The data in Figure 7 also shows that maximum daily demand is approximately double the annual average. This is important for the design of the reticulation as the service level targets must be met during the periods of peak demand. Figure 8 shows the number of days when the demand for water in Blenheim exceeded the annual average by 70% and 90%. In Blenheim over the thirteen year period there was 339 days when demand exceeded 170% average consumption. 45 1100 40 1050 1000 35 950 30 900 25 850 20 800 15 750 10 700 5 650 0 600 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 + 70% + 90% EvapTrans Figure 8 Number of Days of Peak Demand in Blenheim 3.2.3 Water Abstraction Permitted by Resource Consent The service standards that have historically been used in the management of sources for water supply system have been based on the premise that water restrictions should not be imposed in periods of drought less than 1 in 20 years. Whilst a drought of 1 in 50 years should require no more severe restrictions than a hose-pipe ban. These criteria remain important guidelines but are supplemented by the conditions of the resource consent. The Resource Management Act (2002) seeks to protect natural water environment through the control of abstraction from all water sources. The abstraction rates currently imposed on the Council sources are shown in Table 5 Resource Consent Abstraction Conditions Area Consent Site Renewal m³/Day No Date Blenheim U960523 All Blenheim 1/12/2030 38,300 2011-15 abstraction bores. 2016-20 40,200 2021-25 42,000 2026-30 43,500 Picton U041741 Speeds Road 31/5/2020 5,000 U071405 Essons Valley 30/09/2032 34 litres/sec Havelock U080226 Kaituna Well 01/07/2037 2,000 Renwick U031385 Terrace Road Well 2/6/2024 5,000 Page 39 ecnadeecxE syaDnoitaripsnarTopavE