Town of Friday Harbor
San Juan Island
 

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Shoreline

60 Second Street
PO Box 219
98250

 

 

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Table of Contents

Appendices   Figures   Tables

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Executive Summary

Chapter 1 Introduction

Chapter 2 Drainage Area Characteristics

2.1

Introduction

2-1

2.2

Location

2-1

2.3

Drainage Basins

2-1

2.4

Waterways and Waterbodies

2-3

2.5

Water Quality

2-3

2.6

Topography

2-4

2.7

Geology

2-4

2.8

Soils

2-4

2.9

Climate

2-5

2.10

Critical Areas

2-6

2.10.1

Aquifer Recharge Areas

2-7

2.10.2

Critical Habitat/Eel Grass Areas

2-7

2.10.3

Geologically Hazardous Areas

2-7

2.10.4

Flood Hazard Areas

2-8

2.10.5

Wetlands

2-8

2.11

Population Trends

2-8

2.12

Land Use and Zoning

2-9

2.13

Utility Services

2-9

2.14

Stormwater Utilities

2-10

2.15

Existing Stormwater Conveyance System

2-10

2.16

Point and Nonpoint Source of Pollution

2-11

2.17

Design Criteria

2-11

Chapter 3 Stormwater Regulations

3.1 Introduction 3-1
3.2 Federal Regulations 3-1
3.2.1 Phase I NPDES Stormwater Permits 3-2
3.2.2 Phase II NPDES Stormwater Permits 3-2
3.2.3 Endangered Species Act 3-3
3.3 State Regulations 3-6
3.3.1 Phase I NPDES and State Waste Discharge Stormwater Permits for Municipalities 3-6
3.3.2 Phase II NPDES and State Waste Discharge Stormwater Permits for Municipalities 3-7
3.3.3 The Puget Sound Water Quality Management Plan 3-7
  Local Government Planning and Stormwater Programs (SW-1) 3-7
  Stormwater Technical Manual (SW-2.1) 3-8
3.4 County Regulations 3-9
3.5 Town Regulations 3-9
3.6 Washington State Department of Transportation Regulations 3-10
3.7 Jurisdictional Coordination 3-10

Chapter 4 Existing Stormwater Drainage System

4.1 Introduction 4-1
4.2 Drainage System Inventory for Model 4-2
4.2.1 Drainage Basin No. 1 4-2
4.2.2 Drainage Basin No. 2 4-3
4.2.3 Drainage Basin No. 3 4-3
4.2.4 Drainage Basin No. 4 4-4
4.2.5 Drainage Basin No. 5 4-5
4.2.6 Drainage Basin No. 6 4-5
4.2.7 Drainage Basin No. 7 4-6
4.3 Hydrologic/Hydraulic Modeling 4-6
4.3.1 Design Storm 4-7
4.3.2 Runoff Parameters 4-8
4.3.2.1 Drainage Basin Area 4-8
4.3.2.2 CN Values 4-8
4.3.2.3 TC Values 4-9
4.3.3 Computer Applications/Hydra Model 4-10
4.3.4 Model Calibration/Verification 4-19
4.4 Model Results 4-19
4.4.1 Drainage Basin No. 1 Model Results 4-20
4.4.2 Drainage Basin No. 2 Model Results 4-20
4.4.3 Drainage Basin No. 3 Model Results 4-21
4.4.4 Drainage Basin No. 4 Model Results 4-22
4.4.5 Drainage Basin No. 5 Model Results 4-23
4.4.6 Drainage Basin No. 6 Model Results 4-24
4.4.7 Drainage Basin No. 7 Model Results 4-24
4.5 Town Identified Stormwater Problem Areas 4-25
4.6 Previous Hydraulic Studies 4-26

