HydroAsia Final Presentation

2010 team Purple Reducing Flood Damage by Increasing Green Area

2010 team Purple subcatchments Runoff coefficient: Between 0.7 and 0.8 Area almost totally impervious – 0.8

2010 team Purple subcatchments Runoff coefficient: Between 0.3 and

2010 team Purple  Increase of green areas (Bioretention cells,vegetation), with depression storage  Increases well-being and quality of life of the city's inhabitants, environmentally friendly  Possibility to use low impact development also, new technologies.

2010 team Purple  Green parking design : utilizing alternative pavers in overflow parking areas ◦ Depression storage 1.5mm ◦ Capillary suction: 10 mm ◦ Manning’s N: 0;03  Permeable pavement : allows stormwater to drain through the porous surface to a stone reservoir underneath. The reservoir temporarily stores surface runoff. 10% of total area = m 3 storage

2010 team Purple -Incheon Gyo Watershed -Method

2010 team Purple

Triangular Irregular Network Contour Manholes Raster Building and Road Layers Digital Elevation Model

2010 team Purple

Water level B.C Hydrograph based on runoff RainfallImperviousness Catchment area Surface Water level Discharge: Q DEM→Roads Roads+Storage Routing Sewage network Water level Discharge Q BasinManhole Sewer pipe flow FLOOD AREA Hydrological Model Hydraulic Model

2010 team Purple MIKE ZERO DEM MIKE 21 Simulating the surface flow Simulating the sewer network flow MOUSE Results

2010 team Purple Sewer Network Checking

2010 team Purple Here!

2010 team Purple

Flood in Incheon Gyo 1997

2010 team Purple :Flood Area Impervious Area Distribution and Flood Area Distribution

2010 team Purple -Current Conditions -Landuse modifications

2010 team Purple  MIKE21: ◦ Manning Number: 32 →(at green area: 25) ◦ Rainfall: Aug :00am-6:00pm for all Catchments ◦ Tidal Data  MOUSE: ◦ Tidal Data at 3 Nodes(Outlets) ◦ Rainfall: Aug :00am-6:00pm for all Catchments ◦ Runoff Coefficient: 75%-80% (at Green Area: 45%)

2010 team Purple

Total Simulation Area: 33.95km 2

2010 team Purple Current Landuse Manning No.: 32 Total Simulation Area: 33.95km 2 : Flood Areas

2010 team Purple : Green Area Total “green area increase”: 3km 2 Total Simulation Area: 33.95km 2 : new urban environment technologies (pavements, roads)

2010 team Purple  MIKE21: ◦ Manning Number: Green Area: 25 Other Area: 32 ◦ Rainfall: Aug :00am-6:00pm for all Catchments ◦ Tidal Data  MOUSE: ◦ Tidal Data at 3 Nodes(outlets) ◦ Rainfall: Aug :00am-6:00pm for all Catchments ◦ Runoff Coefficient: Green Area: 45% Other Area: 75%-80%

2010 team Purple

: Flood Areas

2010 team Purple Flood Areas (Before Changing Landuse)Flood Areas (After Changing Landuse) : No Green Area added: flood area: 43.7ha (486cells) :With 336ha Green Area added: Flood area: 11.8ha (132cells)

2010 team Purple  What we achieved ◦ Built DEM from contours and manholes using ArcGIS ◦ Modeling Incheon catchment with Mike 21 ◦ Simulate sewer flow by MOUSE with many scenarios. ◦ Combine 2 DHI model: MOUSE and Mike 21 together. ◦ Studied the idea of increasing Green Area to reduce flood in Incheon.  What we got ◦ Good chance to study together with many students from different countries. ◦ Improved teamwork skill. ◦ Understanding the softwares: ArcGIS, Mike 21, Mike Flood, MOUSE…  For their help, special thanks to ◦ Professor Philippe Gourbesville - University of Nice Sophia Antipolis ◦ Professor Shie Yui Liong - National University of Singapore ◦ Professor Gye-Woom Choi - University of Incheon ◦ Anne Gaedeke, University BTU Cottbus

2010 team Purple