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Last modified
10/26/2010 9:24:17 AM
Creation date
1/10/2008 11:21:05 AM
Metadata
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Template:
SWSI
Basin
Statewide
Title
SWSI Phase 1 Report - Section 8 Options for Meeting Future Water Needs
Date
11/15/2004
Author
CWCB
SWSI - Doc Type
Final Report
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Section 8 <br />Options for Meeting Future Water Needs <br />2 <br />1.8 <br />1.6 <br />1.4 <br />LL <br />~ 1.2 <br />°' 1 <br />~ <br />0 0.8 <br />~ <br />0.6 <br />0.4 <br />0.2 <br />0 <br />Percent of Reusable Return Flow that is Exchanged <br />Tmtal Yield from Exchange of 1 AF of Co <br />Potential issues and conflicts involving reuse by <br />exchange include: <br />^ There must be adequate exchange potential (physical <br />supply) available at the upstream point of diversion. <br />^ The substitute supply (the reusable water that is used <br />to replace the water diverted by exchange) must be <br />suitable for downstream water uses as required by <br />statute. <br />^ There may be water quality objections from <br />downstream users. The substitute supply may be of a <br />different water quality from what the downstream user <br />would have received absent the exchange. A water <br />court procedure allows these issues to be addressed. <br />^ Storage may be needed to regulate year round <br />effluent return flows. The timing of return flows may <br />not match the times when there is exchange potential. <br />For example, winter effluent may need to be stored <br />for exchange to agricultural users during the irrigation <br />season. <br />^ Previously unused reusable effluent historically <br />resulted in reduced or morejunior river calls <br />controlling the river. <br />^ As water availability decreases, M&I users are looking <br />to develop or expand the reuse of existing reusable <br />return flows via water rights exchanges. To the extent <br />these reusable flows have been returning to the <br />rivers, they have been used by downstream water <br />users. <br />Figure 8-5 <br />nsumable Water Based on Reuse to Extinction <br />^ As reusable supplies that have been historically used <br />by downstream users are reused, river calls may <br />become more senior, impacting all users. <br />8.2.5.2 Non-potable Reuse <br />Non-potable reuse involves the capture and use of <br />legally reusable return flows for the irrigation of urban <br />landscapes or for industrial uses such as cooling or <br />process water. Since return flows from landscape <br />irrigation are hard to capture in one location, non-potable <br />reuse to date has involved the reuse of consumable <br />effluent discharged from wastewater treatment facilities. <br />The effluent undergoes additional treatment to meet non- <br />potable reuse standards. This treatment usually involves <br />filtration and additional disinfection. <br />As noted, it is infeasible to capture return flows from <br />landscape irrigation, though additional yield could be <br />achieved if the landscape irrigation return flow points and <br />amounts are identified and exchanged to upstream <br />points. A schematic illustrating non-potable reuse for <br />landscape irrigation is shown in Figure 8-6. <br />Figure 8-7 shows how the total yield from 1 AF of <br />consumable water based on the percent of the effluent <br />return flows that are used for landscape irrigation can be <br />increased. For example, if 50 percent of the effluent <br />return flows from an M&I use of consumable water were <br />reused for landscape irrigation the total yield realized <br />from 1 AF of consumable water is 1.25 AF. <br />~~ <br />~~ <br />Sfvtewide Woter Supoly Initiofive <br />8-16 S:\REPORT\WORD PROCESSING\REPORT\S8 11-9-04.DOC <br />0% 20% 40% 60% 80% 100% <br />
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