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Stormwater Master Plan

Table of Contents

List of Tables .............................................................................................
List of Figures (12.18 MB)............................................................................
List of Appendices ......................................................................................
List of Acronyms ........................................................................................
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Section 1: Executive Summary ...................................................................................................... 1-1
  1.1 Purpose ...........................................................................................................................
1.2 Study Area and Population .................................................................................................
1.3 Planning Projections ..........................................................................................................
1.4 Conveyance System Analysis .............................................................................................
1.5 UIC Evaluation ...................................................................................................................
1.6 Capital Improvement Program ..............................................................................................
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1-2
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Section 2: Introduction ................................................................................................................... 2-1

 

2.1 Background ......................................................................................................................
2.2 Authorization .....................................................................................................................
2.3 Purpose for Study ..............................................................................................................
2.4 Scope of Work .................................................................................................................
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2-1
2-1
2-1
Section 3: Study Area Characteristics ............................................................................................ 3-1
  3.1 General .......................................................................................................................... 3-1
    3.1.1 Economy ............................................................................................................ 3-1
  3.2 Existing Environment ........................................................................................................ 3-1
    3.2.1 Geography ..........................................................................................................
3.2.2 Topography .........................................................................................................
3.2.3 Geology ..............................................................................................................
3.2.4 Soils ...................................................................................................................
3-1
3-2
3-2
3-4
      3.2.4.1 Canderly Sandy Loam, (12A) ....................................................................
3.2.4.2 Latourell Loam Series (53A, 53B and 53C) ................................................
3.2.4.3 Amity Silt Loam (3) .................................................................................
3.2.4.4 McBee Silty Clay Loam (56) ....................................................................
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3-4
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    3.2.5 Groundwater Supplies ............................................................................................
3.2.6 Climate .................................................................................................................
3.2.7 Flooding (Risk Analysis) .........................................................................................
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  3.3 System Mapping ..............................................................................................................
3.4 Service Area and Basin Boundaries .....................................................................................
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    3.4.1 Storm Drainage Basins .......................................................................................... 3-8
      3.4.1.1 Canby Downtown ..................................................................................
3.4.1.2 N Baker Drive .........................................................................................
3.4.1.3 Knights Bridge Road ..............................................................................
3.4.1.4 Southwest Berg Parkway .......................................................................
3.4.1.5 N Maple Street .......................................................................................
3.4.1.6 Redwood/Willow Creek ............................................................................
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    3.4.2 Existing Stormwater System ................................................................................. 3-10
      3.4.2.1 Conveyance System ...............................................................................
3.4.2.2 Existing Drywells/UICs ............................................................................
3.4.2.3 Stormwater Management Structures .........................................................
3.4.2.4 Known Issues with the Existing System ....................................................
3-10
3-10
3-11
3-13
Section 4: Basis of Planning ........................................................................................................... 4-1
  4.1 Introduction .....................................................................................................................
4.2 Land Use and Development Area Projections ......................................................................
4.3 Flow Analysis ...................................................................................................................
4.4 Guiding Principles .............................................................................................................
4.5 UIC Retrofit Alternatives ......................................................................................................
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4-2
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4-2
Section 5: Conveyance System Analysis ......................................................................................... 5-1
  5.1 Introduction ........................................................................................................................
5.2 Conveyance System Model ................................................................................................
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    5.2.1 Conveyance System Assumptions ........................................................................
5.2.2 Model Subbasins ..................................................................................................
5.2.3 Additional Basin Characteristics ..............................................................................
5.2.4 Flow Generation Information ...................................................................................
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5-2
5-3
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  5.3 Hydraulic Criteria ................................................................................................................ 5-4
    5.3.1 Hydraulic Grade Line (HGL) Evaluation Technique ...................................................
5.3.2 Sizing Evaluations ...............................................................................................
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5-4
  5.4 Modeled Systems .............................................................................................................. 5-5
      5.4.1.1 Canby Downtown ...................................................................................
5.4.1.2 Canby Downtown CIP ..............................................................................
5.4.1.3 N Baker Drive ..........................................................................................
5.4.1.4 Knights Bridge Rd ..................................................................................
5.4.1.5 Knights Bridge Rd plus N Baker Rd ..........................................................
5.4.1.6 Knights Bridge Rd and N Baker Rd including NW 9th Ave............................
5.4.1.7 S Berg Parkway .....................................................................................
5.4.1.8 North Maple Street .................................................................................
5.4.1.9 Redwood/Willow Creek ............................................................................
5.4.1.10 N 10th Ave and N Pine St to NE Territorial Rd plus Redwood/Willow Creek ...
5.4.1.11 Redwood/Willow Creek plus N Pine St and N Redwood Rd New Development..
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  5.1 Water Quality Facility Sizing Criteria .......................................................................................
5.2 Existing Detention Pond Capacity ...........................................................................................
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    5.2.1 Detention Pond Capacity Analysis ........................................................................... 5-9
  5.3 Proposed Fish Eddy Wetland Sizing ........................................................................................ 5-10
    5.3.1 Treatment Wetland Drainage Basins ..........................................................................
5.3.2 Conceptual Treatment Wetland Size ..........................................................................
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5-11

Section 6: Capital Improvement Projects .......................................................................................... 6-1
  6.1 System Evaluation Approach .................................................................................................
6.2 System Evaluation Results ......................................................................................................
6.3 Estimates of Probable Cost ....................................................................................................
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6-1
    6.3.1 Pipe Costs ...............................................................................................................
6.3.2 UIC Decommissioning ................................................................................................
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  6.4 Project Prioritization ................................................................................................................
6.5 Project Implementation............................................................................................................
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6-2

