Stream corridor restoration study on JUNJUNG river, PENANG / Jamil Matarul

Stream corridor restoration is a collective effort to return some of the damaged stream
ecosystems to their approximate pre-disturbance conditions. This research will depicts
a hydrologic engineering study carried out at Junjung River,Penang,Malaysia for
stream corridor restoration planning. Three test cases were analysed in this study to
meet the stream corridor restoration requirement specified in the urban stormwater
Management Manual for Malaysia. First condition is with no restoration, second
condition with cultivates shrubs and third condition cultivates with trees. HEC HMS
model was used to predict design flow for ARI 50 years and ARI 100 years due to
120 minutes 360 minutes design rainfall. Before predicted design rainfall some field
data will be collected to develop flow rating curve and historical hydrograph. Another
hydrograph was predicted by HEC-HMS, this predicted hydrograph was adjustment
until the predicted hydrograph match with historical hydrograph. This predicted
hydrograph (calibrated model) was validated with selected storm event in year 2005
to ensure the validity of the model to be used in the future planning. Roughness
coefficient due to vegetations (shrubs and trees) estimated using Fischenich’s
equation (2000). HEC-RAS model was used to predict the flood level for various
design condition stated above. Restoration with trees was proposed to be adapted for
stream corridor restoration planning.