1395 Figure 7: Drainage Pattern for Khadia opencast project, NCL based on Drone Survey. Source: Northern Coalfields Limited (2024). Major Monsoon Preparation Activities: To combat the challenges posed by monsoons, the following activities are undertaken: 1. Sump Preparation: Construction or deepening of sumps of adequate capacity to collect rainwater and surface runoff. These sumps act as primary water reservoirs for dewatering operations. Typical sump preparation and pontoon-mounted pumping arrangements adopted at Khadia Opencast Project are shown in Figure 8. 2. Pumping Infrastructure: Installation and maintenance of high-capacity pumps to ensure timely evacuation of water from mine pits and low-lying areas, thus avoiding work disruptions (Figure 8). Figure 8: Sump Preparation and Pontoon with high capacity pumps. Source: Northern Coalfields Limited (2024). 3. Benching of Overburden (OB) Dumps: Proper benching and stabilization of OB dumps are carried out to prevent erosion and sliding during intense rainfall. This also aids in systematic drainage. 4. Carpeting and Maintenance of Haul Roads: Main haul roads are graveled or carpeted to prevent waterlogging and ensure safe and smooth movement of heavy machinery and dumpers.
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