Presentation on theme: "Urban Water Management Towards water sensitive urban settlements – integrating design, planning and management of South Africas towns and cities K. Winter,"— Presentation transcript:
Urban Water Management Towards water sensitive urban settlements – integrating design, planning and management of South Africas towns and cities K. Winter, K. Carden, L. Fisher-Jeffes, & S.Pan Public input into the National Water Resource Strategy October 2012
2 Urban Water Management Urbanisation in SA, 1950 - 2030 Source: Haldenwang, 2010
3 Urban Water Management Water Sensitive Urban Design (WSUD) Multi-disciplined approach to urban water management aimed at managing the urban water cycle in a more sustainable manner so as to improve water security (Wong, 2006). Considers the environment in conjunction with infrastructure planning, design and management at the earliest possible stage of any decision-making process (McAlister, 2007).
4 Urban Water Management Influence of WSUD on the urban water cycle Source: Hoban & Wong (2006)
USE Potable water supply and treatment plant Hot water system Shower and bathroom taps Clothes washing Toilet flushing Garden irrigation Built environment Natural environment Built environment Human consumption - kitchen Discharge Sewage treatment plant (STP) Water treatment plant
REUSE USE Potable water supply and treatment plant Hot water system Shower and bathroom taps Clothes washing Toilet flushing Garden irrigation Built environment Natural environment Built environment Human consumption - kitchen MINIMISE PROTECT & ENHANCE ENVIRONMENT Discharge Stormwater treatment Train Sewage treatment plant (STP) All water is an opportunity Not a threat Discharge
7 Urban Water Management Descriptive understanding of WSUD …mitigating water scarcity, improving water quality, thereby protecting ecosystems, through the development of water sensitive urban areas (for all) that are sustainable, resilient and adaptable to change, while simultaneously being a place where people want to live….
8 Urban Water Management Narrative definition TermDefinition water sensitive A new paradigm that integrates new knowledge with the provision of water services and the protection of aquatic environments in urban areas urban areas…inclusive of residential, commercial or industrial purposes for allImplemented in all developments in an appropriate and fit- for-purpose manner resilient and adaptable Development that is able to withstand disasters and adjust to changes in environment, climate, population and social circumstances. a place where people want to live Where there is integration of the green and brown agenda - where amenity forms part of the planning and design; where ecosystems services are valued
9 Urban Water Management WSUD principles / strategies 1.Sustainable water supply options water conservation / demand management alternative water sources, e.g. rainwater / stormwater harvesting aquifer storage 2.Wastewater minimisation quality improvement use of treated wastewater / recycled water 3.Stormwater management SUDs (Sustainable Urban Drainage) enhancement of amenity and biodiversity
10 Urban Water Management WSUD transitions framework Cape Town Ethekwini Source: Brown et al. (2008)
11 Urban Water Management Green Point Park, Cape Town
12 Urban Water Management Sanitation Housing Solid Waste Water Supply Drainage And the ugly.
15 Urban Water Management WSUD transitions framework Source: Brown et al. (2008)
16 Urban Water Management RETRO FIT Water supply city Sewer City Drained city Water way City Water Sensitive city Un-service high density areas Apartheid/separate development Water cycle city Vision History GoalWhat we need to do now Develop water sensitive services The road ahead Develop water sensitive services Informal settlements Formal settlements Green fields WSUD in SA: 2 Historys, 1 future
17 Urban Water Management The Vision Component RETRO FIT Water supply communities Sewered communities Drained communities Apartheid/separated communities History Goal What we need to do now Develop water sensitive services The road ahead Informal settlements Formal settlements Green fields Develop water sensitive services Un-serviced, high density communities Needs Solutions Water Supply Supply Hydraulics Public Health Separate Sewers Need for cheap labour Allow the formation of informal settlements with no services Civil unrest/demand for equitable services Adhoc provision of services Flood Protection Channelization Amenity and environmental protection Water scarcity, public health Integrated Urban Water Cycle management (IUWCM), management of point source Management of diffuse pollution Limits on natural resources Fit for purpose use of water Inter- generational equity Adaptive, multifunctional infrastructure designed to emphasise water sensitivity Waterway Communities Water Sensitive Cities Water cycle communities
18 Urban Water Management Presentation of benefits of WSUD StakeholderArea of interest PoliticiansProvision of basic services; job creation City officialsCosts / ease of maintenance Private developersIncreased profit / public image Community groupsJob creation; public health / safety Environmental groupsProtection of environment IndividualsAdditional costs/ benefits per household
19 Urban Water Management Acknowledgements Water Research Commission of South Africa – Contract no. K5/2071: Water Sensitive Urban Design (WSUD) or Low Impact Design (LID) for improving water resource protection/conservation and reuse in urban landscapes