Van Wyk, D.B. (1987). “Some effects of afforestation on streamflow in the Western Cape Province.” Water SA.
The foundational peer-reviewed evidence base for the water-yield cost of pine invasion in South African fynbos catchments. Van Wyk documented a 55% reduction in streamflow in fynbos catchments 23 years after pine invasion. The finding remains the base rate cited across South African water-yield restoration economics and underpins the Greater Cape Town Water Fund’s business case.