Adapting the High Line Canal for Stormwater Management
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About the Presenter: Harriet LaMair is a founding member of the High Line Canal Conservancy. She is a former Founder and Executive Director of the Cherry Hills Land Preserve, as well as a Former Councilwoman for Cherry Hills Village. She has a tenure rich in government and public policy experience as well as an unsurpassed passion for building connections between communities and the natural world.
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Adapting the High Line Canal for Stormwater Management
- 1. ADAPTING AND PROTECTING THE THE CANAL THROUGH STORMWATER ???
- 2. PRESERVE, PROTECT AND ENHANCE THE 71 MILE LONG CANAL IN PARTNERSHIP WITH THE PUBLIC
- 3. HAND DUG IN 1883 ACQUIRED BY DENVER WATER IN 1920 OPENED TO RECREATION IN 1970
- 4. 71 MILES OVER 800 ACRES CONNECTS 8,000 ACRES
- 5. 11 JURISDICTIONS 24 SCHOOLS 350,000 RESIDENTS
- 6. OUTLIVING ITS HISTORIC USE 60-80% OF WATER LOST
- 7. THE PLAN FOR THE HIGH LINE CANAL
- 8. A THRIVING NATURAL COORIDOR Strategies to improve ecological and environmental health
- 9. Stormwater Management in the Canal - Benefits • Vibrant Canopy – Canal bottom would be wetter 100 more days per year • Environmental Health Improves water quality Stormwater 72-hour hold provides 40% cleaner water Improves air quality Improves Wildlife and environmental habitat Improves community health and livability • Reduces Gray Infrastructure Costs $39 Million in Potential Savings
- 10. High Line Canal Stormwater Plan Update Shea Thomas, UDFCD Watershed Services Manager Alan Leak, RESPEC Program Manager May 18, 2018
- 11. HighLineCanalWorking 2018 High Line Canal Stormwater and Operations Master Plan
- 12. 12 Municipality 2-Year Spills5-Year Spills 10-Year Spills 25-Year Spills 50-Year Spills 100-Year Spills Douglas County 0 0 0 10 15 16 Littleton 0 0 0 0 0 0 Centennial 0 0 0 0 0 4 Greenwood Village 0 0 1 2 4 5 Cherry Hills Village 0 0 0 6 8 9 Denver 0 0 0 2 4 7 Arapahoe County 0 0 0 1 1 1 Aurora 0 0 0 1 2 5 Total 0 0 1 22 34 47 Flood Modeling Results Existing Spills – Wastegates open, no water quality berms Canal HighLineCanalWorking
- 15. 5 • Reduce Flooding - Flood flows up to the 100-year event can be managed with the recommended plan of stormwater improvements • Improve Water Quality - Water quality improvements in the Canal can be accommodated as is or with additional stormwater controls • Management of Existing SW Needed to Avoid Flooding • Additional Stormwater Can Be Managed in the Canal - certain reaches of the Canal can handle more with jurisdictional modeling and infrastructure improvements Significant Stormwater Already in the Canal CONCLUSIONS
- 16. ADAPT THE CANAL FOR STORMWATER WATER LAW AND REGULATIONS
- 17. Existing Condition After storm event with stormwater Example Water Quality Berms
- 18. PILOT PROJECTS UNDERWAY • EISENHOWER • GREENWOOD VILLAGE • SHEA HOMES, CHATFIELD
- 20. One Water – Smart Water
- 21. WHAT IS STORMWATER? • STORMWATER IS RAINFALL, SNOWMELT OR EVEN WATER FROM A GARDEN HOSE. • STORMWATER RUNOFF IS THE PORTION OF STORMWATER THAT RUNS OFF A SURFACE SUCH A DRIVEWAYS, PARKING LOTS AND OTHER ADJACENT LANDS • UNMANAGED STORMWATER RUNS DIRECTLY INTO MANY OF OUR RIVERS AND STREAMS AND EVEN INTO THE HIGH LINE CANAL, WITHOUT ANY TREATMENT