (WB) to satisfy the requirements mentioned in the previous section. Of this total, 10 Million Euro will be spent on rehabilitation of the water supply system and the remaining 20 Million Euro will be used for the sewerage and stormwater system. The highlights of the project works that will be implemented with the WB credit are as follows:




  1. The water supply network of about 1500 ha area corresponding to the city center of the Denizli metropolitan area will be renewed (see Fig. 1.1). The aim of this project is to minimize the water losses and to solve problems mentioned above by constructing the necessary water supply infrastructure and by effectively operating the water supply system. To achieve this objective, rehabilitation and replacement works will be carried out on the system.

  2. The wastewater collection system will be renewed in the area that roughly corresponds to the same locality where the water supply network rehabilitation is to be conducted as discussed above (see Fig. 1.1). The sewer system project that is prepared for this purpose is aimed to dispose the wastewaters of the city of Denizli in a controlled manner without causing any environmental problems. Accordingly, the project is comprised of the construction and operation of sewer network that is composed of secondary lines.

  3. The last project that will be implemented in the center of Denizli (project boundaries given in Fig.1.1) under the WB credit is the stormwater drainage system. Presently, the city has inadequate stormwater drainage system and the project aims proper handling of stormwater without causing detrimental effects on settlements, roads etc. In addition, this project will enable to collect wastewater and storm water separately.


Figure 1.1 View of the Denizli City and the project area



1.4. BENEFITS OF THE PROJECT

The following benefits are expected to occur when the planned tasks of the project are completed.





  • According to the report, Technical Evaluation of the Water Supply Network Feasibility Studies, (dated 2005 and prepared by Erim Construction Company) water losses will be decreased from 50-60% to around 20%, and thus, water savings will be achieved,

  • Water supply system will be increased from 1110 km to 2833 km. Drinking water quality will improve as a result of less infiltration to the network. Since the new and replaced pipes (ductile iron pipe) are less permeable than the originals (old - steel and AC), there will be less infiltration

  • Operation of the water distribution system will become easier and systematic, and thus, costs associated with overuse of water and expenses caused by an aging network will be reduced

  • Denizli (Center) will have a new wastewater collection system that serves better collection and transport of wastewater. This will be a “separate system” and the storm water will not be allowed to connect.

  • Proper collection of stormwater will reduce flooding risks and also prevent damage. It will facilitate separate collection of storm water and wastewater.


1.5. SCOPE OF THE ENVIRONMENTAL MANAGEMENT PLAN

There are several infrastructure projects (Water Supply, Wastewater Collection and Storm Water Drainage in Denizli that have been completed in the past, is being constructed as of today and will be conducted in the future. These projects include the construction of reservoirs, pumping stations and wastewater treatment plants. However this Environmental Management Plan (EMP) report only considers the renewal of the pipe networks belonging to the water supply, wastewater collection and stormwater drainage systems within the regions shown in Fig. 1.1. Other parts of the Denizli Water Supply and Sewerage Project including the pumping station, wastewater treatment plant, main collectors and the chlorination unit are not within the scope of the WB-funded projects. Thus, the environmental impacts and the associated mitigation measures of only the pipe renewal works for the above-mentioned area are discussed. Nevertheless, in the operation phase of the water supply system, impact mitigation and monitoring works associated with pumping and chlorination operations are included in this EMP report for completeness purposes.



2. DESCRIPTION OF THE PROJECT AREA




2.1. GEOGRAPHICAL LOCATION

Denizli is a city of industry and tourism that is situated in southwestern part of the Aegean Region of Turkey. It is bordered by Afyon and Burdur to the east, Aydin and Manisa to the west, Usak to the north and Mugla to the south. The province lies between 37° 12’ – 38° 12’ N latitudes and 28° 30’ – 29° 30’E longitudes. The location map of Denizli in Turkey and in the Aegean Region is given in Fig. 2.1.




(a)



(b)



Figure 2.1. Location of Denizli (a) in Turkey (b) in Aegean Region
Geographically, the city covers an area of approximately 11,868 km2 and is located on the northern foothills of Akdag. It lies on a plateau which is drained by Aksu Creek, a tributary of Buyuk Menderes River.

Administratively, the province of Denizli is divided into 18 districts: Acipayam, Akkoy, Babadag, Baklan, Bekilli, Beyagac, Bozkurt, Buldan, Cal, Cameli, Cardak, Civril, Guney, Honaz, Kale, Saraykoy, Serinhisar and Tavas (see Fig. 2.2).



Figure 2.2. Districts and neighborhood provinces of Denizli





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