Projects

DH Environmental typically provides input to a wide range of projects having an aquatic component. In addition DHEC also routinely undertakes a variety of wetland projects, water quality assessments, water quality modelling, training and empowerment ventures, project and proposal reviews (reviews include post-graduate examinations and supervision of candidates preparing for M.Sc and Ph.D level qualifications at various SA universities) and workshops.

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    Cilmor Industrial Park (Kuils River, Cape Town)

    This project undertook an Aquatics Constraints Analysis of a 63 ha site alongside the R300 expressway. The project identified limited constraints to the proposed development layout, all of which could readily be integrated into a modified design. The project was undertaken in association with Muller Environmental, CREO Geological and Blue Science.

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    International School (Broadlands, Somerset West)

    The proposed development of a new branch of the International School required that this site be assessed for the presence and delineation of wetlands. The characteristics of the site are compromised by an artifiically-elevated floodline and decades of agricultural modification. The project was undertaken in association with Muller Environmental, CREO Geological and Blue Science.

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    Driftsands Nature Reserve (Cape Town)

    The formalization of the Human Settlements Project within the Driftsands Nature Reserve required an evaluation of more than 100 wetland habitats. These were then assessed in terms of the impacts likely to be associated with the project. This project was undertaken in association with Muller Environmental.

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    Uitkamp (Durbanville, Cape Town)

    This project required the assessment and characterization of a streamline, dams and wetland occurring on the Uitkamp Farm on the eastern slopes of the Durbanville Hills. The findings indicated that the stream corridor could be integrated into the development virtually undisturbed, with a road crossing through the corridor being located on an existing dam wall.

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    Coral Lagoon (Milnerton, Cape Town)

    The proposed Coral Lagoon development, located alongside the Kleine Stink River (Diep River Catchment) is constrained by the artificial and degraded condition of the existing stream alignment. This stream flows through an area of extreme surface and groundwater pollution. The stream capacity is also undersized for flood management by a factor of 4. It is proposed that the developer be allowed to construct a new section of river, over a distance of 800 meters, to divert the stream past the affected area. This will then allow for the focussed management of pollutant sources along the original alignment. Project undertaken in association with Muller Environmental.

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    Malgas River (George)

    This project assessed the impacts of a pipeline offtake from the Malgas River, north of George, to the George Dam. The project was undertaken in association with Blue Science.

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    Richmond Business Park (Milnerton)

    This site has been extensively-modified through soil "borrowing" and the dumping of solid waste. While any semblance of natural aquatic environments has been lost through mining of the soil to the clay underlayer, the site contains some useful 'naturalized' wetland features that can be integrated into the development planning. Project undertaken in association with Muller Environmental.

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    De Plaat (Velddrif)

    The proposed De Plaat development is located on the northern shore of the Berg River (lagoon zone). This project was tasked with the derivation of an ecologically-based development line beyond which development would be disallowed. DH Environmental, in association with Muller Environmental, formulated a provisional line based on aquatic and botanical aspects. This line was then workshopped on site together with botanical and faunal specialists, and deemed to be accurate.

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    Parklands (Tableview)

    This development site contains a large area of saline ephemeral pan environments. DH Environmental, in association with Muller Environmental, assessed and mapped the wetland environment and formulated a protective buffer zone for its future protection.

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    Berg River Sustainable Utilization Plan (Berg River Dam, Franschhoek)

    During 2009 DH Environmental continued its previous (2008) involvement with the development of a multi-faceted user-oriented plan for the area surrounding the new Berg River Dam.

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    Van Wyks River (Paarl)

    This project, undertaken in association with Blue Science, evaluated the options for the containment of flooding within the lower reaches of the Van Wyks River (Berg River Catchment), in order to allow development.

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    Bridge House School (Franschhoek)

    The expansion of sporting facilities for the Bridge House School complex, downstream of the Berg River Dam, required the assessment of streams and wetlands on or adjacent to the site. DH Environmental was able to formulate a workable balance between the existing environments and the proposed sportsfields and allied infrastructure.

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    Waterford (Cape Town)

    This site required the verification of a floodline and river buffers for a small development alongside the Diep River Canal. Undertaken in association with Muller Environmental.

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    Erf1453 (Franschhoek)

    This property was assessed for the presence of wetlands prior to development. The site is located below a capped wastesite and no wetland environments were found. Undertaken in association with Muller Environmental.

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    Driftsands Sewer (Cape Town)

    The formalization of the settlements within the Driftsands Nature Reserve necessitates the construction of a sewerline alongside the Old Faure Road. Several wetlands and two river crossings are affected and were integrated into the proposed mitigation plan. It was found that the laying of this new line provided a means to formalize and protect the wetlands from the impacts typically associated with unmanaged roadside edges.

