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I I I I '. PAGE I. Introduction and Summary Backg round Boulder Creek Master Plan Development Plan I I Excavated Floodway Approach Between 6 and 17th Reach Canyon Mouth to 6th Street Reach 26th Street to 9th Street Reach 39th Street to Broadway Reach 4 Broadway to Arapahoe Reach 5 Arapahoe Avenue to 17th Street Modified Plan II I Approach Downstream of 17th Selected Bridge Improvements and Related Channel Improvements Flood-Proofing and Relocation Early Warning Evacuation Statement on Sediments and Debris Water Quality Stream Characteristics 2 4 4 5 5 6 7 7 Flora Fauna Animals Birds Fish "I I :. I . I Rare and Endangered Species Statement on Recent Developments not Included in Phase B Study Data 7 8 9 9 10 10 10 10 10 11 11 I I I. Hydrological Summary IV. Flood Plain Evaluation Past Floods History of Proposed Flood Control Evaluations General Approach Flood Plain and Floodway Data Flood Plain Management Actions by the City of Boulder Summary Statement on Water Quality Flood Insurance Flood Plain Regulations Flood Hazard Notification Benefit/Cost Summary for Proposed Master Plan Project Recommendation Acknowledgements I I . '. I '. \1 'I V. Design Criteria I I. Basin Description and Data Basin Description 13 13 14 14 15 VI. Master Plan Improvements Study Area Climate Geology VI I. Benefit/Cost Analysis Analysis Procedures PAGE 15 16 17 18 18 18 18 19 19 19 22 25 25 28 33 33 34 34 36 37 43 59 59 I