**3.4 Implementation of erosion control plan**

The erosion control plan combined with other engineering measures (concrete blocks, gabions, and filling-ups) has been partially or completely implemented. **Figure 16** compares the aerial images of JiJi Weir in 2014 and 2021. In this 1.2 km

**Figure 16** *Aerial images of JiJi Weir.*

reach of JiJi Weir downstream, a comb weir structure, two drop structures, and some concrete blocks were installed. The head-cut development from 2014 to 2021 seems not very significant, which demonstrated the effectiveness of the erosion control plan.