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    Genadendal (New Dam)

    DH Environmental was contracted to assess the site of a proposed irrigation dam on the farm Ezeljacht (Genadendal District). The dam was found to be sited well away from a protected environment and that it would not preclude any movement of biota via the stream to the uplands.

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    Urban Lakes Article

    DH Environmental was asked to contribute an article on the ecological associations and impacts allied to urban lakes.

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    Oudekraal Development (Twelve Apostles, Cape Town)

    This project is examining the development options available for the well-known Oudekraal site. DH Environmental provided the aquatics specialist input to this multi-disciplinary study. Undertaken in association with Muller Environmental.

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    Montague Park (Milnerton)

    This site contains the re-directed Duikersvlei wetland system. For this project DH Environmental determined the treatment capacity necessary to manage stormwater runoff from the developed site.

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    Watergate (Mitchells Plain)

    For this project DH Environmental continued its 2008 input to the assessment of the Watergate A property alongside the R300 expressway.

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    Gordons Bay Mall

    DH Environmental assessed and made recommendations for the integration of existing aquatic environments into the layout of the proposed Gordons Bay Mall.

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    Sitari Golf Estate (Faure, Cape Town)

    In association with Muller Environmental, DH Environmental assessed several aquatic environments on this property, as part of a pre-development Constraints Assessment.

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    Cape Farm (Phesantekraal)

    For this project DH Environmental assessed the impacts of illegal infilling into a river channel and made recommendations for rehabilitation and future management of the affected environment.

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    Review: Outeniqua Wetlands Assessment

    DH Environmental was appointed by BKS Consulting Engineers to undertake a review of an assessment of wetlands extant in the Outeniqua Catchment east of George.

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    Erf 17974 (Blue Downs, Cape Town)

    This Constraints Assessment did not find any aquatic environments on this site.

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    Erf 1879 (Blue Downs, Cape Town)

    This Constraints Assessment revealed several wetland environments occurring on this site.

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    Flooding Assessment (Greyton)

    This project undertook an assessment of issues of ecological relevance pertaining to the repair and remediation of flooding damage at several locations in the town of Greyton.

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    Cape Town International Airport

    Planned future development of the northern area of the CTIA required checking the site for wetlands. The site was found to contain a unique Cape Flats wetland in good condition - requiring that the proposed development be amended accordingly.

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    Erf 90136 (Fish Hoek, Cape Town)

    This site was subjected to a routine screening for the presence of aquatic environments.

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    Langebaan Mixing Study

    DH Environmental, in association with Seaways, was contracted to undertake a mixing study for the disposal of wastewater effluent into the Langebaan Lagoon.

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    Farm Uitkomst (Klapmuts, Cape Town)

    For this project, DH Environmental undertook an evaluation of, and made recommendations for, the re-alignment of a diverted stream back to its original course.

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    Royal Palms Development

    DHEC has undertaken an evalutation of the condition of, and opportunites for, a large man-made wetland at the Royal Palms Development in Paarl.

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    Annandale aquatic environments assessment

    DHEC is undertaking an assessment of aquatic environments at Annandale, east of Rietvlei, Cape Town.

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    Tygerfalls Limnology Evaluation

    DH Environmental has been commissioned to undertake a baseline evaluation of the limnology in the Tygerfalls Lake, Durbanville.

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    Ornamental Pond Designs

    DHEC is busy with design specifications for ornamental ponds.

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    Kuils River Wetland Assessments

    DHEC has been appointed to undertake various wetland assessments along the course of the Kuils River, Cape Town.

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    Waterhof Bird Sanctuary

    We have been involved with the rehabilitation of the Waterhof Bird Sanctuary since 2004 and have completed a re-appraisal of the remarkable progress being made at this site.

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    PPC Riebeek West Mine and Factory Expansion.

    DHEC, together with Envirowise and Blue Science, has undertaken an aquatic ecosystems assessment of the PPC property at Riebeek West. This assessment is in support of the planned 100-year expansion of this mining facility.

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    Durbanville Stormwater Retention Pond

    DH Environmental is providing specialist input to the augmentation of semi-natural wetland and pond features for a stormwater retention pond at a new development in Durbanville, Cape Town.

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    Devonvale Wetland Assessment

    DHEC, in association with Envirowise, recently undertook a wetland assessment at the Devonvale Estate (Stellenbosch).

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    Rosendal Wetland Assessment

    DHEC, together with Bergwind Botanical Consultants, recently completed a wetland assessment at Rosendal (Malmesbury, Western Cape).

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    Artificial Waterbodies, Queensland, Australia

    DHEC recently funded and undertook an assessment of challenges facing and options for the creation of artificial waterbodies in Queensland, Australia.

