“The WfW Programme has made no provision for routine project monitoring or evaluation in relation to ecological responses to alien clearing. Even research in this regard is scant. Currently performance is measured on alien clearing efficiency (hectares cleared) rather than on degree of vegetation recovery. Without measuring the impacts of clearing, managers have no idea whether they are using the optimal approach, degrading or improving ecological integrity” - WfW External Evaluation (2003).
- Meijninger & Jarmain (2014) assessed the impact that invasive alien plants, and the clearing therof by WfW, has on the availability of water resources in the Western Cape and KwaZulu-Natal provinces
- Le Maitre et al. (2012) simulated and quantified the effects of plant invasions on land-cover, hydrological soil characteristics and catchment responsiveness on flow regulation using a hydrological model
- McConnachie et al. (2012) evaluated the cost-effectiveness of Working for Water in reducing invasive alien plant cover in the Krom and Kouga river catchments over 7 years
- Van Wilgen et al. (2012) assessed the effectiveness of the Working for Water programme over the past 15 years, by reviewing data from three national-level estimates of the extent of invasion, records of the costs and spatial extent of invasive species control operations, assessments of the effectiveness of biological control, and smaller-scale studies.
- Hope (2009) investigated the viability of relating annual river yields to remotely sensed changes in vegetation cover in a large mountainous fynbos catchment
- Dye and Jarmain (2004) reviewed relevant available information on rates of evaporation from black wattle and from grasslands and fynbos shrublands
- Dye et al. (2001) concluded that the removal of riparian wattle and its replacement by indigenous herbaceous plants may result in significant reductions in annual evapotranspiration, and could very likely lead to streamflow enhancement
- Prinsloo and Scott (1999) describe the changes in streamflow following the removal of invasive wattle from riparian zones during the dry summer months in three small catchments in the Western Cape
- Dye and Poulter (1995) conduced a field demonstration of the effect on streamflow of clearing invasive pine and wattle trees from a riparian zone