Table 12. Resource quality objectives for riparian vegetation categorized as B/C for the lower Palmiet River, Western Cape (modified from Boucher and Tlale 2000). For an explanation of the categories, please see Table 8. Riparian vegetation zone   Requirement for the lower Palmiet to be a B/C river   Comment         Aquatic   Aponogeton spp. and algae < 10% cover   Densities will increase if winter floods are not provided. Marginal   Sandy deposits colonized by herbaceous species, not shrubs or trees Rocky sills support sexually reproducing Isolepis digitata No bank collapse   If there are constant high flows, I. digitata will not reproduce, and if there are constant low flows, it will only reproduce vegetatively. Transitional   No bank collapse No invasion by woody exotic species     Dry   Native woody perennials dominate Alien invasive species limited to < 5 individuals/10 m² Post-fire recruitment dominated by woody native perennials   Present clearing of alien invasive trees must continue. General   No native riparian plant species should become extinct from the reach or dominate the community   Dramatic changes in species content and density should be explored and explained.