20221460 Ver 1_Stormwater Narrative_20221020

Moxy Hotel Raleigh — STORMWATER NARRATIVE
Prepared by Brian O'Kane, PE of O'Kane & Associates
The site will be designed to meet and exceed the minimum stormwater management requirements
established by the City of Raleigh. The City of Raleigh requires that the site must provide stormwater
management for the proposed development. The new development must comply with the following
criteria:
• Nitrogen loading must be below 10.0 Ibs/acre/year.
• The post -development discharge from the site shall be less than the pre -development
discharge for the 2-year, 24-hour storm and the 10-year, 24-hour storm.
• Stormwater management devices should be designed in accordance with the NC BMP
Manual
Runoff will be collected and conveyed to a pre-treatment device such as a sand filter or stormwater
filtering device to promote the removal of sediment (total suspended solids) and nutrients through
media filtration. The use of permeable pavers throughout the hardscape will also promote nutrient
treatment and peak flow reduction. Ultimately, the peak flow rate will be reduced utilizing an
underground storage system before the flow is discharged into the City of Raleigh Storm Sewer System.
No runoff from the new impervious surfaces will be discharged into the buffer or stream.
October 17, 2022