0.5 Pauatahanui Stream Daily Flow MALF 0.45 90% MALF 0.4 0.35 - PowerPoint PPT Presentation

0.5 Pauatahanui Stream Daily Flow MALF 0.45 90% MALF 0.4 0.35 Stream Flow (m 3 /s) 0.3 0.25 0.2 0.15 0.1 0.05 0 1 Jan 1981 1 Feb 1981 1 Mar 1981 1 Apr 1981 1 May 1981 1 Jun 1981 Time

Water allocation Te Awarua-o-Porirua whaitua

• Make sure there’s enough flow in the stream • Abundant tuna and fish that are • Make sure there aren’t too many safe to catch and eat contaminants in the stream • Good flows at low tide • Make sure there’s good riparian shading • The use of water and waterways and fish passage provides for economic • • Make sure people can access water How do we share out the access to the opportunities and benefits. water and discharges within the limit? when they need it

Water allocation recap • Some terms • MALF – Mean annual low flow • Minimum flow • Allocation limit • Consented, permitted and stock drinking & domestic use takes

Water allocation recap 0.5 0.5 Pauatahanui Stream Daily Flow Pauatahanui Stream Daily Flow Minimum Flow = 90% MALF Minimum Flow = 90% MALF 0.45 0.45 Residual Stream Flow After 30% MALF Allocation Residual Stream Flow After 30% MALF Allocation 0.4 0.4 0.35 0.35 Stream Flow (m 3 /s) Stream Flow (m 3 /s) 0.3 0.3 0.25 0.25 0.2 0.2 0.15 0.15 0.1 0.1 0.05 0.05 0 0 1 Jan 2014 1 Jan 1981 1 Feb 2014 1 Feb 1981 1 Mar 2014 1 Mar 1981 1 Apr 2014 1 Apr 1981 1 May 1981 1 May 2014 1 Jun 1981 1 Jun 2014 Time Time

The “90/30” limits Good habitat protection for native freshwater fish species in the Whaitua Moderate reliability for users of water Need value judgement decision on the balance – you asked for some alternatives to help explore the balance

Alternative limits Alternative minimum flow and allocation amounts compared to 90+30 Value Attribute Effect 100+20 90+20 100+25 90+25 100+30 90+30 100+40 90+40 Intensity of ‘human Better Same Better Same Better Better Same Ecosystem induced’ stress Good health and Habitat protection protection Additional days of stress at Slightly mahinga kai Better Better Better Same Worse Worse or below minimum flow better Time with full access to Slightly Slightly Same Better Worse Worse Worse allocation amount worse better Moderate Supply reliability reliability Economic use Time on total restrictions Worse Same Worse Same Worse Worse Same of water Availability of Amount of water that can Less water for be taken from a stream More economic use • Recognise there is a trade-off between these • Higher minimum flows & smaller allocation limits are slightly more precautionary with better habitat protection, less water available and similar or better reliability for those with it • Need value judgement decision on the balance

THE WATER ALLOCATION BUCKET ALLOCATION LIMIT CONSENTED WATER TAKES OTHER PERMITTED ACTIVITY WATER USE STOCK DRINKING WATER & DOMESTIC USE

Alternative limits Consented Existing allocation Stock & MALF domestic 20 25 30 40 TG Other With TG Without TG Pauatahanui Stream 96 19 24 29 38 14 13 4 31 17 Horokiri Stream 89 18 22 27 36 21 2 2 25 4 Porirua Stream 151 30 38 45 60 0 0 2 2 2 Duck Creek 15 3 4 5 6 4 0 1 5 1