Visual MODFLOW Multi-Node Wells Tutorial
Contents
1. 0 00 ft 3 MN w 10503153664 00 ft 3 Storage 0 00 ft 3 day Constant Head 0 00 ft 3 day Di rainy d ET 0 00 ft 3 day River Leakage 0 00 ft 3 day Stream Leakage 0 00 ft 3 day General Head 0 00 ft 3 day Total IN 4784506 00 t 3 day UT Stream Leakage 0 00 ft 3 General Head 0 00 ft 3 Total IN 2746400000000 00 t 3 UT Storage 117671232000 ft 3 Constant Head 1477000000000 00 ft 3 Wells 0 00 ft 3 Drains 804731289600 00 ft 3 MNW 463486156800 00 ft 3 Recharge 0 00 ft 3 Storage 1054272 38 ft 3 day Constant Head 1690529 13 ft 3 day Wells 0 00 ft 3 day in ER Qqooo 4 MNW 1089713 88 ft 3 day ET 000 t 3 da River Leakage 0 00 ft 3 day Stream Leakage 0 00 ft 3 day General Head 0 00 ft 3 day Total OUT 4784504 00 ft 3 day General Head 0 00 ft 3 Total OUT 2746400000000 00 ft 3 IN OUT 1572864 00 ft 3 IN OUT 2 00 ft 3 day Discrepancy 0 00 Discrepancy 0 00 Multi node wells appear in the mass balance as MNW term Mutli node wells occur in both the inflow and the outflow portions of the mass balance The total rate of outflow from multi node wells was 1 089 713 88 ft day and a total inflow was about 3 786 86 ft day which yields a net discharge rate of 1 085 950 02 ft day This demonstrates how there can still be net discharge with intraborehole flow ocurring b2. This tutorial assumes that you are already familiar with the Visual MODFLOW interface and with the process of building a groundwater model If you are not familiar with Visual MODFLOW it is recommended that you work through the Visual MODFLOW demo tutorial first About the Model The model used in this tutorial is based on the model published in User Guide for the Drawdown Limited Multi Node Well MNW Package for the U S Geological Survey s Modular Three Dimensional Finite Difference Ground Water Flow Model Versions MODFLOW 96 and MODFLOW 2000 by K J Halford and R T Hanson You will see that the results produced in Visual MODFLOW are very similar to those published in the original USGS document Model Overview The system consists of two aquifers that are separated by a 50 foot thick confining unit The upper aquifer is unconfined has a hydraulic conductivity of 60 ft d and has a uniform base of 50 ft above the datum The lower aquifer is confined and has a transmissivity of 15 000 ft day The model uses the quasi three dimensional approach in which the confining unit is simply represented by the vertical conductance between layers Storage coefficients of 0 05 and 0 0001 were assigned to layers 1 and 2 respectively The 66 mi area of the model was divided into 21 rows of 14 columns Uniform square cells measured 2 500 ft on each side were used through out the area Specified heads and drains are assigned in layer 1 and are
3. maintained at the same elevations for all stress periods A period of 1 000 970 days was simulated with 5 stress periods see table below Stress From days To days Conditions Period 500 000 1 000 000 Steady State Multi Node Well MNW Tutorial 2 Recharge during stress periods 1 and 2 was 7 inches per year No pumpage was extracted during stress period 1 but two multi node wells were simulated About 950 000 ft d of pumpage was extracted during stress period 2 this is about 35 of the total volumetric budget Uniform recharge rates of 2 0 and 12 in year were applied during stress periods 3 4 and 5 respectivley In addition to the simulation of two multi node wells there are 13 other single node wells that have a combined discharge of 935 350 ft d for stress periods 2 through Reference User Guide for the Drawdown Limited Multi Node Well MNW Package for the U S Geological Survey s Modular Three Dimensional Finite Difference Ground Water Flow Model Versions MODFLOW 96 and MODFLOW 2000 by K J Halford and R T Hanson Terms and Notations For the purposes of this tutorial the following terms and notations will be used Type type in the given word or value Select click the left mouse button where indicated press the Tab key 57 Click the left mouse button where indicated double click the left mouse button where indicated denotes a button to click on either in a window or in the menu ba
4. 596972 Proportional to ce 28956 63 385802 Proportional to ce 6100 655 38666 12 Proportional to ce 139198 385802 Proportional to ce 21395 25 38666 12 Proportional to ce 28956 63 3110475 Proportional to ce 6272 504 31190 67 Proportional to ce Iv 13747 95 31190857 Proportional to ce 21309 33 3110475 Proportional to ce 163257 21137 48 Proportional to 212234 16067 92 Proportional to ce Es Done Well by name n a Screened Intervals b DK Common MNW Apply screen s for all selected wells Apply Pumping Schedule Common MNW b OK IS Start da b 500000 1000000 1000060 1000240 Apply schedule s for all selected wells Apply End da 500000 1000000 1000060 1000240 1000970 1 Rate ft 3 d 0 100300 100300 100300 100300 Current well 1184 500 50 OK Cancel The MNW options can be shown by selecting the MNW button from the main toolbar DPA KS a nw This button has already been enabled for you and all MNW parameters have been defined When this button is selected additional options become available in the well table screen interval table and pumping schedule table In addition global MNW options become available These options are described briefly in the following sections of this tutorial Viewing the Well Table All the pumping wells in the model are stored in th
