Sewer system projects environmental management plan
SEWER SYSTEM IMPLEMENTATION PROJECT
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- Pipe Diameter (mm) Completed Pipeline Length (m)
- Denizli (Center) Bagirsak Creek Basin Sewer System Implementation Project (Planned) (approved in 2001)
- Subtotal (m) 108000 744000 248000 370772
- 3.3. STORMWATER DRAINAGE SYSTEM
- Location Pipe Diameter (mm) Total Length (m)
- Total 2804 1313 5177
3.2. SEWER SYSTEM IMPLEMENTATION PROJECTSeveral sewerage projects have been prepared and certain investments (infrastructures) have been completed since 1986. The major one, “Denizli Sewer System Implementation Project” was prepared by Tempo Engineering and Consulting Inc. and approved by the Bank of Provinces (Iller Bankasi) in 9.10.1986. According to this project, two main collectors were designed: 1600 mm diameter Ellez Creek Collector and 600 mm diameter Bagirsak Creek Collector. Total length of the sewer line is 1100 km (with diameters ranging from 200 mm to 1600 mm). Of these lines, 108 km is already completed (all lines having diameters 400 mm and above; and some parts of 200 mm and 300 mm diameter lines). Later “Denizli Bagirsak Creek Basin Sewer System Implementation Project” was prepared by Bank of Provinces and was approved in May 2001. This project covers the settlements (at southeastern parts of the city) located in the catchment area of the Gokpinar Reservoir, which is designated as the drinking water source of the city. Since the objective of the project was to protect the entire catchment area of the Gokpinar Reservoir, the project area has been taken to be larger than it needs to be and thus not only the eastern parts of Denizli (Center) but also Tekkekoy (Gokpinar), Bagbasi, Kinikli and Kayhan districts were included in the project’s service area. According to Bagirsak Creek project (approved in 2001), a total of 440.73 km pipeline will be constructed (370.772 km pipeline in the first phase, 67.614 km in the second phase and 2.344 km in the third phase). In addition to the projects approved in 1986 and 2001, a new project (Bagirsak Creek and Bozburun District Sewer System Implementation Project) was prepared to cover new settlements without sufficient infrastructure as a result of the expansion of municipality borders (Resolution on the “Determination of the Border” published in the Official Gazette dated 12 August 2006). Within the scope of construction works conducted by KAYA Consulting and Engineering Inc., areas with suitable elevation and location were connected to the existing sewer network. Meanwhile, Denizli Municipality has modified the Bagirsak Creek collector in order to protect the environment and connected parts of this line with suitable elevation to the 1600 mm diameter Ellez Collector. Thus, wastewaters that were previously discharged to the environment without treatment are now transferred to existing Eskihisar Wastewater Treatment Plant. Those configurations are delineated in Fig 3.5 schematically. The area where the works will be done by WB credit is also schematically shown in this figure and the detailed design of the collection system (drawn in AutoCAD) is given in Fig.3.6. 
Figure 3.5 Schematic representation (main collectors) of wastewater system in Denizli Planned and completed pipe investments of Denizli Sewer System are summarized in Table 3.1. In addition to the numbers given in the Table 3.1 the city has a total of 360.5 km pipeline, which were constructed by the municipality and the public. As can be seen from the Figure 3.5 limited amount of raw wastewater from the downstream of the Bagirsak collector is being discharged to the receiving media (creeks). The use of raw wastewater in the creeks in agricultural fields is vague (unsure), and in fact illegal. However, regarding the project area that will be rehabilitated by WB credit, no wastewater is discharged to the receiving water without treatment because the wastewater is conveyed to the Eskihisar wastewater treatment plant - WWTP (see Fig 3.5). In the Denizli Sewer System Implementation Project approved in 1986, construction of a wastewater treatment plant-WWTP at Eskihisar neighborhood was proposed to treat the collected wastewaters of the city of Denizli. Within this scope, a 16 ha area was expropriated near the village of Eskihisar. Eskihisar (Central) WWTP was designed to be constructed in two phases aiming to serve the population in 2005 and 2025. Wastewater is transferred to the plant via the 1600 mm diameter Ellez Creek Collector. Construction of the plant, which was designed for the population estimates of the year 2005 has been completed in March 2007 and the plant is currently operational. It comprises of mechanically cleaned bar racks, aerated grit chambers, primary sedimentation, mechanically (surface) aerated activated sludge units, and final sedimentation tanks. Sludge generated from the process is thickened by gravity thickeners and stabilized by anaerobic digesters. The same units will be duplicated as the second phase, when the inflow increase and reach the ultimate capacity in coming years (most likely at 2025). Treated wastewater is planned to be used for irrigation purposes. Thus, the treated wastewater is discharged (via 2.5 km collector) to the State Hydraulic Works Left Bank Irrigation Canal. Table 3.1 Planned and completed investments within the scope of Denizli Sewer System Projects approved in 1986 and 2001.