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    Emirates Hills, Dubai

    DH Environmental has completed a baseline limnological assessment, inclusive of recommendations for rehabilitation and future management, for 73 lakes at Emirates Hills and Living and Arabian Ranches in Dubai.

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    Berg River Dam: Sustainable Utilization Plan

    DHEC has been appointed by TCTA and Chittenden Nicks de Villiers to undertake the aquatic ecosystem component of the Sustainable Utilization Plan for the catchment of the Berg River Dam. This is one of the first studies of this kind undertaken in South Africa.

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    Upgrade of Malmesbury Wastewater Treatment Works

    DHEC was appointed by Shands Consulting Services to undertake an assessment of the impact of upgrading the Malmesbury WWTW on the Diep River.

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    Erinvale Residential and Golf Estate

    DHEC has been commissioned to undertake a 10-year review assessment of the water features on Somerset West's landmark golf estate. This assessment aims to identify options for augmenting the functioning and visual appeal of the many ponds and dams on the estate. DHEC undertook the first such assessment undertaken at Erinvale in January 1997.

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    Century City

    DHEC, in association with Ian Morrison Consulting, has been commissioned to undertake a water quality modelling and management assessment at Century City (Cape Town) to underpin ecosystem augmentation and long-term management goals. DHEC has been associated with Century City since 1996.

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    Berg River Dam

    DHEC is providing management support and guidance to the Trans Caledon Tunnel Authority for wetland and environmental management at the Berg River Dam project (Franschhoek).

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    Rehabilitation of Paardevlei

    During the past three years DHEC has prepared the way for the largest whole-lake rehabilitation project yet undertaken in South Africa. DHEC, with an involvement at Paardevlei starting in 1992, has until completion of our work in February 2007 provided lead-in specialist support, assessments and re-designed the vlei ahead of its transformation from a dam back to a semi-natural environment. Fish eradication and sediment removal phases have been completed. 2007 will see the transformation of the shorelines and vlei floor and perhaps a partial refilling of the vlei for the first time since rehabilitation commenced in 2005. An automatic weather station has been installed to inform water demand planning for the critical long-term management operation. This was a challenging project given the likely extreme-fragility of this artificial lake environment

    Download article on the dredging of Paardevlei

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    Ceres Golf Estate, Housing and Hotel Development

    DHEC, in association with the Freshwater Consulting Group, recently undertook an EIA-level assessment of the Dwars River and several tributaries around the town of Ceres - this as part of an assessment supporting planning for a suite of developments for this area.

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    Knysna River Ecological Reserve

    DHEC is part of the BKS(Bellville)-led team appointed to manage the undertaking of an ecological reserve assessment for the Knysna River.

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    Kuils River/N1 erosion assessment

    DHEC in association with Bergwind Consulting is providing input to a rehabilitation-directed assessment of erosion damage to the upper Kuils River in Cape Town.

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    Liesbeek River, Cape Town

    In association with Shands Consulting Services DHEC recently undertook a stream stability and rehabilitation needs-assessment for a reach of the upper Liesbeek River in Cape Town.

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    Rehabilitation and ecosystem augmentation for Lake Michelle, Noordhoek

    Expansion of this development required the retro-fitting of additional lake and wetland elements, eco-corridors and planning for the restructuring of the lake foodweb.

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    Rehabilitation assessment and planning for Hartbeespoort Dam (North West Province)

    Hartbeespoort Dam is commonly regarded as one of the world's worst hypertrophic environments. Completed in 2004, a multi-discipline Joint Venture led by DHEC compiled a comprehensive rehabilitation plan for this dam - based on a large-scale restructuring of the lake fishery, designed to offset negative pressures on the foodweb.

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    Olifants-Doring River System: Ecological Reserve Determination.

    DHEC undertook the water quality component of this major ecological assessment project. Additionally DHEC reviewed the predictive water quality outcomes for the Department of Agricultures Olifants-Doring “WODRIS” project.

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    Century City wetland and canal system (Cape Town)

    Century City is South Africa's signature development integrating a working wetland, canal system and business park. DHEC was responsible for the wetland and operational water quality design and has recently facilitated a management workshop to highlight necessary rehabilitation upgrades.

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    Silvermine Flood Management Scheme

    This unique, award-winning development entailed the design of a multi-stage wet/dry wetland for the Silvermine River.

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    Mapping of the wetlands of the Breede River and Riviersonderend Valleys

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    Use of rotenone for the eradication of problem fish from a large vlei.

    DHEC recently devised and managed the complete eradication of 36 tonnes of carp from a 45 ha vlei, the largest single use of a piscicide for lake rehabilitation yet undertaken in South Africa. Uniquely, DHEC applied the piscicide using a helicopter converted to a “crop-sprayer” configuration.