Rangitāiki Water Management Area Plan Change 12 Community Group Workshop 8, 24 Sept 2018
Moemoeā – Vision E ora ana te mauri o te awa Rangitaiki, e manaakitia ana e te iwi, e tiakina ana mō ngā whakatipuranga ō muri mai. Tihei Mauri Ora A healthy Rangitāiki River, valued by the community, protected for future generations. Tihei Mauri Ora. 2
Housekeeping • Fire protocol • Toilets • Meals • Recording and sharing notes • Make yourself at home 3
Purpose of this group To help Council implement the National Policy Statement for Freshwater Management: • confirm values, express preferred objectives • provide feedback on limits for freshwater quality and quantity within this Water Management Area • provide input to solutions for managing activities to meet those limits • advise Council in their decision-making for Plan Change 12 4
Be … . And … . * Respectful of others * Work together * Respectful of cultural diversities * S tay on topic * S * Hear others pecific and frank * Inclusive * Wait our turn * Focused * S ay what we think * Honest * S hare our experience * Timely * Participate fully * Keep a safe environment * Prepared for meetings Ko te wai ko au, ko au ko te wai 5 I am the water and the water is me
Agenda National & Progress Model Regional and next Development updates steps Contact Ecosystem recreation / Sediment Health E. coli Mitigation Phosphorus Nitrogen approach 6
National Update • NPSFM/NES changes early 2019 • land use regulations? intensification, feedlots, fodder crops - • catchments at risk? • Zero Carbon Bill • will agricultural emissions be included? 7
Regional Update RPS Change 3: Rangitāiki River • • Proposed Plan Change 9: Water Quantity • Kaituna - He Taonga Tuku Iho 8
Action in Rangitāiki Catchment 9
Agenda National & Progress Model Regional and next Development updates steps Contact Ecosystem recreation / Sediment Health E. coli Mitigation Phosphorus Nitrogen approach 10
PC12 Timeline Notify Publish Solution Proposed Draft Plan Drafting building Hearings Plan Change Nov 2018 2020 Now-Feb Change Mid - Mid 2019 2019 Late 2019 2019 Discussion document / public communications 11
Calendar Workshop 8: Sept 2018 • Modelling results - baseline and development Workshop 9: Dec 2018 • Groundwater quantity Workshop 9a: Jan/Feb Workshop 10: • Surface water quantity Mar/Apr 2019 • HEP dam lake water quality • Policy Options • Modelling results – mitigation Workshop 11: June2019 • Draft plan change 12 12
National Objectives Framework 13
Purpose today • Gauging your comfort with draft measurable objectives • Present surface water quality information from modelling • Further exploring issues and causes 14
Outcomes sought today For contact recreation, ecological health and other in-river values: • Understand / confirm key water quality issues • Confirm measurable objectives • Understand why we measure E.coli. Nitrogen, Phosphorous and Sediment • Understand and comfortable modelling results • Feedback on approach to exploring mitigations 15
What minimum flows and allocation limits support Surface habitat for key species and water quantity reliable supply? Work in progress Report data Lowland drainage network water quality, springs, tributaries, periphyton 16
After this workshop – what next? • How much do we need to reduce sediment, nitrogen, phosphorous and E.coli by? • Limit setting • What might happen if we manage contaminants better? Will it be enough? • Mitigation package modelling • Costs and benefits, to whom, over what time? • Propose and discuss solutions • Options papers • Wider community engagement • Develop good practice rules and other actions 17
Agenda National & Progress Model Regional and next Development updates steps Contact Ecosystem recreation / Sediment Health E. coli Mitigation Phosphorus Nitrogen approach 18
The SOURCE Model Development climate land use ecological assets dams and weirs irrigation Image from: https://ewater.org.au/products/ewater-source / cities 19
Water quality modelling Rainfall Evaporation Runoff (attenuation) Sediment Phosphorous E.coli Infiltration function Soil sub-drainage function function Nitrogen 20
