glove-modflow-spdss.pdf

8/8/2019 Glove-Modflow-SPDSS.pdf

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Analytic Vs Numeric Analytic Vs NumericGround Water ModelsGround Water Models

Ray R. Bennett, PERay R. Bennett, PE

Colorado Division of WaterColorado Division of Water

ResourcesResources


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Example Analytic (Glover)Example Analytic (Glover)

Application Application


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Analytic (Glover) Analytic (Glover)

Depletion (q) is a function of:Depletion (q) is a function of:

–– Pumping (Q)Pumping (Q)–– Transmissitivity (T)Transmissitivity (T)

–– Specific Yield (Sy)Specific Yield (Sy)

–– Distance from well to river (x)Distance from well to river (x)

–– Distance to Aquifer Boundary (w)Distance to Aquifer Boundary (w)

Data is assigned by Aquifer (1 value)Data is assigned by Aquifer (1 value)

RELATIVELY SIMPLERELATIVELY SIMPLE


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Analytical (Glover) Analytical (Glover)Key AssumptionsKey Assumptions

Conductivity (K) is ConstantConductivity (K) is Constant

Uniform Aquifer ThicknessUniform Aquifer Thickness

–– Transmissitivity is ConstantTransmissitivity is Constant

Flat Water TableFlat Water TableStream is Fully PenetratingStream is Fully Penetrating


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Analytical (Glover) Results Analytical (Glover) ResultsResponse from Pumping in Month 1 OnlyResponse from Pumping in Month 1 Only

URF 6400511

0

2

4

6

8

10

1214

16

18

20

0 5 10 15 20 25 30 35 40

Month

V o l u m e o f D e p l e t i o n

( % )

Volume of Depletion from AWAS

Adjusted to 100% (URF)


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Example Numeric ModelExample Numeric Model


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Numerical (Modflow) ModelNumerical (Modflow) Model Depletion is still a function of:Depletion is still a function of:

–– Pumping (Q)Pumping (Q)

–– Hydraulic Conductivity (K)Hydraulic Conductivity (K)

–– Aquifer Thickness (b)Aquifer Thickness (b)

–– Specific Yield (Specific Yield (Sy) or StorageSy) or Storage Coefficient (S)Coefficient (S)

–– Distance from well to river (x)Distance from well to river (x)

–– Distance to Boundary (w)Distance to Boundary (w) Data is assigned by Model Cell (1,000Data is assigned by Model Cell (1,000’ ’ s)s)

Might include complex geometry, multiple layers,Might include complex geometry, multiple layers,boundary conditions, partially penetratingboundary conditions, partially penetrating

streams, ET from GW, subirrigation, impact onstreams, ET from GW, subirrigation, impact oncanals,canals, ……..

LOTS of WORKLOTS of WORK


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Numerical (Modflow) ResultsNumerical (Modflow) Results Stream DepletionStream Depletion

–– By stream Reach (not a point)By stream Reach (not a point) Water LevelsWater Levels

Ground Water BalanceGround Water Balance

Stream Water BalanceStream Water Balance–– Phreatophyte CUPhreatophyte CU

–– SubirrigationSubirrigation

–– Complex Geology (faulting)Complex Geology (faulting)–– Complex BoundariesComplex Boundaries

–– Multiple, Layered AquifersMultiple, Layered Aquifers

URF 6400511

0

2

4

6

8

10

12

14

16

18

20

0 5 10 15 20 25 30 35 40

Month

V o l u m e o f

D e p l e t i o n ( % )

Volume of Depletion from AWAS

Adjusted to 100% (URF)


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Comparison SummaryComparison Summary

Item Analytical NumericalStream Depletion Yes Yes

Assumptions High Low-High

Water Levels No Yes

Complex Geology No Yes

Dry Stream No YesMultiple Aquifers No Yes

Effort Low Med-High


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South Platte DSS

R e p u

b l i c a n R

i v e r

Division 1 except Republican (WD 65) and North Platte (WD 47)

N o r

t h P l a

t t e

S

o u t h

P l a t t e

Colorado Water Conservation Board and Division of Water Resources


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SPDSSSPDSSMajor ComponentsMajor Components

DataData -- Tabular and MapsTabular and Maps

New DataNew Data -- Irrigated Lands,Irrigated Lands,

stream gages, aquifer data, andstream gages, aquifer data, and

observation wellsobservation wells ToolsTools –– CU, SW, GWCU, SW, GW

User InvolvementUser Involvement

Documentation & ProductDocumentation & Product

DistributionDistribution


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DSS Components

HydroBaseHydroBase Field andHistorical Datadmis

d m i s

d m i s

d m i s

d m

i s

d m i s

dmis

d m i s

Surface Water

Planning

ModelTSTools

Water Budget

Model

Water Rights

AdminCU Model

Other User

Components

Groundwater

Planning

Model

= DSS Integration Component


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Tabular DataTabular Data

StationsStations

–– StreamflowStreamflow–– Climate (temp,Climate (temp,

ppt., evap.)ppt., evap.)

