Estimating Water Availability using the SCS-CN Method based on Long Term Hydrologic Simulation and the Geographic Information System
Water is one of the main resources for sustainable city development. To ensure the availability of adequate water for human use, water resource managers need to estimate the amounts of water that enter, pass through, and leave individual watersheds. This is a challenge, because the relative magn...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Universitas Indonesia
2019-10-01
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| Series: | International Journal of Technology |
| Subjects: | |
| Online Access: | http://ijtech.eng.ui.ac.id/article/view/2716 |
| Summary: | Water is one of the main resources for
sustainable city development. To ensure the availability of adequate water for
human use, water resource managers need to estimate the amounts of water that
enter, pass through, and leave individual watersheds. This is a challenge,
because the relative magnitudes of the transfers of individual components in
the hydrologic cycle can vary greatly. This paper analyses water availability
estimation using the modified Soil Conservation Service Curve Number (SCS-CN)
model. The model provides a hydrologically sound procedure to better represent
capture behaviour. The study focuses on upper catchments located in West Java,
Indonesia. Water availability estimation from this catchment area is needed to
understand changes in river flow, as it constitutes information for the
Indonesian Regional Water Utility Company (Perusahaan Daerah Air Minum
(PDAM) Tirta Pakuan) in meeting the clean water needs of Bogor city. The
existing SCS-CN model determines the Curve Number (CN) variable using
Antecedent Moisture Condition (AMC). Daily moisture storage is updated based on
varying the curve number and other hydrologic abstractions. A model was used to
estimate stream flow components, direct-surface runoff, base flow, and
hydrological abstractions. The calibration results indicate good model
performance, with R2 and Nash Sutcliffe efficiency values for
simulated monthly data of 0.62 and 0.36, respectively. The model was also
successfully validated in the upper Cisadane catchment area by the respective R2
and Nash Sutcliffe efficiency values of 0.65 and 0.42. Validation of the model
indicates that it reasonably simulates the catchment response and is suitable
for use as a tool in estimating water availability. From these estimates, and
in accordance with the data used, it can be concluded that the level of water
availability can still meet Bogor's water needs from 2004-2009. |
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| ISSN: | 2086-9614 2087-2100 |