Performance of Retarding Basin in Flood Disaster Risk Mitigation in Welang River, East Java Province, Indonesia

Prorida Sari(1*)

(1) Agency of Public Works and Water Resources, East Java Province, Surabaya
(*) Corresponding Author


Flood phenomenon caused by high rainfall and sea tides on a watershed seat the tidal area, including the Welang River, commonly occur and the number of events is increasing. Construction of retarding basin is one of flood risk mitigation efforts by reducing the flood peak discharge. Assessment of flood management in Welang River was conducted with hydrology and hydraulic approaches, by using the Hydrologic Engineering Centre-Hydrologic Modelling System (HEC-HMS) 4.0 and Hydrologic Engineering Center–River Analysis System (HEC-RAS) 5.0.3 software. The hydraulic simulation consists of 4 scenarios. Scenario 1 was the current condition, while scenario 2, 3, and 4 were the retarding basin construction with one side spillway, one on the upstream (River Station (RS) 7400), on the middle (RS 6970), and on the downstream (RS 6590), respectively. The height variation of side spillways are 3 m and 4 m. Flood routing simulation result showed that the existing river channel condition could not accommodate of 2-year flood and 10-year flood, which caused peak discharge of 497.7 m3/s and 794.9 m3/s. At the RS 6590, the maximum runoff height of 2-year and 10-year flood were 0.66 and 1.02 m, respectively. Under the 2-year return period of flood, the discharge reduction caused by the retarding basin at control point RS 5341.4 (Karangketug Village), were 39.63 m3/s, 31.83 m3/s, and 41.93 m3/s, respectively for scenario 2, 3 and 4 with the 3 m side spillway height and 14.71 m3/s, 16.76 m3/s, and 13.74 m3/s, respectively for scenario 2, 3 and 4 with the 4 m side spillway height.


Welang River; retarding basin; side spillway

Full Text:



Ayalew,Tibebu B;Krajewski, Witold F;Mantilla, F, 2015. Insights into Expected Changes in Regulated Flood Frequencies due to the Spatial Configuration of Flood Retention Ponds. J. Hydrol. Eng., 20(10).

Brunner, G. W., 2016. HEC-RAS, River Analysis System Hydraulic Reference Manual. Davis, CA, USA: USACE, Hydrologic Engineering Center, HEC.

Chow, V. T., Maidment, D. R. & Mays, L. W., 1988. Applied Hydrology. USA: McGraw-Hill, Inc.

Feldman, A. D., 2000. Hydrologic Modelling System HEC-HMS, Technical Reference Manual. Davis, CA, USA: USACE, Hydrologic Engineering Center, HEC.

Istiarto, 2014. Simulasi Aliran 1-Dimensi Dengan Bantuan Paket Program Hidrodinamika HEC-RAS. [Online]
Available at:
[Accessed 18 November 2016].

Milly, P. C. D.; Wetherald, R. T.; Dunne, K. A.; Delworth, T. L, 2002. Increasing risk of great floods in a changing climate. Nature, 415(6871), pp. 514-517.

PT.Raya Konsult, 2012. SID Pengendalian Daya Rusak Kali Welang Kabupaten Pasuruan, Surabaya: BBWS Brantas.

Safii, I., 2010. Pengaruh Perletakan Kolam Retensi Terhadap Banjir. Yogyakarta: Universitas Gadjah Mada.

Shahapure, S S; Eldho, T I; Rao, E P, 2011. Flood Simulation in an Urban Catchment of Navi Mumbai City with Detention Pond and Tidal Effects Using FEM,GIS, and Remote Sensing. J. of Waterway, Port, Coastal, Ocean Engineering, 137(6), pp. 286-299.

Sujono, J., 2014. Petunjuk Singkat Aplikasi HEC-HMS versi 4.0, Yogyakarta: Universitas Gadjah Mada.

Verstraeten, G., and Poesen, J. , 1999. The nature of small-scale flooding,muddy floods and retention pond sedimentation in central Belgium.. Geomorphology, 29(3-4), p. 275–292.

Yuwono, N., 1977. Hidrolika I. Yogyakarta: PT. Hanindita.


Article Metrics

Abstract views : 2002 | views : 2385


  • There are currently no refbacks.

Copyright (c) 2022 The Author(s)

The content of this website is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
ISSN 5249-5925 (online) | ISSN 2581-1037 (print)
Jl. Grafika No.2 Kampus UGM, Yogyakarta 55281
Email :
Web Analytics JCEF Stats