The environmental impacts and anthropogenic activities in the name of the development of water streams, like the construction of bridges, roads, and built-up areas across water drainage paths, disturb the natural flow pattern and give rise to inundation and flood disasters in low-lying areas. These phenomena are incredibly pronounced in the absence of concerted hydrological modelling and environmentally friendly construction materials while planning for construction in a river basin for flood prevention, hydromodifications or hydraulic structures. This study has endeavoured to conduct the hydrological study of one of the fastest-flowing rivers in the UK, ‘The Swale River’, as a projected case study to assess a projected 200-year rainfall/ storm event, statistical modelling for catchment level efficiency, discharge quantum, lag time, projected hydrograph analysis for extracted rainfall, runoff, discharge flow data and exceedance from existing 48 months rainfall/ runoff data. The potential impact of these findings on future construction projects is significant, as they can guide the development of more sustainable and environmentally friendly construction practices. The statistical modelling proposed a heavy 200-year flood of 360 m3/sec discharge for a catchment area of 1446 km2 and 118 km length, using a projected heavy flood event of 6 cm precipitation in 8 hours for Swale River to ascertain the formation of discharge in the river after a 6-8 hours lag time with 30% catchment efficiency. This hydrograph modelling gives detailed working for the requirement of flood protection and placement of rescue and relief operations in case of flooding caused by the overflowing of the river to stretch of 1-2 km along the channel having a water depth of 2-10 feet, likely to impact the life and properties.
ORCID: 
CORE (COnnecting REpositories)
CORE (COnnecting REpositories)