Design Standards

Washtenaw County Water Resources Commissioner

Rules and Guidelines - Procedures and Design Criteria for Stormwater Management Systems

Pursuant to Section 105(c) of Act 591 of the Public Acts of Michigan of 1996, as Amended and The Michigan Drain Code Public Act of 1956, as Amended

August 6, 2014
Evan N. Pratt
Washtenaw County Water Resources Commissioner

Rules 2014 Cover

 
 
 
 

I.       INTRODUCTION

II.      PLAT AND PLAN SUBMISSION & REVIEW PROCEDURES

A.                   PURPOSE AND INTRODUCTION

B.                   CONCEPTUAL PLAN REVIEW REQUIREMENTS

C.                   PRELIMINARY PLAN SUBMITTAL AND APPROVAL

D.                   CONSTRUCTION PLAN SUBMITTAL AND APPROVAL

E.                    FINAL SUBDIVISION PLAT SUBMISSION AND APPROVAL

F.                    DRAINS UNDER THE JURISDICTION OF THE WATER RESOURCES COMMISSIONER

G.                   APPEAL PROCEDURES

III.    PERMIT  REQUIREMENTS  & REVIEW FEES

A.                   PERMITS

B.                   FEES

IV.   COMPUTATIONAL  REQUIREMENTS FOR STORMWATER MANAGEMENT SYSTEMS

A.                   PURPOSE AND INTRODUCTION

B.                   SIZING REQUIREMENTS – STANDARD METHOD COMPUTATIONS

C.                   COMPUTATIONAL REQUIREMENTS – STRUCTURAL CREDITS

D.                   COMPUTATIONAL REQUIREMENTS – NON-STRUCTURAL CREDITS OR “SELF-CREDITING” BMPS

E.                    STANDARD METHOD RUNOFF VOLUME WORKSHEETS

F.                    COMPUTATIONAL REQUIREMENTS – CONVEYANCE SYSTEMS

V.   DESIGN REQUIREMENTS FOR STORMWATER MANAGEMENT SYSTEMS

A.                   PURPOSE AND INTRODUCTION

B.                   DESIGN REQUIREMENTS – NATURAL WETLANDS AND FLOODPLAINS

C.                   DESIGN REQUIREMENTS – STORAGE FACILITIES

D.                   DESIGN REQUIREMENTS – INFILTRATION BMPs

E.                    DESIGN REQUIREMENTS – BIORETENTION SYSTEMS

F.                    DESIGN REQUIREMENTS – RAIN GARDENS

G.                   DESIGN REQUIREMENTS – POROUS PAVEMENT

H.                   DESIGN REQUIREMENTS – DRY WELLS

I.                     DESIGN REQUIREMENTS – STRUCTURAL INFILTRATION BASINS

J.                     DESIGN REQUIREMENTS – SUBSURFACE INFILTRATION BEDS

K.                   DESIGN REQUIREMENTS – INFILTRATION TRENCHES

L.                    DESIGN REQUIREMENTS – VEGETATED FILTER STRIPS

M.                 DESIGN REQUIREMENTS – BIOSWALES

N.                  DESIGN REQUIREMENTS – GREEN ROOF

O.                  DESIGN REQUIREMENTS – WATER REUSE

P.                   DESIGN REQUIREMENTS – CONVEYANCE SYSTEMS

Q.                  DESIGN REQUIREMENTS – LOT GRADING

VI.     AREAS OF SPECIAL CONCERN

VII.   SOIL EROSION, SEDIMENTATION & POLLUTION CONTROL

VIII.  APPENDIX

A.                  GLOSSARY

B.                  MAJOR CATEGORIES OF NON-POINT SOURCE POLLUTANTS AND ASSOCIATED IMPACTS

C.                  STORMWATER POLLUTANT HOTSPOTS

D.                  CONSTRUCTION, OPERATION AND MAINTENANCE OF CLUSTER WASTEWATER TREATMENT SYSTEMS,  COMMUNITY DRAIN FIELDS AND OTHER SANITARY TREATMENT FACILITIES UNDER THE MICHIGAN DRAIN CODE

E.                   ENGINEER’S CERTIFICATE OF CONSTRUCTION

F.                   EXAMPLE THREE STAGE OUTLET DESIGN

G.                  RAINFALL PRECIPITATION DATA

H.                  HYDROLOGIC SOIL GROUPS FOR WASHTENAW COUNTY

I.                    REQUIRED EASEMENT AND DISTRICT LANGUAGE FOR CHAPTER 18 DRAINAGE DISTRICTS

J.                   SAMPLE AGREEMENT FORM.

K.                   MAINTENANCE PLAN AND BUDGET

L.                   ENGINEER’S CERTIFICATE OF OUTLET

M.                  GENERAL GUIDE TO NATIVE PLANT SPECIES

N.                  LEGAL OPINION REGARDING NEED FOR EASEMENTS DOWNSTREAM OF DRAINAGE DISTRICT OUTLETS

O.                  ORDER OF ADOPTION OF RULES

 

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