Topic 1 --SP 1B - Cost of Water Conservation The figure below was taken from a publication by USC Center for Sustainable Cities, http://sustainablecities.usc.edu/research/publications.html, entitled "Water Conservation Cost Effectiveness* specifically dealing

with the Los Angeles Department of Water and Power. The y-axis is the cost of the conservation measure in $/acre-ft water saved if you Implemented the water conservation measure. For example, if you bought a high efficiency clothes washer, the cost of the water you saved would be $800/acre-ft. (This is calculated based on the cost of the machine divided by the amount of water saved over the life of the washing machine taking into account the time value of money discussed in your Engineering Economics class you are now taking.) a) For residential water conservation, what measures would you focus on to get the biggest "bang" for your dollar, L.e., what would get you the most water saved for the least amount of money spent? Rank the 4 Conservation Measures from 1 to 4 with 1 being the least cost for the amount of water saved and 4 the most expensive measure for the amount of water saved. Remember the chart reads "$/acre-ft of water saved". b) Many people have said "water conservation is free". When is it free and give an example. Figure 7.11 Residential Water Conservation Measure's Average Costs Residential Water Conservation Measures Cast par Acre Foot $800 5700 $600 $500 5400 $300 $200 5:00 50 High Effeciency Toilets High Effeciency Clothes Washers Rotating Nozzles for Pop-up Spray Heads Weather use Irrigation Controllers