water allocation and governanance for resilient catchments · 1. how do land uses affect the water...
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Theme#2
Water Allocation & Governance for Resilient Catchments
Andrew Fenemor Landcare Research, NelsonTim Davie LCR, now ECanJoseph Thomas TDCJagath Ekanayake Landcare Research, LincolnTimothy Hong, Chris Daughney GNSMike Stewart, Paul White GNSRoger Young, Dean Olsen , Jim Sinner CawthronDiarmuid Neilan, Kiran Kumar Students
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Motueka catchment
water issues
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Water Allocation & GovernanceResearch Questions
1. How do land uses affect the water yields over the catchment?
2. What is the most defensible way to allocate water resources over the catchment?
3. How can water quality, aquatic habitat and isotope data inform water allocation?
4. How do economic returns affect irrigators’ uses of water?
5. What governance and policy approaches would improve effectiveness of water management plans and planning processes?
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Groundwater Allocation issues
• How do land uses affect the water yields over the catchment?
• What is the most defensible way to allocate water resources over the catchment?
• Catchment scale hydrological modelling
• Hillslope recharge to aquifers & wetland water balance
• River-aquifer modelling for setting water allocation limits
Major areas of investigation
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Catchment Hydrological Modelling
Current Pre-human Maximum Pines
SWAT catchment water balance model shows river flow at Woodstock is about 21% higher now than under prehistoric bush land cover, and with maximum possible afforestation would be about 16% higher.
-14
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-2
0Baton
UpperMotueka at
GorgeStanleyBrook Tadmor Wangapeka Motupiko Woodstock
Chan
ges
(%)
Prehistoric Potential pine
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Catchment Modelling
SWAT also simulates N and P losses from catchment to coast with changing land use
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1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002
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Measured Swat
WATYIELD water balance model estimates annual water yields and 7-day minimum flows for catchments with changed land cover (eg planting or harvesting forests)
Improved WATYIELD model available for downloadhttp://icm.landcareresearch.co.nz/
Fahey et al 2010: Using the WATYIELD water balance model to predict catchment water yields and low flows. J Hydrol. NZ submitted
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Area-specific Hillslope Recharge Model
• Needs only the rainfall time series to estimate ground water recharge.
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Hillslope recharge & wetland influences in groundwater balance
• Daily transpiration rate of crack willows in the Waiwhero wetland could be more than four times that estimated for pasture (peak diff)
• A new model for estimating hillslope recharge in narrow valley alluvial aquifers
• Insights into high water losses from wetland willows
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River-aquifer modelling to set water allocation limits
• GNS 3D-model components (Annual average to daily time series):
– Rainfall recharge through soil (separate LCR model)
– Hillslope contribution (LCR field experiment)
– Groundwater extraction (LCR model of crop requirements)
– Side valley inputs (LCR separate model)
– Integrate with river ecology & flow preferences for fish (CAW)
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River-aquifer modelling: management scenarios
Hyatt
154.3
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1/07/2001 1/11/2001 1/03/2002 1/07/2002 1/11/2002 1/03/2003 1/07/2003
FinalCali
Final Cali +50 %Final Cali +100 %
1: Fully allocated (up to allocation limit as at present)
2: Fully irrigate all irrigable land
3: Raise riverbed levels by equivalent of last 40 years decline, 0.3 m av
4: Climate Change effects on water balance translated into pumpage and recharge
5: Effects of upstream land use change: Forestry vs pasture vs harvest scenarios
AboveTapawera
bridge/Rogers
Tapawera bridge
Below Tapawerabridge
Letterbox "Smith"
Above GlenraeStream
AboveWangapekaconfluence
36806 m3/driver gain
85708 m3/driver loss
62812 m3/driver gain
16243 m3/driver loss
8640m3 /d
river g
ain
W14
W25
W22
W36 W23
W28
W10
W20
W17
W40
W6
W15
Well ID
Abstraction rate used (m3/day)
6 1500 10 257.4 11 257.4 14 2802.6 15 193.2 16 308.4 17 244.2 20 180 22 1234.2 23 784.2 25 385.8 28 630 33 900 34 360 36 90
40 254.4
Tam
or R
iver
valle
y
Motueka River valley
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Aquatic Ecology Limits
Dean Olsen, Cawthron Institute
Contributors:Joe Hay, John Hayes, Rob Holmes, Aaron Quarterman, Roger Young, Rowan Strickland –CawthronRicky Olley, Gerry Closs - University of OtagoLawson Davey, Neil Deans – Fish & GameJoseph Thomas, Trevor James – TDCMike Stewart - GNS
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Motueka River
• Nationally significant brown trout fishery
• WCO in 2004– Protects:
• Water quantity
• Water quality (including temperature)
• Fish passage
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Groundwater allocation
• Groundwater (GW) – river linkages?
