Time Step Issue in Unit Hydrograph for Improving Runoff Prediction in Small Catchments

Kusumastuti, Dyah Indriana; Jokowinarno, Dwi

doi:10.4236/jwarp.2012.48079

Cited by 6 publications

(4 citation statements)

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“…Unit hydrographs, either synthetic or instantaneous, have been intensively used to predict runoff in some studies. Such unit hydrograph is capable to improve runoff prediction [2], even in ungauged catchment [3][4][5] or gauged catchment [6], dealing with the parameters of the unit hydrograph to achieve a better runoff prediction [7], evaluating runoff prediction using unit hydrograph and physicallybased model [8]. A conceptual model such as a bucket model is not only capable to predict runoff in a catchment [9][10][11] but also in a catchment with lakes ( [12,13]).…”

Section: Introductionmentioning

confidence: 99%

“…Earlier studies on this catchment have investigated observed unit hydrograph [6] and rainfall characteristics of the catchment [16]. The previous study on this catchment [6] found that the average time to peak of observed unit hydrograph for Way Awi is 30 to 60 minutes while base time is 3 hours It is implied that when a flood comes, discharge rises rapidly and attenuates quickly. This is due to land use of the watershed which is covered mostly by impermeable areas.…”

Section: Introductionmentioning

confidence: 99%

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Rainwater Harvesting for Flood Peak Reduction in Way Awi Catchment, Indonesia

Jokowinarno¹

2020

GEOMATE

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This study is motivated by floodings which occur frequently in Jagabaya village, Way Awi catchment, Bandar Lampung city, Indonesia. In addition to the intensity of rainfall, this area is considered as an urban area with intense housing and insufficient drainage capacity during heavy rain. This study aims to analyze flood peak reduction by simulating the application of rain barrels for each house. The volume of rain barrels used in the simulation is 0.5 to 5 m 3 . An Intensity-Duration-Frequency (IDF) curve is generated using short-duration rainfall data (i.e. 5, 10, 15, 30, 60, 120, 180, 360 and 720 minutes) recorded from Panjang Meteorological Bureau, Lampung. The rational method, a simple rainfall-runoff model, is used to calculate runoff generated both from catchment and rooftop. The result shows that the application of rain barrels may reduce flood peak up to 28% for 2 year return period of flood, while for 100 year return period of flood, the reduction may reach 13.64%. From this study, it can be concluded that rainwater harvesting utilizing rain barrel is significant in reducing flood peak. Furthermore, this result can be used to persuade both the society as well as the local government to do such flood mitigation in this densely populated urban area.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rainwater Harvesting for Flood Peak Reduction in Way Awi Catchment, Indonesia

Jokowinarno¹

2020

GEOMATE

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“…Despite it categorization as a conservative method, the unit hydrograph remains a useful and practical approach to dealing with operational hydrological forecasting and rainfall-runoff modelling. Besides, this method can compute the predicted time to peak of runoff more accurately for time less than one hour (Kusumastuti & Jokowinarno, 2012).…”

Section: Introductionmentioning

confidence: 99%

Modelbuilder and Unit Hydrograph for Flood Prediction and Watershed Flow Direction Determination at The West Branch of The Little River, Stowe, Lamoille County, Vermont, USA

Silalahi

Hidayat

2020

Geoplanning: Journal of Geomatics and Planning

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The West Branch of the Little River in Stowe, Lamoille County, Vermont has been widely studied, and this area is regularly subject to flooding. The West Branch joins the Little River, which flows into the Winooski and drains into Lake Champlain. This area has undergone extensive development as an economic response to the ski resort industry over the past 50 years, and the recreational pathway is on the banks of the river. The Little River is adjusting to the loss of historic floodplain area, channel modifications (straightening and gravel mining), and runoff changes. In this project, a DEM with 10 and 30 meters resolution will be used to determine the watershed area for the outlet point at the south of Stowe for hydrological analysis. This project intends to describe the watershed flow direction with a unit hydrograph that shows when water discharge at the outlet is at its height during a rainfall event and produce the floods prediction map by predicting the nature of flood events to help in planning and responding to flood events effectively using ArcGIS Pro 2.0. The results show the time it takes water to flow to the outlet ranges from 0 seconds (rain that falls on the outlet itself) to over 8 hours and 46 minutes. The amount of water has accumulated, indicating that water will flow at its fastest when funneling toward the outlet point downstream of the town with no exception, indicating that water will flow at its fastest when funneling toward the outlet point downstream of the town.

