Table 4 Forecasts of erosion volumes, roadside maintenance volumes and damaged agricultural surfaces, and direct costs for the total road network of the watershed assuming constant annual indexes and exponential roads increase trend
From: Rural earthen roads impact assessment in Phewa watershed, Western region, Nepal
Year | Total watershed earthen road network length (km) | Cumulative value for erosion event volume release (m3) | Damaged areas | ||
|---|---|---|---|---|---|
Cumulative value for volume to remove or repair (m3) | Cumulative value for agriculture land lost surface (m2) | Cumulative value for cost of damaged areas with Mixed maintenance (USD) | |||
2014 | 310 | 166982 | 46835 | 89445 | 117287 |
2015 | 318 | 167732 | 47130 | 90096 | 118165 |
2016 | 328 | 168732 | 47524 | 90965 | 119337 |
2017 | 354 | 171307 | 48539 | 93202 | 122355 |
2018 | 382 | 174087 | 49634 | 95617 | 125612 |
2019 | 412 | 177088 | 50816 | 98224 | 129128 |
2020 | 445 | 180327 | 52092 | 101038 | 132924 |
2021 | 480 | 183823 | 53469 | 104075 | 137020 |
2022 | 518 | 187597 | 54956 | 107353 | 141442 |
2023 | 559 | 191670 | 56561 | 110891 | 146215 |
2024 | 604 | 196067 | 58293 | 114711 | 151366 |
2025 | 652 | 200813 | 60162 | 118833 | 156927 |
2026 | 703 | 205935 | 62180 | 123283 | 162929 |
2027 | 759 | 211465 | 64358 | 128086 | 169408 |
2028 | 820 | 217433 | 66710 | 133271 | 176401 |
2029 | 885 | 223875 | 69247 | 138867 | 183949 |
2030 | 955 | 230829 | 71987 | 144908 | 192097 |