Reductions in runoff for the buffer strips with different
vegetation
Discharge data for all treatments spanning the entire monitoring period
(2017-2020) are presented graphically in Figure 3 and summarised on an
annual basis in Table 3. In the case of the grass buffer strip
treatment, the reduction in runoff (Table 4) compared with the control,
ranged from 5% (2018-2019) to 64% (2019-2020). The corresponding
efficacy for the willow buffer strip treatment (Table 4) ranged from
25% (2018-2019) to 67% (2019-2020). For the deciduous woodland buffer
strip treatment (Table 4), the reductions in runoff, compared with the
control, ranged from 42% (2018-2019) to 52% (2019-2020). For the
entire monitoring period (2017-2020; Table 4), reductions in runoff were
in the descending order: willow buffer strips (49%) >
deciduous woodland buffer strips (46%) > grass buffer
strips (33%).