Tahtali Dam
From Past to Future
Hatice Yağmur KALKINÇ
Doruk Can MUTLU
About Project
Autumn Term 2018
We are undergraduate students in civil engineering at Ä°zmir Kâtip Çelebi University and this website was prepared for Water Resources Management course. Our advisor is Dr. Sedat YALCINKAYA.
We wanted to bring together some of the teachings of this class and our observations from our technical trip to Tahtali Dam. So we decided to make our term project about Tahtali Dam.
The purpose of this project is to evaluate the future sufficiency of Tahtali Dam for Ä°zmir.
About Tahtali Dam
Tahtali Dam is the largest drinking water resource of Izmir. The dam is located on the Tahtali Creek, 5 km east of Gümüldür r, 40 km south of Ä°zmir City Center. The construction of Tahtali Dam was completed in 1996 by State Hydraulic Works (DSI). The dam started to supply water to Izmir on August 27, 1997 .
Importance Of Tahtali Dam
Izmir is the 3rd most populous city in Turkey. It has a population of 4,279,677 with an annual growth rate of 13.2‰ according to 2017 population census .
With this rapid growth, the drinking water demand increases significantly. The average daily water use in the center in 2010 was 517,258 m³. According to Izmir Water Authority 2010 records, 40% of drinking water resources is surface water. 36% out of this 40% surface water comes from Tahtali Dam which makes Tahtali Dam critical crucial for Izmir .
(*The present value, %32 in 2018, was considered in the calculation.)
Methodology
Historical Data
Historical population data between 2000 and 2017 was taken from TÜÄ°K . We developed an equation for the estimation of future population based on the trend in historical data. We chose the power regression to obtain the largest R² value. In this way, our population estimation will be more accurate.
Calculated Data
With the help of our equation, we calculated the population up to 2050. The population was calculated to be 6,728,853 in 2050.
Results and Discussion
Precipitation Data
In spite of the constant population increase, there is a reduction in WUPC values after 2006. This sudden reduction took our attention. When we looked for possible reasons which might cause this reduction, we found out that there was less precipitation during that time period . Even though the storage in reservoirs decreased, there was no water shortage in Ä°zmir with the help of water saving campaigns and renewal of water distribution networks.
Water Demand Estimation for Ä°zmir
We only had water consumption values between 2004 and 2010. This was the only available data after the renewal of water distribution networks. We wanted to calculate the water demand for the next 35 years. The annual total water demand values were calculated by multiplying WUPC and estimated populations.
Water Demand Estimation for Tahtali
Because Tahtali Dam supplies water for only 32% of the population in Ä°zmir, water demand for Tahtali was calculated by multiplying WUPC with 32% of estimated populations.
Water Demand Analysis Based on the Dam Capacity
In our calculations, the critical value is (Average Potential Amount of Water can be withdrawn from the dam) 128,000,000 m³/year.
To examine the future sufficiency of the dam, we compared this value with our estimated water demand for Tahtali.
-A.P.A.W can be withdrawn from the dam: 128,000,000 m³/year
-Volume at minimum water elevation: 19,600,000 m³
-Volume at maximum water elevation: 306,650,000 m³
WHAT IF?
​
What if, Tahtali is the only drinking water resource of Ä°zmir?
-A.P.A.W can be withdrawn from the dam: 128,000,000 m³/year
-Volume at minimum water elevation: 19,600,000 m³
-Volume at maximum water elevation: 306,650,000 m³
Conclusion
According to our analysis, Tahtali Dam can sufficiently supply drinking water by 2045 for South Ä°zmir, which is home to one third of Izmir's population, as long as there is enough precipitation.
References
Contact Us