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“…ITS-2 is the latest synthetic unit hydrograph model developed at the Sepuluh Nopember Institute of Technology (ITS) in 2017 (Tunas and Anwar, 2018 and .This model is the development of the previous similar models such as Snyder, Nakayasu and GAMA I, which have been widely applied in Indonesia (Kusumastuti et al, 2012 andSafarina et al, 2012), especially for designing hydraulic structures such as weirs, dams and flood canals. The main characteristic of this model is that the parameters are a combination of fractal characteristics and watershed morphometry and the hydrograph curve is a simple single equation.…”

Section: Introductionmentioning

confidence: 99%

The Application of ITS-2 Model for Flood Hydrograph Simulation in Large-Size Rainforest Watershed, Indonesia

Tunas¹

2019

J. Ecol. Eng.

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Nowadays, the increasing intensity of extreme rainfall and changes in land use have triggered massive floods in various regions of Indonesia. The changes in the characteristics of these two parameters cause an increase in the peak and duration of the flood over time. Peak and duration of flood estimation might be very useful for the national and local government because it is closely related to the effectiveness of prevention and mitigation plan in the future. A hydrograph-based model constitutes one approach to estimating them simultaneously. The objective of this research is to examine the application of ITS-2-a synthetic unit hydrograph (SUH) model which was developed at Sepuluh Nopember Institute of Technology (ITS) in 2017-for estimating the peak flood discharge as a basis for planning disaster mitigation programs. This study was carried out by testing the reliability of the ITS-2 Model using the Nash-Sutcliffe Efficiency (NSE) indicator by comparing the measured unit hydrograph and synthetic unit hydrograph derived using the model, optimizing the parameters of the model, and then analyzing the transformation of rainfall-flood discharge in the Gumbasa Watershed, one of the major watersheds in Central Sulawesi Province, Indonesia. This catchment is part of the Palu watershed, which is largely a tropical rainforest conservation area known as the Lore Lindu National Park. The input model is based on the design rainfall with a certain return period using the frequency analysis where the data was obtained from the rainfall stations in the study area. The results of the research showed that the performance of the ITS-2 model was still very good with the NSE above 80%. The difference in the peak discharge of these two unit hydrographs is relatively low, with a deviation below 10%. The optimal values of the ITS-2 Model parameter coefficients consisting of C 1 , C 2 , and C 3 were achieved at 1.29, 0.33 and 1.88, respectively. The results of the hydrograph analysis based on a 1-year to 100-year return period indicate that peak flood discharge ranges from 100 m 3 /sec to 550 m 3 /sec. From a series of analyses and tests that have been conducted in the previous and current research, it can be concluded that the ITS-2 Model can be applied to various watershed sizes, especially in Indonesia.

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Time Step Issue in Unit Hydrograph for Improving Runoff Prediction in Small Catchments

Cited by 6 publications

References 4 publications

Rainwater Harvesting for Flood Peak Reduction in Way Awi Catchment, Indonesia

Rainwater Harvesting for Flood Peak Reduction in Way Awi Catchment, Indonesia

Modelbuilder and Unit Hydrograph for Flood Prediction and Watershed Flow Direction Determination at The West Branch of The Little River, Stowe, Lamoille County, Vermont, USA

The Application of ITS-2 Model for Flood Hydrograph Simulation in Large-Size Rainforest Watershed, Indonesia

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