Large Farm Irrigation Coefficients #3
Comments
Using DEQ Irrigation withdrawals and Rainfall Deficit ApproachLarge Farmers Unreported 2002 <style> </style>
Large Farmers Unreported 2007 <style> </style>
Large Farmers Unreported 2012 <style> </style>
Large Farmers Unreported 2017 <style> </style>
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Using DEQ Total withdrawals and Rainfall Deficit ApproachLarge Farmers Unreported 2002 <style> </style>
Large Farmers Unreported 2007 <style> </style>
Large Farmers Unreported 2012 <style> </style>
Large Farmers Unreported 2017 <style> </style>
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Map of C_irr_lg
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Map of C_tot_lg |
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Using DEQ Irrigation withdrawals and Rainfall Deficit Approach (Updated)Large Farmers Unreported 2002 <style> </style>
Large Farmers Unreported 2007 <style> </style>
Large Farmers Unreported 2012 <style> </style>
Large Farmers Unreported 2017 <style> </style>
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MK TrendIrrigation Coefficient<style> </style>
Total Withdrawal Coefficient<style> </style>
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When to use/prefer methods:
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Bar Chart of Total State Irrigation by Year:
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Proposed Method for limits on counties with large unreported withdrawals
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@rburghol @julieshortridge @jdkleiner Months: June to AugustEffective Rainfall: Rainfall over 1.5 inches in 2 consecutive days is considered runoff <style> </style>
Months April to October (Previously in Presentation)<style> </style>
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Thanks Lal! This is interesting to see, and I think would put us in a much more reasonable ballpark of water demand. For instance, assuming June-August is 14 weeks, with a water demand of 1" per week for the first and last four weeks, and 1.5" per week for the middle six weeks, that would be a total water demand of 17". I'd be inclined to set crop water demand over that period to 20" as an initial test and see how our numbers compare. If we were using 30" before and an average effective rainfall of ~12", we're assuming ~18" of water put on. Now we'd be down to something like 8" of water put on, so I suspect our volume estimates would be around 8/18 = 44% of what they were. @rburghol what do you think? |
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@julieshortridge I think that makes lot of sense, both the final totals, and your idea to do more need in the middle weeks. Thanks to both of you! |
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Task: Develop county-level coefficients of large farm unreported irrigation withdrawals.
@laljeet @jdkleiner @rburghol
Wunr_lg = Wtotal - Wunr_sm - Wrep_irr
Wtotal = Total irrigated acres x Rainfall_Deficit
C_irr_lgc,y = Wunr_lg / Wrep_irr
C_tot_lgc,y = Wunr_lg / Wrep_tot
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