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
Party Responsibly!