City and County of Honolulu

Rules Relating to Storm Drainage Standards

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Compare each cited field to the official PDF before relying on it. What this means

Conveyance/hydrologic standards only. Water quality volume and LID BMP sizing are deferred to separate Rules Relating to Water Quality (not in this PDF). Pipeline excerpt repair removed 2 unlocated citation(s).

Fields not found in document: design_criteria.water_quality_volume_method, design_criteria.required_hydrologic_hydraulic_software, document_metadata.version_or_edition, document_metadata.last_revised_date

Other manuals in Hawaii: State of Hawaii Department of Transportation, Highways Division

Document Metadata

Jurisdiction level

City

“design of storm drainage facilities in the City and County of Honolulu”
Introduction

State

Hawaii

“Honolulu, Hawaii”
Title Page

Version / edition

Not found in document

No evidence cited

Adoption / effective date

2017-08

“This edition supersedes the Rules Relating to Storm Drainage Standards, January 2000 (Repealed August 16, 2017).”
Introduction

Last revised date

Not found in document

No evidence cited

Relationship to state manual

independent

“These standards have been prepared pursuant to Article 12, Chapter 14, Revised Ordinances of Honolulu, 1990 as amended”
Introduction

Design Criteria

Design storm return periods (years)

10-year, 50-year, 100-year

“For drainage areas of 100 acres or less, Tm (recurrence interval) = 10 years, unless otherwise specified.”
Part I.A.1, Page 1

Water quality volume method

Not found in document

No evidence cited

Peak flow calculation method(s)

Rational Method (Q = CIA) for drainage areas of 100 acres or less, Plate 6 Design Curves for Peak Discharge vs. Drainage Area (USGS flood-frequency / 100-year) for drainage areas greater than 100 acres

“For drainage areas of 100 acres or less, the rational method shall be used.”
Part I.B.1, Page 1

Hydrologic/hydraulic software

Not found in document

No evidence cited

Approved BMP categories

Closed conduits (storm drains), Open channels, Roadway culverts and bridges, Low impact development best management practices (per separate Rules Relating to Water Quality)

“C. CLOSED CONDUITS... D. OPEN CHANNELS”
Table of Contents / Part II