Model components Constituent Generation Decay Elevation - Slope E.coli - Stocking Units (Domestic and Indigenous) Index - Vegetation Density Catchment Agricultural Production Systems Simulator Renovation Factor Total - Slope Nitrogen Index - Stocking Units (Domestic and Indigenous) - Vegetation Density KLSC - (erodibility, slope, length & gradient, vegetation cover) Total - Dry Weather Concentration Suspended Solids - R Threshold (rainfall) - Hill Slope Delivery Ratio PLSC - (natural total phosphorus, slope, length & gradient, vegetation cover) Total - Total Nitrogen/Total Phosphorus Ratio Phosphorous - Acid Soluble Phosphorus 21
Model Development Scale – sub-catchment Assumptions – parameter values • Measured data • NZ (textbook ) values • Catchment knowledge 22
Calibration Upstream: Rangitaiki at SH5 Downstream: Rangitaiki at Te Teko 23 23
Model summary • All monitoring data has been used • Current land use has been “ground truthed” • Industry consulted during model build • Best practice modelling used • Modellers confident with calibration and performance • Detailed report available soon Current Development D 24
Agenda National & Progress Model Regional and next Development updates steps Contact Ecosystem recreation / Sediment Health E. coli Mitigation Phosphorus Nitrogen approach 25
Contact recreation – what do we want? You and RPS Change 3: Rangitāiki say: Water quality should be safe for swimming where people swim … except after heavy rainfall Ensure that wherever practicable water… is safe for contact recreation (Policy RR 3B(a)) 26
Contact recreation – how safe is it now? Site E. coli Monitored sites map LT Rangitāiki WMA State Trend At monitored sites A Whirinaki A Rangitāiki at Murupara A Matahina Dam A Rangitāiki at Te Teko Naturalised 28
Draft Measurable Objectives E. Coli state bands 1. Maintaining E.coli For at least half of the time, estimated concentrations in risk is <1 in 1000. Predicted average A infection risk is 1% Freshwater Management Units where E. coli For at least half of the time, estimated risk is <1 in 1000. Predicted average B concentrations are A or B infection risk is 2% band For at least half of the time, estimated risk is <1 in 1000. Predicted average C infection risk is 3% 2. Arresting any worsening trends. 20-30%of the time, the estimated risk is >50 in 1000. Predicted average infection D risk is >3% For >30% of the time, estimated risk is ≥ 50 in 1000. Predicted average infection E risk is >7% 29
Model Scenario – naturalised state What contaminants would be generated “naturally”? Description Natural land cover. No productive/developed land use. No water takes or discharges. HEP scheme not operating. Existing major structural modifications remain in place (e.g., dams, channel straightened and cut to sea). 30
Contact recreation – naturalised scenario? A Swimmable B C Not D Swimmable E 31
Model scenario – current state what contaminant loads and yields are generated from the catchment now? Description Current land use, Estimated current takes, Discharges, and Land use practice. 32
Contact recreation - how safe is it now? Modelled A Swimmable B current C state Not D Swimmable E Development D 33
Model scenario – Development C What contaminants would be generated if land use changes? Description • New wetlands in coastal areas replacing mainly dairy farming • New forestry and scrub ( mānuka ) in low capability land in the mid-upper parts of catchments • Pastoral and horticulture development on highest capability land in the Kāingaroa Forest. 34
Contact recreation – what if land use changes? A Modelled Swimmable B Development C C Not D Swimmable E 35
Model scenario – Development D What contaminants would be generated if land use changes? Description • New wetlands in coastal areas, but less than in scenario C • New dairy on land deemed to be suitable • New forestry and scrub in low capability land in the mid-upper parts of catchments • Pastoral and horticulture development of highest capability land in the Kāingaroa Forest. 36
Contact recreation – what if land use changes? Modelled A Development Swimmable B D C Not D Swimmable E Naturalised 37
Swimming summary You and RPS Change 3: Rangitāiki say: Water quality should be safe for swimming where people swim … except after heavy rainfall Ensure that wherever practicable water… is safe for contact recreation (Policy RR 3B(a)) • Safe for swimming at monitored sites • Modelling indicates catchments are safe for swimming now and if land use changes as estimated • We need to ensure E. coli concentrations don’t increase beyond their current band 38
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