A master drainage plan for subdivisions is a comprehensive and systematic document that outlines the overall strategy for managing stormwater and drainage within a subdivided area. This plan is an essential component of the subdivision design process, addressing the potential impact of increased impervious surfaces and altered land use patterns on local drainage systems.
The master drainage plan typically includes an analysis of the existing topography, soil conditions, and hydrological features of the area. It outlines a network of stormwater management facilities, such as retention or detention basins, swales, and other drainage structures, to control and mitigate stormwater runoff.
The plan considers factors such as the size and intensity of rainfall events, potential flooding areas, and the protection of downstream water bodies. Additionally, it may incorporate best management practices for erosion control and sedimentation. The goal is to ensure effective stormwater management, prevent flooding, minimize erosion, and protect water quality within and downstream of the subdivision. Approval from relevant regulatory authorities is often required to implement the master drainage plan as part of the overall subdivision development.