Town of Cary

NCDEQ Stormwater Design Manual (Town uses State MDC; LDO 4.4.6)

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Cary adopts NCDEQ Stormwater Design Manual MDC for SCM design; local LDO/engineering details not separately ingested. Pipeline excerpt repair removed 4 unlocated citation(s).

Fields not found in document: design_criteria.peak_flow_calculation_method, design_criteria.required_hydrologic_hydraulic_software, document_metadata.jurisdiction_level, document_metadata.adoption_or_effective_date, document_metadata.last_revised_date, document_metadata.relationship_to_state_manual

Other manuals in North Carolina: Charlotte-Mecklenburg, City of Asheville, City of Concord, City of Durham, City of Gastonia, City of Greensboro, City of High Point, City of Raleigh, City of Wilmington, City of Winston-Salem, North Carolina Department of Environmental Quality (NCDEQ), North Carolina Department of Transportation (NCDOT)

Document Metadata

Jurisdiction level

Not found in document

No evidence cited

State

North Carolina

“North Carolina”
NCDEQ

Version / edition

Revised: 1-3-2017

“Revised: 1-3-2017”
C-0

Adoption / effective date

Not found in document

No evidence cited

Last revised date

Not found in document

No evidence cited

Relationship to state manual

Not found in document

No evidence cited

Design Criteria

Design storm return periods (years)

10-year

“The outlets of SCMs shall be designed so that they do not cause erosion immediately downslope of the discharge point during the peak flow from the 10-year storm event as shown by engineering calculations.”
GENERAL MDC 4: EROSION PROTECTION, Page 3

Water quality volume method

Combined design volume of all SCMs must handle the required storm depth for the applicable stormwater program (depth varies by rule). Example: Rule 15A NCAC 02H .1021(6) requires a one-inch storm depth for runoff treatment in non-coastal HQW and ORW management zones. Design volume accounts for build-out runoff from all surfaces draining to the system; off-site drainage may be bypassed. Volume calculation methods are in Part B of the full manual (not in this chapter).

“The combined design volume of all SCMs on the project shall be sufficient to handle the required storm depth... Rule 15A NCAC 02H .1021(6) requires that for projects designed to achieve runoff treatment, the required storm depth is one inch for non-coastal HQW and ORW management zones.”
GENERAL MDC 1. SIZING, Page 2

Peak flow calculation method(s)

Not found in document

No evidence cited

Hydrologic/hydraulic software

Not found in document

No evidence cited

Approved BMP categories

Infiltration systems, Bioretention cells, Permeable pavement, Vegetated swales, Level spreader-filter strips, Berms, SCM-specific devices per Rules 15A NCAC 02H .1051–.1062 (Part C)

“Some SCMs that allow water to infiltrate include: infiltration systems, bioretention cells, permeable pavement, and depending upon native soils, vegetated swales, level spreader-filter strips, and berms.”
GENERAL MDC 2: CONTAMINATED SOILS, Page 2