Comparison of Projection and Maximum Flood Occurrences

The impact of submergence area in projected year will be huge because more than 690 Ha of settlement will be totally covered by seawater in 2021, more than 887 Ha in 2026, and more than 1,549 Ha in 2031. So that with ±649 Ha of building and it surrounding that will covered permanently in 2021, ±846 Ha in 2026 and ±857 Ha in 2031. That just the landuse which utilized by human primarily, not secondarily to fulfill their need. Complete properties that will be covered permanently by sea water in next 10, 15, and 20 years can be seen in table 4.6. Table 4.6. Properties that affecting by sea level rises in next 10, 15 and 20 years LANDUSE TYPE PERMANENTLY COVERED IN 2021 Ha PERMANENTLY COVERED IN 2026 Ha PERMANENTLY COVERED IN 2031 Ha Pond 56.931 70.330 70.828 Freshwater Pond 19.422 30.047 26.695 Shrub 1.007 3.427 4.067 Embankment 1963.705 2189.845 2261.841 Building 649.750 839.375 849.582 Estuary forest 4.382 4.382 4.382 Planting Area 6.603 11.863 16.586 Settlement 690.709 887.013 1041.101 Marsh 1.441 7.689 11.876 Grassland 144.079 185.738 196.264 Irrigated Farming Area 83.595 116.255 133.112 Moor 5.444 11.367 17.199 ROAD TYPE PERMANENTLY COVERED IN 2021 m PERMANENTLY COVERED IN 2026 m PERMANENTLY COVERED IN 2031 m Bridge 337.669 372.875 372.875 Flying Bridge 36.282 109.393 109.393 Collector Road 0.000 0.000 0.000 Other Type of Road 3550.602 4237.698 10474.163 Local Road 209000.660 265832.597 301876.894 National Road 2645.821 5214.808 5374.192 Footpath 5440.494 6157.219 6366.315 When spring tide occurrence comes in next month of those each specific year, the impact of sea level change will be hugher than only by sea level rise and impacted area will be expanding. Spring tide in next 10 years Jan-2022 will increasing sea level and can reach 1.27 m above zero. With this level of sea surface, the land area that will be impacted will reach ±5,059 Ha with all of it landuse properties, infrastructure facilities road, and water channel. Spring tide in next 15 years Jan-2027 will increasing sea level and can reach 1.40 m above zero. With this level of sea surface, the land area that will be impacted will reach ± 5,581 Ha, covering ± 429 km of road, and ± 306 km of water channel. The ilustration of inundated area in next 10, 15 and 20 years can be seen in figure 4.11 Figure 4.11. Projecting inundated area in next 10, 15 and 20 tears from now