City of Yonkers

New York State Stormwater Management Design Manual (adopted; applies in Yonkers)

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Municipality coverage via NYS Stormwater Management Design Manual (same pattern as Rochester). Pipeline excerpt repair removed 3 unlocated citation(s).

Fields not found in document: document_metadata.version_or_edition, document_metadata.adoption_or_effective_date, document_metadata.last_revised_date

Other manuals in New York: City of Albany, City of Buffalo / Buffalo Sewer Authority, City of Rochester, City of Syracuse, New York, New York City, New York State, New York State

Document Metadata

Jurisdiction level

City

“or other individual hired by the municipality Learn about the resources the local program has at its disposal. If government staff are being trained, develop a maintenance plan that is consistent with their knowledge and understanding. Be aware of equipment and materials o”
p. 323

State

New York

“DAM SAFETY SECTION 50 WOLF ROAD ALBANY, NEW YORK 12233-3507 --- page 369 --- GUIDELINES FOR DESIGN OF DAMS TABLE OF CONTENTS SECTION TITLE PAGE Preface to the January 1 1989 Edition 1 Introduction 2 Gravity Dams Modification 2 Definitions 3 3 Hazard Classification 5 4 De”
pp. 363–370

Version / edition

Not found in document

No evidence cited

Adoption / effective date

Not found in document

No evidence cited

Last revised date

Not found in document

No evidence cited

Relationship to state manual

adopts state manual directly

“urban stormwater runoff 2. To provide design standards on the most effective stormwater management approaches including: o Incorporation of runoff reduction achieved by infiltration, groundwater recharge, reuse, recycle, evaporation/evapotranspiration through the use of runoff”
p. 11

Design Criteria

Design storm return periods (years)

1-year, 2-year, 10-year, 100-year

“1-year, 2-year, 10-year, and 100-year”
Table 4.1

Water quality volume method

90% Rule: WQv (acre-feet) = (P * Rv * A) / 12, where Rv = 0.05 + 0.009(I)

“Water Quality Volume (WQv) 90% Rule: WQv (acre-feet) = (P ∙ Rv ∙ A) / 12 Rv = 0.05+0.009(I) I = Impervious Cover (Percent) P(inches) = 90% Rainfall Event Number (See Figure 4.1) 2 A = Contributing Area (acres) Runoff Reduction Volume (RRv) RRv (acre-feet) = Reduction of”
p. 43

Peak flow calculation method(s)

TR-55, TR-20

“TR-55 and TR-20 (or approved equivalent) shall be used to determine peak discharge rates.”
Section 4.6

Hydrologic/hydraulic software

USDA NRCS TR20, HydroCAD, Pond Pack, StormCAD, Hydraflow, HEC-HMS

“Hydraulic and hydrologic modeling software, such as USDA NRCS TR20, HydroCAD, Pond Pack, StormCAD, Hydraflow, and Hydrologic Engineering Center Hydrologic Modeling System (HEC-HMS) and others, shall be used”
Section 4.9

Approved BMP categories

Stormwater Ponds, Stormwater Wetlands, Infiltration Practices, Filtering Practices, Open Channel Practices

“Acceptable practices are divided into five groups, including: I. Stormwater Ponds... II. Stormwater Wetlands... III. Infiltration Practices... IV. Filtering Practices... V. Open Channel Practices”
Section 3.3.1