Water and Development: A New Western Paradigm presented as Holistic Approach to Sustainable Water Management Northwest Douglas County

Transcription

1 nd Development: A New Western Par presented as listic Approach to Sustainable Water Manageme in Northwest Douglas County March 2007

2 Introduction nters Conklin, Littleton City Council - Mode Roush, P.E., President, Leonard Ric ineers, Inc. Noble, Esq., Ryley, Carlock & Applew stopher S. Douglass, P.E., Meurer & A

3 t Statewide Drought sing Front Range Municipal Demand as County Regulations ic Approach Required- Cut Demands 50%

4 DEMA Outd Irriga Y tion

5 Applicants Advisory Committee Peer Review Committee Study Team

6 cants minion Water and Sanitation District stle Pines North Metropolitan District uglas County ing lorado Water Conservation Board minion Water and Sanitation District uglas County stle Pines North m Valley Heights HOA nderbird Water & Sanitation District

7 airs da Sandquist Lead Chair, attorney Conklin Littleton City Council, hydrology background ittee Participants rew Appell Denver Water Planning Division Porter Design Workshop, land planner Gilsdorf Arapahoe Acres Nursery, Chatfield East HOA le Adams Thunderbird Water & San Dist Watson Douglas County e Salazar Douglas County t Mecham No. Colo. Water Conservancy Dist. e Merritt Colo. River Water Conservation Dist. l Lander City of Boulder CWWC

8 do Water Conservation Board a McCaig, Rod Kuharich Engineers Office Byers, Dick Wolfe do Department of Public Health and Environment/ quality ley Carr

9 Water Law Requirements (Augmentation) Precipitation Components Under Native Conditions Outdoor Water Demand Management Irrigation Demand

10 Water Law Requirements (Augmentation) Precipitation Components Under Native Conditions Outdoor Water Demand Management Irrigation Demand

11 f a Scarce Resource mponent of Total agement g States Allow rage It

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13 nnual Total Precipitation for Kassler, Co ( x = in g = in = in

14 Water Law Requirements (Augmentation) Precipitation Components Under Native Conditions Outdoor Water Demand Management Irrigation Demand

15 nt Law: % of precipitation diverted and consumed must be augme Exceptions: Gravel pits (CRS ) Streambed reservoirs (CRS (5)) ere 30% or less of precipitation falling on lake surface mu ugmented)

16 Runoff + Deep Percolation + Native Vegetation ET (consumptive use) = Surface Water Return Flow to River + Ground Water Return Flow to River = Current Law Augment Protect Existing Wate Rights

17 (Based on 1,500 Sq Ft Roof Area) Current Law Augmentation Requirement Actual Pre-Development Runoff

18 Water Law Requirements (Augmentation) Precipitation Components Under Native Conditions Outdoor Water Demand Management Irrigation Demand

19 n = ion ET tion n Moisture

20 r Runoff (0% to 12%) + Deep Percolation (0% to 3%) + Native Vegetation ET (consumptive use) (85% to 100%) = Current Law Augmentation Requirement Surface Water Return Flow to River (0% to 12%) + Ground Water Return Flow to River (0% to 3%) = Protect Existing Water Righ Augmentation Requiremen

21 Water Law Requirements (Augmentation) Precipitation Components Under Native Conditions Outdoor Water Demand Management Irrigation Demand

22 Influencing Demand ted Area caping m Performance r Management

23 lopment Criteria and Density rvious Area ted Turf Area ted Planting Area rrigated Area

24 ategories egrass scue ffalograss ings ditional derate tive

25 cation Method Irrigation System ray tor bsurface Drip Efficiency 75% 80% 95% llation & Operations Method cellent ood Description Efficiency 100% 80%

26 tive Precipitation tion System Technology Technology Type tive ssive Technology Technology Adjustment Factor 80% 40% 0%

27 ng these factors a formula was developed to establ or water demands: ater d = (Landscaping - Water Management) System Performance X Ir

28 Traditional Landscaping Moderate Conservation Landscaping Water Wise Landscaping

29 d Area Traditional Landscaping Total Irrigation Area = 50.2% of Lot 70 Area (Square Feet) 3,470 2,000 1, ,970 HOUSE STREET 100 Annual Demand Acre-Feet Domestic = 0.30

30 d Area Moderate Conservation Landscaping Total Irrigation Area = 38.5% of Lot 70 Area (Square Feet) 3,470 1,500 1,000 1,000 6,970 HOUSE STREET 100 Annual Demand Acre-Feet Domestic = 0.30

31 d Area Water Wise Landscaping Total Irrigation Area = 21.5% of Lot 70 Area (Square Feet) 3,470 1, ,000 6,970 HOUSE STREET 100 Annual Demand Acre-Feet Domestic = 0.30

32 Alternative Water Demand Summary One Single Family Residential Equivalent (SFE) emand Scenario l Landscaping Irrigation Demand (acrefeet) 0.35 (gallons per square foot) 32.3 Saving Tradi (% - Conservation Landscaping e Landscaping

33 Irrigated Area 57% water savings Landscaping 34% water savings System Performance 52% water savings Water Management 34% water savings

34 Water Law Requirements (Augmentation) Precipitation Components Under Native Conditions Outdoor Water Demand Management Irrigation Demand

35 der Commitment rmation and Education sources Acceptance lling to implement water savings quires a paradigm shift in landscape thinking

36 Water Law Requirements (Augmentation) Precipitation Components Under Native Conditions Outdoor Water Demand Management Irrigation Demand

37 Rooftop Capture Efficiency 15% 85% Cistern Capacity Losses Precipitation Rooftop Capture Efficiency 15% 85% Regional Catchment Losses

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39 Rancho Viejo Santa Fe, NM

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41 eral n of tation ure Supplementa irrigation water w demand > supp Gener precipit when de

42 Precipitation Collection Average of Study Period sf of Roof Capture Area

43 scale: allon capacity ~ $5.50 to $6.50 per gallon allon capacity ~ $2.00 to $2.40 per gallon orage (10,000+ gallon)~ $1.00 to $1.75 per gallon Cost/benefit analysis in this study: Depends on individu situation in terms of a supplies (e.g. wells g

44 e Single Family Residential Equivalent (SFE) nario Irrigation Demand Cistern Supply Supplemental Irrigation Supply Fro Precipitati Supply (Acre- Feet) (Acre- Feet) (Acre-Feet) (%) caping % caping & % ation % ation & % %

45 ment Codes Government codes implemente centive for water conservation on holistic basis as d conservation actions. rojects Pilot projects to provide real data to sup findings, outdoor water conservation savings, and ce. tive Action Legislative action to facilitate rain nd attract capital for pilot projects while providing b o guard against abuse.