• Do GW inputs affect temperature patterns? – Consequences for trout habitat
suitability/growth?
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Do high temperatures limit trout growth?
Source: Olsen & Young (2009) Hydrogeology Journal 17: 175-183
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How do GW inputs affect temperature patterns?
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Radon in the U. Motueka River (courtesy Mike Stewart, GNS)
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222 R
n ()
Losing reachGaining reachBackwaters
Hinetai SpringBW1
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G7G1
BT=New G4
L5, L9, L3
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What temperature and radon tell us(courtesy Mike Stewart, GNS)
2. Radon reveals groundwater input
1. Temperature differences reveal groundwater input
3. In winter (Aug ’06), groundwater input at Tadmor confluence was steady at 2.5 ± 0.5 cumec (and contributed 10-25% of river flow)
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Groundwater allocation
• River & GW connected– Up to 25% of base flow from GW
– GW inputs affect water temp in gaining reaches
– Temperature effects not likely to substantially affect trout growth
⇒ River and GW should be managed together
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Minimum flow setting• Instream habitat modelling
– 1-D & 2-D at several sites
– Adult & juvenile trout
– Trout spawning
– Longfin eel, dwarf galaxias, upland bully
• Adult brown trout critical value
⇒ Minimum flow recommendations for WCO
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Fish movements
Adults- Spawning run
Spawning/nursery stream
Emigration?
• Habitat use by different life-stages
⇒ to inform flow decisions
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Fish movements• Radio-tagged adult trout
monitored for 11 months
• Moves up to 41 km recorded
• Most fish moved <1 km
• Movement affected bytemperature (↓) and discharge (↑)
• 60-70% mortality during 1-in-50 y flood
Source: Young et al. (2010) Transactions of the American Fisheries Society 139:137-146
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More on movements • Otolith microchemistry
– Natal stream
– Use of ocean/estuary
– Movements within catchment
• PIT tagging– Part of long-term study of
juvenile trout in Rainy River
– Emigration of juveniles from spawning stream
⇒ Methods have already been used to inform several hearings
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Water Economics issue• How do economic returns affect irrigators’ uses of water?
Major areas of investigation
•How do economic returns affect landowners and recreational uses of water?
• Economic drivers of groundwater use
Thank you to the ICM for supporting this work
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Water economics
• Aims to assess
- productive sector values;
- in situ and non-use values.
• Aims to assess trade offs
- within the productive sector
- between productive and in situ uses
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Productive sector water use: aim to assess economics of land use and water use
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Figure 1. Land use by agriculture 2003/2004 to 2007/2008,
Waimea Plains survey.
• Land owners have an economic incentive to intensify land use;
• For example land use in a longitudinal survey in part of the Waimea Plains between 2003/2004 to 2007/2008 (Figure 1) showed:- a decline in land use by dairy and apples- an increase in land use by horticulture and market gardening
Agricultural land use
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Figure 2. Land use by agriculture2003/2004 to 2007/2008, Waimea
Plains survey.
Agricultural land use
However, higher revenue land use don’t necessarily mean increased irrigated water use (Figure 2).
Main economic activityAverage revenue ($/ha) Average irrigation (m3/ha)
Horticulture 53500 1852
Market garden 46000 1855
Apples 32400 3250
Dairy 10200 3147
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Product price and income concentration
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2003/2004 2004/2005 2005/2006 2006/2007 2007/2008
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CE)Product price has some
control on income concentration (i.e. revenue per m3 of water used), e.g.• prices for apples went down in 2004/2005 (Figure 3);• income concentration increased2004/2005 to 2006/2007 (Figure 4).
Figure 3. Revenue to growers from apples.
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Figure 4. Income concentration, apples.
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Production and water use
However changes in farm operation can have a significant influence on water use, e.g. in one orchard (Figure 5):• significant decrease in production of apples, water use and land area 2004/2005 to 2006/2007 as blocks were removed; • water use increased in 2007/2008 due to development of blocks with new apple varieties Figure 5. Production and water use in one
apple orchard, Waimea Plains, 2003/2004 to 2007/2008.
