Abstract
Aquatic system quality degradation by urban runoff owing to the effect of increasing impervious cover due to urbanization is becoming a serious issue. Based on 2015 data, with total imperviousness more than 60% in aquatic system catchment area of Universitas Indonesia (UI) Campus, the aquatic system quality is in poor condition. Best Management Practices (BMPs) as the practical form of Low Impact Development (LID) concept are proposed to be implemented in the catchment area. The performance of BMPs implementation can be quantitatively assessed using System for Urban Stormwater Treatment and Analysis Integration (SUSTAIN) model developed by US Environmental Protection Agency. As a decision support system, SUSTAIN model as the extension of ArcGIS can be applied for placement of BMPs at strategic locations in urban watersheds. This study aims to find the suitable location of BMPs placement in nine sub-catchments of UI Campus aquatic system catchment area. The suitability criteria for placing structural BMPs comprise nine database layers including slope, soil type, urban land use, percent impervious, land ownership, roads, water table depth, stream location, and drainage area. The study shows that there are ten types of BMPs that suitable to be implemented in UI campus catchment area, while three types of BMPs are not suitable. Based on the validation analysis, the applicable result from SUSTAIN model is 18 of 20, or has 90 percent of trust.
Highlights
A decrease in the quality of aquatic systems due to rainwater runoff in urban areas as a result of the increasing extent of impervious cover (IC) due to urbanization has become a very serious problem
This study is conducted in 2 main steps, which are; (1) Suitability Analysis, to determine the type of Best Management Practices (BMPs) to be applied/placed in certain location within the Universitas Indonesia (UI) Campus Catchment Area (CA), and (2) Validation Analysis to ensure the result from the suitability analysis which will be cross checked with the actual condition in the field
The tool used for suitability analysis is BMP Siting Tools (BST) module on the SUSTAIN program which is an extension of the ArcGIS software
Summary
A decrease in the quality of aquatic systems due to rainwater runoff in urban areas as a result of the increasing extent of impervious cover (IC) due to urbanization has become a very serious problem. The relationship between IC and water quality mentioned that the quality of an aquatic system of a catchment area can be indicated based on the percentage of its impervious cover from total CA [3, 5, 7 - 9, 15]. Referring to that theory, based on 2015 data, with a total impervious cover of 60% [8] within the Catchment Area (CA) of the Universitas Indonesia (UI) [2, 8], Depok, its CA aquatic system is in a range of impacted and heavily damaged condition [8, 15]
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