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Contents <br />Acronyms and Abbreviations iii <br />1.0 Introduction 1 -1 <br />1.1 Background 1 -1 <br />1.2 Plan Objective 1 -1 <br />1.3 Report Organization 1 -1 <br />2.0 Drainage Basin and Watershed Characteristics 2 -1 <br />2.1 General Description 2 -1 <br />2.2 Drainage Basins 2 -1 <br />2.3 Population, Existing Land Use and Future Development 2 -4 <br />2.4 Drainage System Characterization 2 -7 <br />2.5 Water Quality Characterization 2 -10 <br />2.6 Aquatic Habitat Characterization 2 -12 <br />2.6.1 Green /Duwamish River 2 -12 <br />2.6.2 Gilliam Creek 2 -12 <br />2.6.3 Riverton Creek 2 -13 <br />2.6.4 Southgate Creek 2 -13 <br />2.6.5 Johnson Creek 2 -14 <br />2.6.6 Mill Creek 2 -14 <br />3.0 Regulations and City Policies 3 -1 <br />3.1 Applicable Surface Water Regulations 3 -1 <br />3.2 Potential Regulatory Changes 3 -1 <br />4.0 Surface Water Issues and Solutions 4 -1 <br />4.1 Available Data and Information 4 -1 <br />4.2 Identified Surface Water Issues 4 -1 <br />4.3 Menu of Solutions to Address Surface Water Issues 4 -4 <br />4.3.1 Programmatic Solutions 4 -4 <br />4.3.1.1 Education 4 -5 <br />4.3.1.2 Incentives 4 -6 <br />4.3.1.3 Regulatory and Policy Changes 4 -6 <br />4.3.1.4 Inspection and Enforcement 4 -6 <br />4.3.1.5 Illicit Discharge Detection and Elimination 4 -7 <br />4.3.1.6 Public Involvement 4 -7 <br />4.3.1.7 Surface Water System Maintenance 4 -7 <br />4.3.2 Capital Project Solutions 4 -8 <br />4.3.2.1 Drainage 4 -9 <br />4.3.2.2 Water Quality 4 -10 <br />4.3.2.3 Aquatic Habitat 4 -11 <br />4.4 Solutions to Tukwila's Surface Water Issues 4 -11 <br />5.0 Capital Improvement Projects 5 -1 <br />WBG031611103411 SEA\TU KW I LASURFACEWATERCOMPPLAN _FINAL_V2. DOCX <br />