2.4.2.2 Total Worker
TW is defined as the number of all types of workers in the total population per sq km. Farming is the largest private-sector enterprise in India, where nearly 58.9% of the workers depend upon agriculture for their income and livelihood [33]. In the coal mining region, along with agriculture, various workers are also involved in mining or industrial activity (quarrying, transportation, blasting, etc.) for daily wages. These workers have direct interaction with the coal product (coal blocks, coal powder, coke, etc.) or wastes (mine spoils, coal ash, dust particles, etc.) causing serious impacts on their health. In the study area, Saunda, Patratu, Lapanga, Jainagar, Sirka, Dari, Labga, Koto, Terpa, etc., are the villages having a higher worker population (>252 workers/km2) (Figure 2.5b).
2.4.2.3 Children Age Group (0–6 years) (CAG)
The children in the age group 0–6 years are directly affected by hazards due to their negligible coping capabilities for survival during and post-disaster events. Saunda, Patratu Chaingara, and Sirka are the villages that have a higher number of children below ages (0–6) years (1,983–12,526 children/ villages) (Figure 2.5c). Close proximity to the coal mining area tendering children more vulnerable to diseases due to polluted air and water of the region. Water bodies associated with abandoned coal mines are the breeding ground for mosquitoes making children more vulnerable to malaria and other diseases in the area.
2.4.2.4 Literacy Rate
The LR represents the number of literate persons in an area. It helps residents to understand the nature of the hazard, its severity, and their response to information issued by disaster management authorities after an event struck. Therefore, areas with a high percentage of literates can be treated as a region with higher copping ability. These regions are assigned the lowest rating, whereas villages with the lowest LR are assigned a higher rating. The villages having LR >45% in the study area are Churchu, Patratu, Saunda, Sirka, Dari, Koto, Urimari, etc. (Figure 2.5d). Whereas, villages having lowest LR are Tokisud, Aswa, Potanga, Bicha, Chito, Jumara, Kori, etc. (Figure 2.5d).
2.4.3 Geo-Environmental Hazard and Socio-Economic Vulnerability Assessment
Coal mining hazard and SVI maps were developed using the above-mentioned models (Equation 2.1 and 2.2). The prepared raster layers of different parameters with their respective weights are added and divided by the number of parameters using the raster calculator tool of ArcGIS. The computed geo-environmental hazard and socio-economic vulnerability maps indicated the areas which are more prone to hazard and vulnerability (Figures 2.6 and 2.7).
2.4.3.1 Geo-Environmental Hazard Index
The geo-environmental hazard map was derived by combining AOT, PWV, temperature, and LU/LC of the study area. The computed hazard index indicates the areas, which are more prone to be hazardous (Figure 2.6). The range of index values for the geo-environmental hazard model (that uses four hazard parameters) is 3–13. Natural Breaks (Jenks) classification technique was used to divide the ranges into four zones such as low (3–5), moderate (5–7), high (7–9), and very high (9–13).
Figure 2.6 Composite geo-environmental hazard index map of the study area.
Figure 2.7 Composite socio-economic vulnerability index map of the study area.
The geo-environmental hazard map shows that about 13.93% and 18.93% of the area lie between very high and high hazardous zones and the remaining 43.28% and 23.86% of the area fall in the moderate to low hazardous zone (Table 2.2). The highly hazardous zones are present in the eastern and south-eastern parts covering an area of 125.27 km2 (Figure 2.6). A possible reason for highly hazardous prone regions is that they were attributed greater AOT and PWV concentration along with location of active coal mining and several sponge iron industries. The majority of the study area lies in the moderate hazardous zone (164.85 km2) that is in the central part of the region, whereas the lowest hazardous areas are mostly the forest and hilly areas (90.88 km2).
Table 2.2 Area statistics of socio-economic vulnerability index in study area.
| Socio-economic Vulnerability Zones | Area (km2) | % Area |
|---|---|---|
| Low | 32.84 | 8.62 |
| Moderate | 111.95 | 29.38 |
| High | 210.89 | 55.35 |
| Very High | 25.33 | 6.64 |
| Total | 381.00 | 100.00 |
2.4.3.2 Socio-Economic Vulnerability Index
A composite socio-economic vulnerability map was generated by integrating various village level socio-economic indicators such as PD, TW, children below ages (0–6) and LR in the study area (Figure 2.7). The ranges of index value of the socio-economic vulnerability model are 3–10 classified in four classes, low (3–4), moderate (4–5), high (5–8), and very high (8–10), respectively.
Maximum SVI villages in the study area lie in a highly vulnerable zones that comprises 210.89 km2 (55.35%) area, whereas 25.33 km2 (8.62%) areas lie in the lowest vulnerable zone (Table 2.3). The village Saunda is in a very high vulnerable zone due to a higher density of socio-economic indicators such as PD, workers and children below ages (0–6).
2.4.4