SW3221203_Stormwater Narrative_20221216

NARRATIVE
McCanless Village is a single-family subdivision located in East Spencer, North
Carolina. This project includes the construction of erosion control measures, utilities,
asphalt, curb and gutter, and low -density stormwater management.
Stormwater management design follow High -Density standards for water treatment
and controlling peak attenuation based on the NC BMP Manual.
The Pre -Drainage areas consist of Pre-1, Pre-2.1, and Pre-2.2. This is due to the
existing outfalls located on the project site.
Pre-1 flows are analyzed against Bypass-1.
Pre-2.2 flows area analyzed against Bypass-2.2.
Pre-2.1 flows area analyzed against Post-2.1.
Post-2.1 flow is comprised of flows from the BMP and Bypass flow that have the same
limits as Pre-2.1.
Offsite flow that enters BMP that cannot be bypassed has been designed with an
assumed 70% future impervious area. This is based on the current zoning of 85-ED-1
in the Town of East Spencer Zoning Ordinance.
Gateway Design Group, PLLC