SW6241002_Stormwater Narrative_20241118

M E
MARSH ENGINEERING
SERVICES
Powder Horn Subdivision Storm Water Narrative
The subject site is currently undeveloped. The proposed development of this site
includes single family residential lots along with associated roadways and potable
water infrastructure. Stormwater is to be collected into the proposed roadway ditching
and conveyed off site.
The site meets the qualifications of a low density development. The average density for
the development is 1.13 units/acre compared to the maximum of 2 units/acre to satisfy
the requirements set forth by NCDEQ. Stormwater will sheet drain across lots and
collect into roadway ditching along all proposed streets. The current basic existing
drainage patterns will be maintained throughout the site. Stormwater that is
discharged into existing wetlands on-site will be discharged at non-erosive velocities.
Culvert pipes will be installed where necessary to convey stormwater across proposed
roadways. The roads in the subdivision are designed in accordance with NCDOT
standards.
Based on our study and review of the NCDEQ BMP manual and 15A NCAC 02H .1000,
Powder Horn Subdivision meets and/or exceeds the requirements and intent for low
density development.