Targets
Stage 1 of NVIRP will implement water distribution and delivery efficiency improvements by 2012-13 and is projected to deliver an estimated 225 GL (long-term annual average) of water savings by 2013-14. Water savings will be generated progressively over the term of the project as a result of the works implemented by NVIRP.
Stage 2 of the project is intended to achieve an additional estimated 200 GL (long-term annual average) of water savings.
Measurements
The DSE's Technical Manual for the Quantification of Water Savings (available at http://www.ourwater.vic.gov.au/, file size 1.84 MB) provides the framework for measuring and auditing water savings from irrigation modernisation projects across Victoria including NVIRP.
In accordance with this technical manual, the water saved by NVIRP project is calculated relative to the water lost in the nominal year, and converted into long-term average water (Long Term Cap Equivalent - LTCE) saved for the purpose of reporting.
Independent Audits
Water savings derived from the project are independently audited on an annual basis by the Department of Sustainability and Environment's independent external auditor, Cardno (Qld) Pty Ltd in accordance with the DSE technical manual.
Three audits have been undertaken to date. The 2008-09 audit confirmed water savings of 28 GL/ yr (Long-term cap equivalent) and the 2009-10 audit confirmed water savings of 56 GL/ yr (Long-term cap equivalent). Both figures were greater than NVIRP's Stage 1 Business Case targets.
The 2010-2011 water savings audit has been undertaken as per the protocols in DSE's Technical Manual. The audit found that water savings estimation was in accordance with the Water Savings Protocol and of acceptable accuracy. Please refer to the DSE website for more information. Please click here for NVIRP's summary of audit findings.
Audited water savings are reported in NVIRP's annual reports. Please click here to view these reports.
Reducing Losses
Water losses need to be measured accurately to guide investment decisions. NVIRP is replacing and removing old service points to reduce measurement error and leakage around service points. In addition, automatic regular gates are being installed to control outfall losses and improve water level regulation which in turn improves service levels to irrigators.