StructuresStructures–– DiversionsDiversions

–– ReservoirsReservoirs

–– Instream FlowsInstream Flows Water RightsWater Rights

–– TransactionTransaction

–– NetNet

Ground WaterGround Water

–– Water LevelsWater Levels–– Pumping TestsPumping Tests

CallsCalls

–– TributaryTributary

–– MainstemMainstem

OtherOther

–– AgriculturalAgriculturalStatisticsStatistics

–– Crop GrowthCrop Growth

CoefficientsCoefficients


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Tabular DataTabular DataInternet (WWW)Internet (WWW)


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Spatial (Map) DataSpatial (Map) Data BasemapBasemap

–– HydrologyHydrology–– RoadsRoads

–– Cities and TownsCities and Towns

–– Public Land SurveyPublic Land Survey(T(T--RR--S)S)

StationsStations

–– DiversionsDiversions–– ReservoirsReservoirs

–– Instream FlowsInstream Flows

–– ClimateClimate

Irrigated AcreageIrrigated Acreage

–– Water SourceWater Source–– Crop TypeCrop Type

–– Irrigation MethodIrrigation Method

OtherOther–– AverageAverage

precipitationprecipitation

–– AverageAverageevaporationevaporation

–– CanalsCanals

–– DrainsDrains


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Spatial DataSpatial DataIrrigated Acreage MappingIrrigated Acreage Mapping

Irrigated Area,

Crop Type,

Irrigation Method,

Water Supply


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Soil

Data

Irrigated

Acreage

and Crop

Type

0

2000

4000

6000

8000

10000

12000

14000

1 9 7 6

1 9 7 7

1 9 7 8

1 9 7 9

1 9 8 0

1 9 8 1

1 9 8 2

1 9 8 3

1 9 8 4

1 9 8 5

1 9 8 6

1 9 8 7

1 9 8 8

1 9 8 9

1 9 9 0

1 9 9 1

1 9 9 2

1 9 9 3

1 9 9 4

1 9 9 5

1 9 9 6

1 9 9 7

1 9 9 8

1 9 9 9

2 0 0 0

2 0 0 1

Surface Water Supply Data

0

10

20

30

40

50

60

70

80

90

1980 1981198219831984 1985 1986198719881989 1990 1991199219931994 1995199619971998 1999 2000200120022003

Climate Data

PARCEL CROP_TYPE IRRIGATION ACREAGE PERIMETER

10101 Alfalfa Sprinkler 131.832 2610.943

10102 Corn Flood 135.253 2650.783


10104 Corn Sprinkler 123.794 2532.175

10105 Corn Flood 133.197 2619.833

10106 Small Grains Sprinkler 135.335 2649.933

10107 Alfalfa Flood 134.877 2637.105

10108 Alfalfa Flood 134.181 2637.852

10109 Small Grains Flood 125.197 2542.805


Irrigation Method Ditch Efficiencies

Locally Calibrated

Blaney-Criddle Crop

Coefficients

PCU for Alfalfa at the Fort Collins Climate Station

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

P o t e n t i a l C o n s u m p t i v e U s e ( f e e t

ASCE S tandard ized Modified Blaney-C riddle,T R-21 Coe ff.

Bri dge on County Road 56 over the Larim er County Canal

Consumptive UseConsumptive Use

StateCUStateCU


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StateCU Typical ResultsStateCU Typical Results

CU by Water Supply (SW and GW)CU by Water Supply (SW and GW)

Figure 5

Phase 5 CU by Water Supply

0

100,000

200,000

300,000

400,000

500,000

600,000

700,000

800,000

900,000

1,000,000

1 9 5 0

1 9 5 5

1 9 6 0

1 9 6 5

1 9 7 0

1 9 7 5

1 9 8 0

1 9 8 5

1 9 9 0

1 9 9 5

2 0 0 0

2 0 0 5

Year

C U ( A c - F

t )

Surface Water Ground Water


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StateMod

Colorado’s Water Resources Planning Model

Ray Bennett, Colorado Division of Water Resources


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StateMod Major Features

•Network System

•Monthly or Daily Time Step

•Prior Appropriation Doctrine

•Structure Types

Diversions, Reservoirs,

Instream Flows, Wells

Plans

•Operational Rules•Complex water operations

•Graphical User Interface


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StateMod Features (cont.....)

•Creates Base or Natural Flows

•Efficient Solution Method – Direct Solution Algorithm – Modified Direct Solution Algorithm

•Variable Efficiency

•Soil Moisture Accounting

•Plan Accounting

•Call Reporting


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StateMod Typical ResultsStateMod Typical ResultsCompact Delivery Vs Compact CallCompact Delivery Vs Compact Call

9000

9500

10000

10500

11000

11500

12000

1/1/1850 1/1/1930 1/1/1950 1/1/1960 1/1/1970 1/1/1995

Compact Call Date

Y i e l d ( K

a f / y r )


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Colorado’s Ground Water ModelModflow (USGS)

Alluvial

Aquifer


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Modflow FeaturesModflow Features

GeologyGeology

Aquifer ParametersAquifer Parameters PumpingPumping

RechargeRecharge

Boundary ConditionsBoundary Conditions

Streamflows and DiversionsStreamflows and Diversions

SpringsSprings

DrainsDrains

EvapotranspirationEvapotranspiration SubirrigationSubirrigation


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Modflow Typical ResultsModflow Typical ResultsProposed Pumping ImpactProposed Pumping Impact


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More about SPDSSMore about SPDSS W e b Si t e W e b Si t e

–– http://cdss.state.co.ushttp://cdss.state.co.us DW R DW R

–– Ray Bennett (303) 866Ray Bennett (303) 866 -- 35853585

–– [email protected]@state.co.us CW CB CW CB

–– Ray Alvarado (303) 866Ray Alvarado (303) 866 -- 35173517

–– [email protected]@state.co.us

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