Analysis of Rainfall Characteristicsfor Flood Estimation in Way Awi Watershed
Keywords:Design rainfall intensity, flood hydrograph, flood peak, intensity distribution
This study investigates rainfall intensity distribution in Way Awi watershed located in Bandar Lampung, and how their impacts on flood peak and flood hydrographs. Hourly rainfall data is examined to obtain design rainfall intensity and rainfall intensity distribution at rainfall duration from three to eight hours. Rainfall-runoff model, i.e. Rational method is used to calculate flood peak while unit hydrograph method is used to develop flood hydrograph. This study shows that in Way Awi watershed 88.3% to 96.4% of 24-hour rain occurs in three to eight hour durations. In addition, rainfall with three hour duration generates the highest flood peak, followed by four hour duration rainfall. When rainfall duration and design rainfall intensity are the same but rainfall intensity distribution is different, generated flood hydrograph may have different flood peak magnitude and timing. Result of this study is useful for flood analysis and mitigation in Way Awi watershed.
Robinson, J. and Sivapalan, M., Temporal Scales and Hydrological Regimes: Implications for Flood Frequency Scaling, Water Resources Research, 33(12), 1997, pp. 2981–2999.
Arnaud, P., Bouvier, C., Cisneros, L., and Dominguez, R., Influence of Rainfall Spatial Variability on Flood Prediction, Journal of Hydrology, 260(1–4), 2002 , pp. 216–230.
Kusumastuti, D. I., Struthers, I., Sivapalan, M., and Reynolds, D.A., Threshold Effects in Catchment Storm Response and the Occurrence and Magnitude of Flood Events: Implications for Flood Frequency, Hydrology and Earth System Sciences, 11, 2007, pp. 1515–1528.
Viglione, A. and Blöschl, G., On the Role of Storm Duration in the Mapping of Rainfall to Flood Return Periods, Hydrology and Earth System Sciences, 13, 2009, pp. 205-216.
Yulius, E., Rainfall Analysis for Intensity Duration Curve of Bekasi Catchment, Bentang, 2(1), 2014, pp. 1-8.
Ilmiaty, R.S., Susanto, R.H., Setiawan, B., Suryadi, F.X., and Bonar, G., Drainage Effects of Sangkuriang Indah Residential Area on Condition Existing Drainage System in Watershed Borang River Palembang City, International Journal of Biological, Ecological and Environ¬mental Sciences (IJBEES), 1(4), 2012, pp. 154-158.
Fauziyah, S., Sobriyah, and Susilowati, Analisis Karakteristik dan Intensitas Hujan Kota Surakarta, Matriks Teknik Sipil, 2013, pp. 82-89.
Agustianto, D.A., Model Hubungan Hujan dan Runoff (Studi Lapangan), Jurnal Teknik Sipil dan Lingkungan, 2(2), 2014, pp.215-224.
Susilowati and Kusumastuti, D.I., Analisa Karak-teristik Curah Hujan dan Kurva Intensitas Durasi Frekuensi (IDF) di Propinsi Lampung, Rekayasa, 14(1), 2010, pp.47-56.
Kusumastuti, D.I., Hydrology Analysis for the Johor River Using Synthetic Unit Hydrograph Gama I, Rekayasa, 13(3), 2009, pp. 219-228.
ASCE - American Society of Civil Engineers, Design and Construction of Urban Stormwater Management Systems, ASCE Manuals and Reports on Engineering Practice No.77 and Water Pollution Control Federation Manual of Practice RD-20, New York, 1992.
Young, C., McEnroe, B., and Rome, A., Empi¬rical Determination of Rational Method Runoff Coefficients, Journal of Hydrology Engineering, 14(12), 2009, pp.1283–1289.
Triatmodjo, B., Hidrologi Terapan, Beta Offset, Yogyakarta, 2008.
Bappeda Bandar Lampung, Bandar Lampung Spatial Plan, Bandar Lampung, 2010.
BMKG Panjang, Rainfall Data, Bandar Lampung, 2015
Kusumastuti, D.I. and Jokowinarno, D., Time Step Issue in Unit Hydrograph for Improving Runoff Prediction in Small Catchment, Journal of Water Resource and Protection, 4, 2012, pp. 686-693
Chow, V.T., Maidment, D.R., and Mays, L.W., Applied Hydrology, McGraw-Hill, New York, 1988.
Kusumastuti, D.I., Jokowinarno, D., Khotimah, S.N., Dewi, C., and Yuniarty, F., Infiltration Well to Reduce the Impact of Land Use Changes on Flood Peaks: A Case Study of Way Kuala Garuntang Catchment, Bandar Lampung, Indonesia, Hydrology and Earth System Sciences Discussions, 18, 2014, pp. 1–27.
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