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Economic Assessment of Subsidence in Semarang and Demak, Indonesia

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In the past decades, economic growth has stimulated industrialization and urbanization in Indonesian coastal cities such as Semarang and Demak. Against this backdrop of economic growth, water demand in Semarang and Demak has increased over time. However, clean (piped) water supply has not kept pace with rising demand, and industrial activities largely rely on direct groundwater extraction.
Extraction of groundwater is expected to be the key driver of subsidence in the area, particularly in locations situated on unconsolidated sediments like the northern part of Semarang and Demak. In a natural state, subsidence due to consolidation of such sediments rarely exceeds 1 cm/year. However, over-extraction of groundwater can significantly exacerbate subsidence rates: in Semarang and Demak, subsidence exceeds 8 cm/year in the northern part of Semarang, and in Sayung District of Demak. In areas where the groundwater head drops most strongly, subsidence is more severe. This subsiding area hosts the majority of industries and is densely populated.
Subsidence can cause immense direct and indirect damage. Direct damage includes damage to infrastructures and buildings. Indirect damage includes increasing flood risk due to lower elevation, over time leading to permanent land loss. Attention for this issue is increasing in the area, and a subsidence roadmap is in the making to help adapt and mitigate the land subsidence

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Ketersediaan — Departemen Perencanaan Wilayah dan Kota

Informasi Detail

Judul Seri

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No. Panggil

LP.13.2021

Penerbit

Jakarta : Deltares., 2021

Deskripsi Fisik

61p .; il .: 29cm

Bahasa

English

ISBN/ISSN

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Klasifikasi

LP.13.2021

Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

i

Subjek

Land subsidence

Info Detail Spesifik

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Pernyataan Tanggungjawab

Mila Mahya

Versi lain/terkait

Lampiran Berkas

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