Durango WCPlan 1998 - Laserfiche WebLink

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1. Inverted Rate Structure $20,000 $0 $2,400 470 af $5 1.1 mgd $2,200 2. Public Education/Admin. $0 $30,000 $30,000 333 af $90 1.2 mgd$25,000 3. Retrofit Program $75,000 $0 $8,900 131 af $68 0.1 mgd$89,000 The results showed that the inverted rate structure and public education program are both economical feasible measures. The inverted rate structure has been implemented with no cost, but no measurable savings. The public education program was estimated to cost approximately $25,000 per mgd of reduction in peak day demands. The retrofit program does not appear to be economically feasible at this time as the program would cost over $89,000 per mgd of reduction in peak day demands. It could however be re-evaluated in the future as a potential water saving measure. Therefore, it is recommended that the City adopt the public education program outlined above. The public education program would cost approximately $10,000 on an annual basis for the cost of supporting materials such as mailers or billing inserts. The combined water savings from the inverted rate structure and the education program would be 803 acre-feet per year and would reduce peak day demands 2.3 mgd. This computes to a reduction of approximately 12% in annual demands and 14.5% in peak day demands. For purposes of this study, it was assumed that one-half of the estimated savings described above would actually be realized. Therefore, annual water savings would be approximately 6% or 402 acre-feet, peak day demands would be reduced approximately 7.6% or 1.2 mgd and peak month treated demands would be reduced to 809 acre-feet per month during an average year. The annualized cost per acre-foot of water saved would be approximately $67 and the costs per mgd to reduce peak day demands would be approximately $23,500. The total water savings for the other populations in the study period were also calculated. The results are shown in the table below. For purposes of the Gronning study, it was assumed that the water savings will affect reservoir sizing. Projected Water Demands with Water Conservation Program Estimated Population 18,000 25,000 30,000 (Current) 188 gpcd 3,791 af 242 af 8.7 mgd 0.7 mgd 40,000 Per Capita Use Annual Treated Water Demand Projected Annual Water Savings Peak Day Treated Demand Reduction - Peak Day Demand 188 gpcd 5,264 af 336 af 12.0 mgd 1.0 mgd 188 gpcd 6,318 af 402 af 14.5 mgd 1.2 mgd 188 gpcd 8,423 af 538 af 19.3 mgd 1.6 mgd A surface water diversion from the Animas River has been completed to irrigate some of the City parks. Implementation of the water conservation plan recommendations and the system for non-potable water for irrigation will reduce its current peak day demand by approximately 1.2 million gallons per day thereby increasing the capacity of the water delivery system to serve 20,000 people. This will allow the City an opportunity for the finalization of the AnimasILa Plata Project or investigation of dry year leases or construction of the Horse Gulch Reservoir Alternative. X. Program Implementation In order to meet the requirements of HB91-1154, the City will be required to take several steps in the implementation process. 1. A public participation process will be required before the plan can be completed. After this plan is made available to the public, comments must be solicited by the City for a period of 60 days. After all comments have been reviewed, the plan will be revised, adopted by City Council, and submitted to the CWCB. 2. The City must development an implementation plan and budget for the water conservation program. 3. Each year the water saving measures that were used during the previous year, the amount of water saved, costs and benetits, problems encountered, and plans for the future year should be analyzed and reported to the policy makers and the public. 14