* Completed Besides the Eskihisar WWTP, wastewaters being collected in the Bagirsak Creek Basin was planned to be transferred to a treatment plant that was proposed to be constructed in Gokpinar Creek Valley. However, route of the collector line had to be changed in order to collect the wastewaters originating from Bozburun Industrial zone and Bozburun village and the treatment plant was decided to be constructed in Asagi Samli region. This new treatment plant was also planned with a stepwise construction (for two design periods) that would serve the needs of the population in years 2020 and 2035. The capacity of the first phase was planned to be 100,000 inhabitants (638 l/s) and the ultimate capacity was designed to be 170,000 (1031 l/s). The plant is designed to operate on a classical activated sludge principle and wastewaters would be transferred to the plant via 1200 mm diameter Bagirsak collector. A connection will be made from Eskihisar WWTP to Asagi Samli WWTP in order to facilitate bypass Eskihisar WWTP when it is needed (see Fig.3.5). 
Figure 3.6 General lay out of the wastewater collection system that will be renewed by WB credit. .
A moderately old storm water drainage system made of reinforced concrete exists in Denizli that serves a limited area within the city. Location and characteristics of these systems are presented in Table 3.2. Since the existing system is insufficient, a new storm water drainage system has been designed for the area shown in Fig. 1.1. The design has been prepared by Kaynak Engineering Inc. in 2008. The collectors of this system are planned to be Ø400, Ø500, Ø600, Ø800 and Ø1000 mm in diameter and are designed according to the technical guidelines of the Bank of Provinces. The pipe material will be HDPE. The project design specifies that these pipes should be constructed by the elastic materials that would comply with the standards set in the “Pipeline Infrastructure Disaster Regulation” (published in the Official Gazette dated 15.02.2007 and numbered 26435) so that the pipeline would react elastically to any ground movement, would be repaired quickly and easily, would be elastic in manhole connections, would not be influenced by ground subsidence and would be of non-corrosive material. The meteorological data used in the project is obtained from the Denizli District of State Meteorological Organization. The precipitation data is used in order to illustrate the intensity - duration –occurrence curves from which design flow is computed. According to the project, a total of 31,439 m storm water drainage pipeline will be laid in Denizli (Center). The general view of the stormwater drainage project is given in Fig. 3.7. As far as the construction is concerned, stormwater drainage system is not different from wastewater collection system. This similarity is also valid in the operational phase of both systems. Table 3.2 Location and characteristics of existing stormwater drainage system of Denizli
Figure 3.7 General lay out of the storm water drainage system that will be constructed by WB credit. Directory: curated curated -> Concept stage curated -> Concept stage curated -> Republic of Côte d'Ivoire Urbanization Review curated -> Report No: aus11011 Central America curated -> Report No. 94474-pk fiscal Disaster Risk Assessment Options for Consideration curated -> Environmental and Social Management Framework for the Costa Rica Telecommunications Sector Modernization Project curated -> Environment Impact Assessment For Jiangxi Shangrao Sanqingshan Airport Beijing Guohuantiandi Environmental Technology Development Center. Ltd. Oct. 2012 Content curated -> Growth through Innovation An Industrial Strategy for Shanghai By Shahid Yusuf Kaoru Nabeshima April 22nd, 2009 curated -> Report No: 70178. People's Republic of China Download 0.5 Mb. Share with your friends:
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