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FLOOD MODELLING OF KALU-GANGA RIVER BASIN H. K. Nandalal Department of Civil Engineering University of Peradeniya Peradeniya Sri Lanka.

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Presentation on theme: "FLOOD MODELLING OF KALU-GANGA RIVER BASIN H. K. Nandalal Department of Civil Engineering University of Peradeniya Peradeniya Sri Lanka."— Presentation transcript:

1 FLOOD MODELLING OF KALU-GANGA RIVER BASIN H. K. Nandalal Department of Civil Engineering University of Peradeniya Peradeniya Sri Lanka

2 Problems related to flooding have greatly increased over recent decades because of population growth development of extensive infrastructures in close proximity to rivers It is importance to find solutions by utilizing modern technology like Geographic Information Systems (GIS), Remote Sensing (RS) and flood modeling

3 Study area Data used Software used Application of Software HEC-HMS HEC-RAS ENVI

4 Kalu-Ganga river basin in Sri Lanka  Total catchment area is 2719 km 2  Entire basin lies within the wet zone.  Average annual runoff is around 7600 MCM.  Catchment experiences average annual rainfall of 4000 mm.

5  Study concentrates on the lower reaches of the river  Area of interest is nearly 500 km 2  This includes 5 Divisional Administrative Divisions (DSD)

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7 LIDAR DATA Contour Data TIN Model of the Study area

8 Locations of rainfall and discharge gauging stations

9 Raw Images (Dry Date, 03 March,2008) ALOS – PALSAR (HH) Raw Images (Wet Date, 03 June,2008) ALOS – PALSAR(HH) Satellite images

10 Data Collection and Data-basing…

11 Rainfall –Runoff Modeling

12 Basin model developed using HEC-GeoHMS

13 Results of the verification runs to compare the simulated flows and the observed flows of the calibrated HEC-HMS model

14 Flood Modeling

15 Geometric Data: HEC-GeoRAS export  Stream C/L  River banks  Flow paths

16 Discharge data obtained from HEC-HMS Elagawa Mawakoya Kuda Ganga Junction Kuda Ganga/Kalu Ganga Junction Mawakoya/Kalu Ganga Flow (m 3 /s) data at\Return Period 10yr20yr50yr100yr Elagawa Junction KudaGanga/ Kalu Ganga Mawak Oya Junction Mawak Oya/Kalu Ganga Kuda Ganga

17 HEC-RAS output

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19 Flood Hazard Maps from HEC-RAS

20 Raw Images (Dry Date, 03 March,2008) ALOS – PALSAR (HH) Raw Images (Wet Date, 03 June,2008) ALOS – PALSAR(HH)

21 Mask(Difference dB image Wet - Dry)

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