  6.5.1 N Baker Dr. CIP #1 ..................................................................................................
6.5.2 10th Ave. from N Locust St. to N Pine St. CIP #2 .......................................................
6.5.3 SE Hazeldell Way CIP #3 ........................................................................................
6.5.4 SW 13th Ave near Canby High School CIP #4.............................................................
6.5.5 UIC E-8 and E-11 Decommission #5 ...........................................................................
6.5.6 NW 2nd Ave and N Ivy St. UIC Decommission #6 ........................................................
6.5.7 Cinema and NW 1st and Ivy St UIC Decommission #7 ................................................
6.5.8 S Ivy St. CIP #8 .......................................................................................................
6.5.9 N Maple St. at Maple St. Park CIP #9 ......................................................................
6.5.10 N Maple St. and NW 34th Pl CIP #10 ......................................................................
6.5.11 NW 13th Ave from N Ash to N Birch St. CIP #11 ......................................................
6.5.12 NW 9th Ave from N Ash to N Birch St. CIP #12 .......................................................
6.5.13 N Knights Road CIP #13 ........................................................................................
6.5.14 NW 2nd Ave from N Grant St. to NW Baker Dr. CIP #14 ............................................
6.5.15 NW 3rd Ave from N Cedar St. to N Holly St. CIP #15 ................................................
6.5.16 N Holly St. CIP #16 ...............................................................................................
6.5.17 N Juniper and NE 5th Ave #17 ..................................................................................
6.5.18 N Baker St. and N Alder St.#18 ..................................................................................
6.5.19 N Cedar CIP #19 ....................................................................................................
6.5.20 S Pine St. and SE 2nd Ave and SE 3 rd Ave CIP #20 ....................................................
6.5.21 Police Station/NW 3rd Ave Pond CIP #21 ....................................................................
6.5.22 Fish Eddy Wetland Flow Monitoring #22 .....................................................................
6.5.23 Fish Eddy Wetland #23 .............................................................................................
6.5.24 Knight’s Bridge Runoff Treatment #24 ........................................................................

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  6.6 Other Considerations ................................................................................................................ 6-51
    6.6.1 Comprehensive Survey of Existing System ..................................................................
6.6.2 Operation and Maintenance (O&M) Manual ................................................................
6.6.3 System Flow Monitoring ............................................................................................
6.6.4 Coordination with Clackamas County and Oregon Department of Transportation ................
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Section 7: Stormwater Master Plan .................................................................................................. 7-1
  7.1 Introduction .......................................................................................................................
7.2 Capital Improvement Program ...............................................................................................
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Section 8: References ....................................................................................................................... 8-1


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List of Tables
Table 1.1 Capital Improvement Project Summary Sheet .........................................
Table 3.1 Surficial Geologic Units.........................................................................
Table 3.2 Drywells/UICs Observed to Exhibit Failure Characteristics .......................
Table 3.3 Storm System Inventory .......................................................................
Table 3.4: Drywells/UICs to Be Decommissioned ..................................................
Table 3.5: Stormwater Management Structures .....................................................
Table 3.6: Stormwater System Issues and Known Deficiencies ..............................
Table 4.1 City of Canby Population Forecast .........................................................
Table 4.2 UIC Retrofit Alternatives ........................................................................
Table 5.1: Modeled Basins ..................................................................................
Table 7.1 CIP Summary Sheet ..........................................................................
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3-12
3-14
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4-3
5-5
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List of Appendices
A
B
C
D
E
Hydrologic/Hydraulic Modeling Input - Output/Results (Information available on CD)
CIP Cost Estimates
Groundwater Protectiveness Demonstrations and Risk Prioritization for Underground Injection Control (UIC) Devices
Detention Pond Hydrologic/Hydraulic Modeling Input - Output/Results (Information available on CD)
Fish Eddy Wetland Sizing Hydrologic/Hydraulic Modeling Input - Output/Results (Information available on CD)


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List of Acronyms

  %

BMP
cfs
CIP
City
County
Ct
CWS
DMA
Dr
EDL
ENR CCI
Ft 2
GIS
GWPD
HDPE
HGL
Hwy
ID
Kennedy/Jenks
LF
LID
LS
Metro
N
NCCF
NE
NW
O&M
ODOT
ORDEQ
Pl
PVC
Rd
SCS
SDMP
SSA
St
SWMM
SWMP
USGS
UGB
UIC
WPCF
WQF
WQV
Percent
inch
best management practice
cubic feet per second
Capital Improvement Project
City of Canby
Clackamas County
Court
Clean Water Services
Designated Management Agency
Drive
Effluent Discharge Limits
Engineering News Record Construction Cost Index
Square feet
Geographic Information System
Groundwater Protectiveness Demonstration
high-density polyethylene
Hydraulic Grade Line
Highway
identification
Kennedy/Jenks Consultants
Lineal foot
low impact development
Lump sum
The elected regional government for the Portland metropolitan area.
North
non-construction cost factor
Northeast
Northwest
Operation and Maintenance
Oregon Department of Transportation
Oregon Department of Environmental Quality
Place
polyvinyl chloride
road
Soil Conservation Service
Storm Drainage Master Plan
Storm and Sanitary Analysis
Street
Stormwater Management Model (United States Environmental Protection Agency)
Stormwater Master Plan
U.S. Geological Survey
urban growth boundary
underground injection control
Water Pollution Control Facility
water quality flow
water quality volume

 

Last Update: August 22, 2016