UKWIR/FRMRC Integrated Urban Drainage Model application in Torquay with 1D & 2D surface flow modelling 21st October 2009
Oct 03, 2015
UKWIR/FRMRC Integrated Urban Drainage
Model application in Torquay with 1D & 2D surface flow modelling
21st October 2009
Overview
Study Objectives Background Data Modelling 1D Modelling 1D/1D Modelling Imperial College 2D Modelling - Infoworks
Results Conclusions
Study Objectives
To apply and evaluate the new 1D surface flow model developed bythe FRMRC to support the better management of urban flooding. Application will be within a sub-catchment of Torquay, Devon as agreed with the Project Steering Group using selection criteria prepared by the FRMRC researchers.
Working with the FRMRC model developers, to identify any required improvements prior to the models being applied in further demonstration catchments.
Compare the results from the new 1D surface flow model with the results from the Infoworks CS 2D model.
Background: Torquay
Background: Torquay Flooding Locations
Background: Historic Flooding Locations
Market Street, Torquay - 1984
Background: Historic Flooding Locations
John Menzies Union Street, Torquay - 1986
Background: Major Flood Alleviation Schemes
Hele Tank
Ellacombe TankUpton Tank
Background: Recent Flooding Events
29th May 1999 24th October 1999 19th August 2000 20th August 2007
Background: Torquay - Dry Photos
Background: Flooding 1999
Fleetwalk/Union Street Flooding Movie- 1999
Background: Flooding 20th August 2007
Data: Data Collection
Sewer Records Mastermap Mapping Data Digital Terrain Data Aerial Photography Historic Flooding Records Rainfall Data Verified Hydraulic Model
Data: Lidar Ground Based
Data: Lidar Ground Based
Data: Lidar Ground Based
Data: Lidar Ground Based
Data: Lidar Merged Data
Data: 1D Modelling Ground Intensity Image
Data: 1D Modelling Integrated Model
Modelling
Base Model - 1D Model Enhanced Model - 1D/1D Model Integrated Model 1D/1D Model Infoworks 2D Base Model Infoworks 2D Integrated Model
Modelling: Base Model - 1D
Type 2 Model (WaPUG Guide) Originally Produced in 1993 Updated to include modifications
Modelling: Study Area
Modelling: Enhanced 1D/1D
Format Input Data for use with Imperial College Software Use Imperial College Software Produce Ponds Produce Pathways
Import Data into Infoworks Clean up data
Modelling: Enhanced 1D/1D - Input data
Data required
Modelling: Enhanced 1D/1D - Imperial College Software
Modelling: Enhanced 1D/1D - Infoworks data import
Modelling: Infoworks 2D
Base model + 2D mesh Integrated model + 2D mesh 2D Mesh 17,083 triangles based 11,263 vertices 12.43 ha max triangle area 10m2 min mesh element area 5m2 min angle 25 degrees
Modelling: Infoworks Coarse 2D Modelling
Coarse model bare earth (10 mins mesh) Coarse model with buildings (1 day mesh)
Results Infoworks 2D 24th October 1999
Results
Historic flooding locations replicated Overland flows accurately predicted in
both 1D & 2D models Depth of flooding under-predicted in 1D
model Graphical representation of 2D results
impressive
Conclusions
Objectives successfully completed Imperial Software required further
development No appreciable benefit between
Integrated and Enhanced model 1D rapid assessment tool Infoworks 2D preferred for design
solutions
UKWIR/FRMRC Integrated Urban Drainage OverviewStudy ObjectivesBackground: TorquayBackground: Torquay Flooding LocationsBackground: Historic Flooding LocationsBackground: Historic Flooding LocationsBackground: Major Flood Alleviation SchemesBackground: Recent Flooding EventsBackground:Torquay - Dry PhotosBackground:Flooding 1999Background:Flooding 20th August 2007Data:Data CollectionData:Lidar Ground BasedData:Lidar Ground BasedData:Lidar Ground BasedData:Lidar Ground BasedData: Lidar Merged DataData: 1D Modelling Ground Intensity ImageData: 1D Modelling Integrated ModelModellingModelling: Base Model - 1DModelling: Study AreaModelling: Enhanced 1D/1D Modelling: Enhanced 1D/1D -Input dataModelling: Enhanced 1D/1D - Imperial College SoftwareModelling: Enhanced 1D/1D -Infoworks data importModelling: Infoworks 2DModelling: Infoworks Coarse 2D ModellingResults Infoworks 2D 24th October 1999ResultsConclusions