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Economics and water management in the Motueka catchment
• Seeks to recognise economic values for the productive sector and in situ uses
• Seeks to balance productive sector uses against in situ uses
• A simple model, incorporating water economics, follows.
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Economics and water management in the Motueka catchment
• an analogy for the model is corporate book-keeping. Corporates summarise their status and activity as two numbers:
- assets, e.g. ‘capital value’;
- income;
• the financial performance of the corporate is judged on these two numbers.
• You need these two numbers to reduce the potential for corporates to fiddle the books!
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Motueka catchment water assets
• The Total Economic Value (TEV) method can be used to estimate the value of the water resource. This would include water bodies:
- surface water, groundwater and Tasman Bay
• the work of the ICM is crucial in identifying links within the catchment and between the catchment and the coastal environment
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Motueka catchment TEV and economic value of development
• For example, say you wanted to evaluate the economic effects on the water resource of conversion of sheep farming to horticulture. You could, for relevant water bodies;
- identify values of TEV;- identify values of income;- identify potential effects such as reduced base
flow and reduced fish numbers;- assess changes in TEV and income;- assess trade offs
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Motueka catchment TEV agriculture
Catchment land useLand area
(approx. ha)Value irrigation
($/ha)Income($/ha)
TEV Value ($M)
TEV income ($M/yr)
Dairy 650 12150 10000 7.9 6.5
Horticulture 5000 12150 50000 60.8 250
Sheep/beef 56380 100 8 5.6 0.5
Forestry 55565 0 0 0 0
DOC 88200 0 0 0 0
Total 205795 74.3 257
Thanks to Andrew Fenemor for estimates of approximate land area
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Lower Motueka river TEVfishing
Licences/yearLicence and gear
($/day)
Origin of fishing folk
travel cost ($/yr)
Cost($M/yr)
TEV value ($M)
TEVIncome($M/yr)
10000 31 50% Nelson 30 0.26
10 % Marlborough 80 0.1
20% rest of NZ 100 0.24
20% overseas 150 0365
Total 12.5 1.0
Thanks to Neil Deans for estimates of licences and origin
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Assess trade offs
• For example do you want to reduce the value of the Lower Motueka fishery by 50% with 100 ha of horticultural irrigation?
- TEV fishery loses approx $6 M- TEV horticulture gains approx $1.2 M
• For example do you want to reduce the value of the Lower Motueka fishery by 50% with 1000 ha of horticultural irrigation?
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Water Governance issue• What governance and policy approaches would improve effectiveness of water management plans and planning processes?
• Policy proposals to improve outcomes from water allocation (with Ecologic)
• Stakeholder Views of 5 South Island Catchment Management Processes
Major areas of investigation
Overall satisfaction with the water planning process by sector (Avge and STDEV)
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Local Gov Environment iw i W.U.S Instream
SectorsC
riter
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core
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vge)
Degree of satisfaction
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Motueka Stakeholder WorkshopEmerging issues
Flexibility – users & TDC
Security of supply – users
Land use impacts >> Water Quality
Means of stakeholder input
Allocation – competing uses
• including for in-stream uses
Resource rent
Water storage/augmentation
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Policy Approaches Discussed Stakeholder Water Management Committees – to roster water
√√ and manage water quality √ More transferability of water allocations – more support from
irrigators; temporary transfers preferred √ More explicit Security of Supply – better definition wanted √√ Water metering – should be mandatory for all √√ User pays for water management – preferred more by instream
users over permit holders √ Alternatives to First In/First Served – none stood out Separate permit for site-specific effects – not well understood
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Explore the governance factors that create or hinder effectiveness of water management plans and planning processes
Determine the priority attributes for optimal water governance
• Define good governance attributes from water management plans in the South Island
• 5 case studies in 4 jurisdictions
• Interviewed 56 stakeholders
• A cross section of stakeholders from:– Government - policy planners, resource scientists– Environmental agency - F+G, DoC– Iwi– Water user stakeholders – In-stream - NGOs, independents
• Derived 20 Good Governance attributes: Planning Process Attributes, Plan Design Attributes, Institutional Attributes
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Priorities for StakeholdersNeilan 2009
More holistic land-water planning is sought, especially by iwi
Limits on land activities and uses needed, as well as water body standards and limits
Faster planning processes needed to keep up with resource pressures
User-friendly science, widely available
Formalise involvement of water users & stakeholders in planning and implementation
Communication and engagement of water users and key stakeholders in decision-making during water stress periods creates cohesion and confidence in the water management regime