Chapter 5 Nonpoint Source Pollution Analysis

5.1 Introduction 5-1
5.2 Impacts to Water Quality 5-1
5.3 Water Quality Standards 5-3
5.3.1 Parameters of Concern 5-4
5.3.2 Water Quality Criteria 5-7
5.4 Existing Background Water Quality Surveys 5-9
5.5 Sources of Nonpoint Pollutants 5-9
5.5.1 Urban Development 5-10
5.5.2 County and State Highways 5-11
5.6 General Considerations in Urban Stormwater Quantity and Quality Control 5-12
5.6.1 Stormwater Quality versus Quantity Control 5-13
5.6.2 Construction Phase versus Long-Term Site Operation Phase 5-13
5.6.3 Structural versus Nonstructural Controls 5-13
5.6.4 Source Control versus Downstream Treatment 5-14
5.6.5 Control in New versus Existing Developments 5-14
5.6.6 Control of Acute versus Chronic Impacts 5-14
5.6.7 Special Sensitive Area Considerations 5-14
5.7 Stormwater Management Alternatives 5-14
5.7.1 Structural Alternatives 5-15
5.7.1.1 Storage and Regulated Release 5-15
5.7.1.2 Minimize Directly Connected Impervious Area 5-16
5.7.1.3 Swales and Filter Strips 5-17
5.7.1.4 Parking Blocks 5-18
5.7.1.5 Infiltration Devices 5-18
5.7.1.6 Summary 5-20
5.7.2 Non-Structural Alternatives 5-21
5.7.2.1 Facilities Maintenance 5-21
5.7.2.2 Changes to Municipal Codes and Regulations 5-23
5.7.2.3 Enforcement 5-24
5.7.2.4 Public Involvement and Education 5-24
5.7.2.5 Best Management Practices 5-26

Chapter 6 Capital Improvement Plan

6.1 Introduction 6-1
6.2 Capital Improvement Projects 6-1
6.2.1 Introduction 6-1
6.2.2 Drainage Basins No. 1 and 2 6-2
6.2.3 Drainage Basin No. 3 6-3
6.2.4 Drainage Basin No. 4 6-3
6.2.5 Drainage Basin No. 5 6-5
6.2.6 Drainage Basin No. 6 6-5
6.2.7 Drainage Basin No. 7 6-5
6.2.8 CIP Recommended Projects 6-7
6.3 Facility Maintenance 6-9
6.3.1 Maintenance Program 6-9
6.3.2 Private Drainage Facilities 6-11
6.3.3 Preferred management Strategy 6-11
6.3.4 Management of Maintenance Residuals 6-12
6.3.4.1 Street Waste Liquid 6-12
6.3.5 Maintenance of Natural Systems 6-13
6.4 Best management Practices 6-13
6.4.1 Introduction 6-13
6.4.2 Runoff Treatment 6-15
6.4.3 Streambank Erosion Control BMPs 6-15
6.4.4 Source Control BMPs 6-16

Chapter 7 Implementation

7.1

Introduction 7-1
7.2 Service Charges and Connection Charges 7-1
7.3 Grant and Loan Funds 7-2
7.3.1 Public Works Trust Fund 7-2
7.3.2 Department of Ecology Water Quality Program 7-2
7.3.3 Flood Control Assistance Account Program 7-3
7.3.4 Aquatic Lands Enhancement Account 7-3
7.4 Debt Financing 7-3
7.5 Developer Fees 7-4
7.6 Improvement Districts and Special Assessments 7-4
7.7 Recommended Financing Methods 7-5
7.8 Preliminary Rate Analysis 7-7

01/20/2017

 

Neither the Town of Friday Harbor nor any agency, officer, or employee of the Town warrants the accuracy, reliability or timeliness of any information presented here, and shall not be held liable for any losses caused by such reliance on the accuracy, reliability or timeliness of such information.
Portions of such information may be incorrect or not current. Any person or entity who relies on any information obtained from the system, does so at his or her own risk.

Copyright 2017 Town of Friday Harbor Washington.  All rights reserved.