ENTIAT ENTIAT Watershed Planning Unit February 1, 2019 Presented - - PowerPoint PPT Presentation

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Dec 09, 2022 284 likes •377 views

ENTIAT ENTIAT Watershed Planning Unit February 1, 2019 Presented by Mike Kaputa Overview Current Reserve Accounting Framework What does the rule say? What has Chelan County been allocating? What is the current math? Future

SLIDE 1

ENTIAT ENTIAT

February 1, 2019 Presented by Mike Kaputa

Watershed Planning Unit

SLIDE 2

Overview

 Current Reserve Accounting Framework

 What does the rule say?  What has Chelan County been allocating?  What is the current math?

 Future Reserve Accounting Framework

 What new accounting methods are being considered?

 Questions and Discussion

SLIDE 3

WAC 173-546-070 – Reservation of water for specific future uses

 Up to 5 cfs total reserve  1 cfs for domestic and stockwater

 Up to ½ acre of lawn included in this portion of reserve  Indoor consumptive use = 35 gpd/house  Outdoor irrigation water duty specified in rule

 Range for Pasture / Turf at 31.68 inches (85% efficient) to 48.74 inches

(65% efficient)  3 cfs commercial agriculture  1 cfs commercial and light industrial

SLIDE 4

Current Entiat Reserve Math

 5,000 gpd / lot universal assumption generally

believed to be conservative

 Net indoor use not yet used  Outdoor acreage up to ½ acre not yet used  No express stockwater allocation

 Ecology hasn’t issued any permits against other

commercial portions of reserve, so no numeric tracking has been needed

SLIDE 5

Current Entiat Reserve Math

Year Debit (gpd) Debit (cfs) remaining (cfs) 2004 10000 0.01547 0.98453 2005 40000 0.06188 0.92265 2006 35000 0.054145 0.868505 2007 40000 0.06188 0.806625 2008 30000 0.04641 0.760215 2009 15000 0.023205 0.73701 2010 35000 0.054145 0.682865 2011 40000 0.06188 0.620985 2012 25000 0.038675 0.58231 2013 25000 0.038675 0.543635 2014 35000 0.054145 0.48949 2015 30000 0.04641 0.44308 Total 360000 0.55692

SLIDE 6

Why Consider Changes

 Reserve is diminishing based on conservative

assumptions

 Chelan County is working on a 2020 Reserve

Accounting effort that is required in Wenatchee but being extended County-wide

 New Ecology policies are emerging with the

passage of the “Hirst fix” in RCW 90.94

SLIDE 7

Future Reserve Accounting

 35 gpd consumptive use used for indoor use  Aerial photo lawn survey used for a representative

sample to estimate outdoor use instead of ½ acre/house

 For example, similar effort in Wenatchee subbasins yielded:

 0.12 acres in Lower Wenatchee  0.06 acres in Icicle  0.17 acres in Mission  0.08 acres in Chumstick

 Bring results back to the Entiat Planning Unit for review

later in 2019

SLIDE 8

Questions?

Mike Kaputa

mike.kaputa@co.chelan.wa.us 509.670.6935 https://www.co.chelan.wa.us/natural-resources