ESPAM2 Water Budget Status

ESHMC

21 September 2010

B. Contor

!

What do I mean by "water budget?"

• All required input to MKMOD

• MKMOD calculates all flux across land surface EXCEPT TARGETS

• Target fluxes are applied separately– spring discharges– Snake River gains and losses

• Aquifer heads provide additional targets

15 Files Comprise the "Water Budget"

• E100910A.cel• E100910A.cnl• E100910A.div• E100910A.ent• E100910A.eff• E100910A.eti• E100910A.fpt• E100910A.iar

• E100910A.mdl• E100910A.nir• E100910A.off• E100910A.pch• E100910A.pre• E100910A.red• E100910A.sol• E100910A.trb

E100910A.cel

• This file contains the square footage of each model cell, and whether the cell is active or inactive.

• It reflects the boundary changes Allan presented last spring.

E100910A.cnl

• This file contains the cell locations and leakage fractions for model cells with leaky canals.

• Nearly all entities have one or two major canals represented as leaky.

• The data set accommodates time-varying leakage, but I have held them constant for all stress periods, per the Ad Hoc memo.

E100910A.div

• This file contains diversion volume for each surface-water entity, for each stress period.

• Returns are zeroed as a fail-safe for the On-Farm algorithm.

E100910A.ent

• This file contains information about the surface-water entities and groundwater polygons (entities) to which all irrigated parcels are assigned.– water source– ET adjustment factors– Sprinkler percentage (and changes through

time)

E100910A.eff

• I know nothing.

• Ask Allan & Willem.

E100910A.eti

• This file contains unique irrigated-et depth for every cell, for every stress period– MKMOD decides when, where and how to

apply it– Based on National Ag Statistics Service crop

mix and ET-Idaho evapotranspiration depths.

E100910A.fpt

• FPT means "fixed point"

• Any flux that is independent of MKMOD calculations is eligible– wetlands– urban/industrial areas– exchange wells

• WD 01• Mud Lake

• Some indelicacy with data flags

E100910A.iar

• Irrigated lands by model cell– square feet, entity, source, source fraction

• Four data sets: 1980, 1992, 2000, 2006

• We're knocking on the door of 2002 completion

• Possibly in the near future we will attempt a repair of 1986?

E100910A.mdl

• Model simulation data– Brief background information– stress period lengths– Rows, columns, layers– PEST multipliers for non-irrigated recharge, by

soil type– PEST multiplier for fixed points with flag "W"

E100910A.mdl (2)

"ESPAM2 water budget using NIR values (ESPAM1 algorithm)from Contor, 3 June 2010. Reflects round 2 adjustments, corrections to irrigated lands, zero returns as failsafe for on-farm. Identical to P100827A exceptfor refinements described in E100910A.readme.txt. No *.eff file supplied by IWRRI."

E100910A.nir

• Non-irrigated recharge depth

• One value for each model cell, for each stress period

• Depends on general soil type and precipitation depth

• Non-linear ESPAM1.1 algorithm was applied to PRISM precipitation depths

E100910A.off

• Offsite groundwater pumping

• This means the wells are distant from the irrigated lands

• MKMOD uses the pumped volumes in irrigated-lands and canal-seepage calculations

• Differ from exchange wells in that exchange-well volumes are already in the diversions data

E100910A.pch

• Perched river seepage

• Unique value for each model cell, for each stress period

• This is actually all non-Snake seepage, whether perched or not.

• No Snake-River seepage is included, whether perched or not.– Snake seepage is included in calibration targets

E100910A.pre

• Precipitation depth for every model cell, every stress period.

• Used in irrigated-lands calculations

• MKMOD also uses for sense check w/ non-irrigated recharge

• Data are from PRISM

E100910A.red

• Reduction for non-irrigated inclusions

• One value for each stress period, for sprinklers and for gravity– we didn't have enough data so all the

sprinkler values = gravity values

• Calculated by comparing hand-drawn polygons with data-set polygons in a statistical sample (100 one-mile squares) for all irrigated lands data sets.

E100910A.sol

• Generalized soil type by model cell– lava rock, thin soil, thick soil

• Based on RASA 1406 (Garabedian) maps

• Used in selecting parameters for *.nir calculation

• Used to assign PEST multipliers– Currently set to 11 zones

E100910A.trb

• Tributary valley underflow

• Annual values based on RASA 1406

• no intra-year variability– we know it exists but we don't have adequate data

• inter-year variability based on dampened Silver Creek hydrograph– Silver Creek is spring-fed at the mouth of a

tributary basin

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