An Analysis on Green Areas and The Potential Of Irrigation Using Rainwater And Grey Water: A Case Study from The Megacity İstanbul


Beler Baykal A. B. , Gürsoy Ö. , Aksoy Y. , Samsunlu A.

in: CONTEMPORARY ISSUES IN ARCHITECTURE AND URBAN PLANNING: Architectural & Urban Forms, Yıldız Aksoy,Efe Duyan, Editor, Dakam Books, İstanbul, pp.5-20, 2021

  • Publication Type: Book Chapter / Chapter Research Book
  • Publication Date: 2021
  • Publisher: Dakam Books
  • City: İstanbul
  • Page Numbers: pp.5-20
  • Editors: Yıldız Aksoy,Efe Duyan, Editor

Abstract

Increasing population and urban sprawl in the last 50 years has lead to the reduction of urban green and

increase in water demand in the Turkish megacity Istanbul. As water resources of the megacity are limited,

finding alternatives to maintain continuity and sustainability is a main issue in the agenda and harvested rain

water and reclaimed grey water are two options. Atak.y is one of the neighborhoods with the most green

areas in Istanbul. Its green areas are irrigated by using municipal water supply between April and October.

This paper aims to present an overview of the change in urban green in the Atakoy neighborhood of Istanbul,

the potential and possibility of using rainwater and greywater for its irrigation, to provide an example to be

extended to elsewhere experiencing similar problems. First, irrigational water demand of Atakoy and its zones

was calculated, then rain water harvesting, and grey water collection potentials were estimated. A

comparison of the demand and the potential has revealed that 20% of the demand for green areas could be

provided from rain water, 79% from grey water on an annual basis. The combination of both rain water and

grey water can cover almost the entire demand. Zone 2 of Atakoy was observed to be the most effective for

collection of rainwater and second most effective for grey water. A preliminary analysis was performed for

storage in the zone with the highest potential (Zone 2) to suggest possible storage areas mostly under parking

lots. The results show that considerable water savings may be achieved through the use of that rain water

and grey water. These alternative water resources are valuable options that can aid the sustainability of water

resources and water services, and the potential for their use is motivating.