TWO RIVERS URBAN PARK SPECIALIST STUDY: MODELLING OF FLOOD MITIGATION OPTIONS ON THE SALT RIVER TASK 2 FINAL REPORT Prepared for: Western Cape Government in partnership with The City of Cape Town 22 March 2017 i This report was compiled by: Royal HaskoningDHV 163 Uys Krige Drive RHDHV House Tygerberg Office Park Plattekloof Cape Town 7500 Email:
[email protected] With contributions from the NM&A TRUP Project Team Melanie Attwell and Associates ii PROJECT NAME: TWO RIVERS URBAN PARK (TRUP) PROJECT NUMBER: DATE: REPORT STATUS: S174/14 22 March 2017 Draft Report CARRIED OUT BY: COMMISSIONED BY: Western Cape Government (WCG): Royal HaskoningDHV (Pty) Ltd (RHDHV) Department of Transport and Public Works (DTPW) Regeneration Programme in partnership with the City of Cape Town (CCT) Development and Facilitation Unit AUTHOR(S): CLIENT CONTACT PERSON: Peter Hirschowitz WCG Project Manager: Gerhard Gerber 021 483 2787
[email protected] CCT Stormwater Representative: Ben de Wet 021 4005036
[email protected] SYNOPSIS: A hydraulic model of the river and bulk stormwater network within TRUP and in the flood-prone area downstream was set up. Flood extents were plotted for the current situation with climate change, as well as for the proposed development and various flood mitigation options. The model showed that proposed development scenario 7, as well as infill of the River Club island would have little effect on flood levels and extents. Construction of a small stormwater detention facility at the M5 Office Park adjacent to Berkley Road can reduce the frequency of flooding of Berkley Road at the M5 interchange.