Pengaruh Sistem Drainase Berwawasan Lingkungan terhadap Debit Limpasan pada Daerah Penyangga Kota Mataram : The Effect of an Environmentally Drainage System on Runoff Discharge in the Buffer Area of Mataram City

Muh Bagus  Budianto; I Wayan  Yasa; Agustono  Setiawan; Hartana Hartana

doi:10.29303/jstl.v9i3.557

Authors

Muh Bagus Budianto Teknik Sipil Fakultas Teknik Universitas Mataram
I Wayan Yasa Teknik Sipil Fakultas Teknik Universitas Mataram
Agustono Setiawan Teknik Sipil Fakultas Teknik Universitas Mataram
Hartana Hartana Teknik Sipil Fakultas Teknik Universitas Mataram

DOI:

https://doi.org/10.29303/jstl.v9i3.557

Keywords:

runoff discharge, infiltration wells, increased runoff

Abstract

Mataram as the capital of West Nusa Tenggara Province has attracted people to live in it. The small city of Mataram makes the surrounding area a buffer area for rapid development. This condition can be seen from the increase in housing around Mataram City. This increase in housing area causes a reduction in water catchment areas. So during the rainy season there is an increase in runoff. The aim of the research is to determine the effect of an environmentally friendly drainage system on the amount of runoff discharge. The data required is land use data, rainfall, location maps and soil data. Rainfall data is used for Intensity Duration Frequency (IDF) analysis. IDF curves and land use data are used for runoff discharge analysis. Soil data is used to determine permeability which is used to determine of the discharge of infiltration well. Next, analyze the effectiveness of infiltration wells as an environmentally friendly drainage system. The results of the research show that there has been an increase in residential area over the last 10 years by 58% in Labuapi District, the southern part of Mataram City, 25% in Lingsar District and 29% in Gunungsari District, which is in the northern part of Mataram City. Changes in land use resulted in an increase in runoff discharge of 21% in Labuapi District, 8% in Lingsar District and 15% in Gunungsari District. An infiltration well with a diameter of 1 m and a depth of 1 m can absorb 1.13 m3 of water in the southern part and 1.21 m3 in the northern part of Mataram City. If every 100 m2 of residential area there is one infiltration well, then the effectiveness of the infiltration well in reducing flood runoff is 17.71% in Labuapi District, 15.61% in Lingsar District and 23.35% in Gunungsari District.

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