20231406 Ver 1_2600 Churchill Rd_Stormwater Narrative 8-15-23_20231016

CREDLE ENGINEERING COMPANY, INC.
ENGINEERING \ PLANNING \ LAND SURVEYING
"SERVING THE COMMUNITY SINCE 1920"
S TORMWATE R
NARRATIVE
INTRODUCTION
The proposed residence at 2600 Churchill Street, Raleigh, N.C. will be more in conformance to
the existing houses found in the neighborhood. This stormwater narrative will address the changes
from the existing residential house to the proposed residential house
IMPROVEMENTS
The improvements to the property for the new residence is a change in elevation for the new
residence. This will result in a retaining wall. The redeveloped impervious surface from the roof will
be directed via gutter drains to the low side of the proposed wall. The gutter drains will daylight into
a splash rock area and then drain over vegetation before entering the existing creek on the property.
The gutter drains have been designed to have a flow of less than 025 cfs for a peak flow during a
0.75 in/hr event (15a NCAC 02b.0714.9 option (b)(in)). The splash rock areas will dissipate the flow
and are of the Town of Chapel Dill design (see plans for specific details and sizing). The flow is then
directed over vegetated areas to the existing creek The redeveloped impervious surface of the
driveway and outside hardscape will be directed to landscape drains. The drains will daylight into a
splash rock area and then flow over vegetation before entering the existing creek on the property.
The landscape drains have the same design factors as the gutter drains. There will also be a grass
diversion ditch (15a NCAC 02b.0714.9 option (b)(ix)), for any run-off from the property to the east,
at a higher elevation, directed to the rear of the property and through vegetation before entering the
existing creek
DRAINAGE AREA & POINT OF DISCHARGE
The drainage area for this property and the points of run-off entering the existing creek will not
change from the existing residential house.
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