5. ET OCMC ELUM es 2 About the Model 2 Mode OY cao mm 2 Terms and NOUONS osos scolis bt wae ek he UR iq VA RE ueni que uv 3 oos uxo oppo aei ec ale 3 Viewine the Well o dI qo E dri e dod ead ed dtd See PR 6 Viewing MNW Global Options n 7 Viewing MNW Screen Options 0 ee eens 7 Viewing MNW Pumping Schedule Options llle 8 Applyine Zones Using ZoneBU dbet tans Bead Ree E hd 8 Running the Model 6 10 pesca a phe eras MESES toa Viewing Zone Budget Flow 0 ccc eee eens 12 Viewine Mass Balance saa Vee ee 14 Waterloo Hydrogeologic Introduction This document contains a step by step tutorial to illustrate the capabilities of simulating multi node wells in Visual MODFLOW More specifically this tutorial takes you through a pre built model that simulates intraborehole flow in wells with screens that span multiple layers by using the MODFLOW flow engine with the USGS Multiple Node Well MNW package In this tutorial you will View various input data required by the multi node well package View a zone budget configuration designed to calculate intraborehole flow occurring between layers in a multi node well e View simulation output using Zone Budget time step flow charts View simulation output using the Mass Balance report
6. Layer 1 and Zone 3 was assigned to Layer 2 First we will turn off the Wells layer F9 Overlay button Deselect BC F Wells button To view the ZoneBudget configuration ZBud from the main menu Database from the side menu Multi Node Well MNW Tutorial 8 The Zone Database dialog will display Two zones were created to represent Layer 1 blue and Layer 2 green of Well 133 E Select zones e Hl Zone Description E 2 22 Layerl m3 Bl Zone Layer2 OK Cancel Help close the dialog When viewing Layer 1 of the grid you will notice that the cell containing Well 133 was assigned Zone 2 blue You will notice that the cell containing Well 133 MNW was assigned Zone 3 green You can view this configuration in a cross section view To do so View Row from the side menu gt Row 3 from the grid File Grid Wells Properties Boundaries Particles ZBud Tools Help View Column Database l X 33625 7 Y 46250 0 Z 841 3 Row 1 3 Column J Layer F1 F2 F3 FY F5 F6 F F8 F3 Z A Vert Over g MAMRE ale E Zone budget edit module In cross section view you can see that Zone 2 was assigned to
7. Visual MODFLOW Multi Node Wells ES x o 2 Bons Current well 1312 Common package 1312 28956 63 6205 441 14076 92 21309 33 28956 63 6100 655 13919 8 21395 25 28956 63 6272 504 13747 95 21309 33 16325 7 21223 4 EA lt Apply schedule s for all selected wells Apply 0 Done MNW Settings 46393 06 45923 08 45969 72 38580 2 38666 12 38580 2 38666 12 31104 75 31190 67 31190 67 31104 75 21137 48 16067 92 Tutorial Screened Intervals b Common MNWw 500 Top ft Bottom ft Rwelf gt 0 0 5 Proportional to cell transmissivity Proportional to cell transmissivity Proportional to cell transmissivity Proportional to cell transmissivity Apply screen s for all selected wells Apply Proportional to cell transmissivity amp Proportional to cell transmissivity Proportional to cell transmissivity Proportional to cell transmissivity Ems che Proportional to cell transmissivity Equally over screen E Proportional to cell transmissivity Fk THU Proportional to cell transmissivity Rada NT gt 0 Proportional to cell transmissivity Pumping Schedule b 500000 Proportional to cell transmissivity 1000000 Proportional to cell transmissivity 1000060 1000240 1000970 1 50 OK Cancel Waterloo Hydrogeologic TABLE OF CONTENTS N
8. above you will see an OUT bar for MNW Although the OUT value can be estimated by reading the Y axis you can easily display the total OUT value by clicking on the bar 13 on Red MNW bar Toned As indicated in the call out box about 16 100 ft day moved out of Zone 2 Layer 1 Next we will plot the flow for Zone 3 Layer 2 Zone from the zones frame BHAS BE OB e See Tee 500000 sef Tren In the bar chart above you will see an IN bar for MNW By clicking on the bar you will see that approximately 16 100 ft day moved into Zone 3 Layer 2 By comparing the flow for both zones we can infer that 16 100 ft day moved through the well as intraborehole flow from the upper aquifer Layer 1 to the lower aquifer Layer 2 during the non pumping time step To close the Zone Budget MODFLOW window gt File Exit from the main menu Viewing Mass Balance Report To view the Mass Balance report Zone Budget from the side menu combobox Multi Node Well MNW Tutorial 14 View Column Mass Balance Mass Balance from side menu Last Time button to view the rates for the last time step Mass Balance Flow t Stress Period 5 Time Step 50 E Time days 10009699 x Cumulative Volumes Report ft 3 Rates for Time Step Report ft 3 day IN IN Storage 506169056 00 ft 3 Constant Head 0 00 ft 3 Wells 0 00 ft 3 Drains
