Due to the acute water scarcity, the consumption of water resources to serve our daily purposes has gone crucial. An ingenious way for rainwater harvesting can help all modern town planners make design arrangements for harvesting rainwater through specific and sustainable methods. It is vital to reduce the line water or the reclaimed water used for domestic and other daily processes. Rainwater Harvesting (RWH) is not a new technique, but it can be altered with engineered and contemporary approaches to create a maintainable and eco-friendly parameter which would ensure availability and sustainable management of water and sanitation for all - SDG6. Herein an attempt has been made to visualize the concept of core cut method via FLOW-3D on the roof top that would not only focuses on the storage of water but also mitigates urban flooding and reduces the heavy amount spent on floor cleaning, flushing toilets, etc. © 2022 IEEE.