9. e well table When a well row is selected its screen interval and pumping schedule data is shown in the adjacent Screen Intervals and Pumping Schedule tables Multi Node Well MNW Tutorial i Equally over screen Active MNW Well name CWC Distribution 1184 8764 321 8678 396 Proportional to cell transmissivity 1312 28956 63 46141 57 Proportional to cell transmissivity gt Iv 133 6205 441 46393 06 Proportional to cell transmissivity 14076 32 4592308 Proportional to cell transmissivity 21309 33 4596972 Proportional to cell transmissivity 28956 63 38580 2 Proportional to cell transmissivity 6100 655 38666 12 Proportional to cell transmissivity 13919 8 38580 2 Proportional to cell transmissivity 21395 25 3866612 Proportional to cell transmissivity 28956 63 31104 75 Proportional to cell transmissivity 6272 504 31190 67 Proportional to cell transmissivity 13747 95 31190 67 Proportional to cell transmissivity 21309 33 31104 75 Proportional to cell transmissivity 16325 7 21137 48 Proportional to cell transmissivity 21223 4 16067 92 Proportional to cell transmissivity zi The MNW column allows you to include exclude the well in from the MNW package by selecting deselecting the corresponding checkbox In this tutorial all wells will be simulated using the MNW package The CWC Distribution column allows you to select the meth
10. etween selected model layers in multi node wells This concludes the MNW tutorial 15
11. he Pumping Schedule frame Pumping Schedule be gt Em ER Common eo e nn Au UID 433 tupe water level elevation limits type pumping pumping 0 17190 Drawdow 50 1E16 Percen ol 45 Bh 1500000 1000000 17190 Drawdow 50 1E16 Percen ol 45 1000000 1000060 17190 Drawdow 50 Percen ol 45 1000060 1000240 17190 Drawdow 50 Percen al 45 11000240 1000970 1 17190 Drawdow 50 Percen ol 45 The pumping schedule grid will exand to allow for input of Rskin and Tskin values draw down constraints pumping constraints and water quality options for each step in the pumping schedule All these values have already been defined for you For more information on these options please refer to the USGS User Guide for the Drawdown Limited Multi Node Well MNW Package or the Visual MODFLOW User s Manual At this point feel free to explore the different MNW settings for each well in the well table To close the Edit Well window Ok button Before continuing change the input view from row view cross section view back to Layer View planar view View Layer button from the side menu Layer in the model grid Applying Zones Using ZoneBudget ZoneBudget will be used in this simulation to determine the intraborehole flow in multi node Well 133 during the first time step when there is no pumpage Two zones have been defined for the cells that represent Well 133 Zone 2 was assigned to
12. ls Help a Head m m Select A m Column J Layer 1 Output Time 500000 00000 day Stress period 1 Time step 15 Viewing Zone Budget Flow Graph To view the flow zone budget graph Graphs Zone Budget Flow from the main menu The Zone Budget MODFLOW window will open displaying a series of graphs Close the following graphs so that only the Time Step graph is displayed Percent Discrepancy IN OUT Time Series Your screen should look similar to the screen shown in the figure below Multi Node Well MNW Tutorial 12 A fore ee Propet ES Crt ents and Suet igya E Hosp IPC rane IPTE V rcd Tires 500000 55 Time c CONSTANTHEAD DRANS RECHARGE e Bub sint Heu Max This graph plots a bar chart of the flow IN and OUT of the system of the selected zone through the individual sources and sinks flow boundary conditions and storage for selected output times We are interested in the flow IN and OUT of Layer 1 Zone 2 and Layer 2 Zone 3 for Multi Node Wells during time step 1 no pumpage To plot the flow for Zone 2 Zone 2 from the zones frame indicated in the image below See me 50000 sees Tans x b Zone Jord Ds cor Total IH x STORAGE CONSTANTHEAD DRANS RECHARGE e Bub sein Hu Max In the bar chart
13. od in which Cell to Well Conductance is distributed along the length of the screen In this example we will use the Proportional to Cell Transmissivity option Viewing MNW Global Options To view the MNW global options applies to all wells included in MNW package Package tab located beside the Common tab beneath the main toolbar Common MAW package MAW Settings Setng Vale Skir Reference SP Here you can specify the well loss options for all wells selected as MNW Choose between Skin Linear and Nonlinear from the Loss Type combobox This tutorial will use the simple skin coefficient Skin for well losses Viewing MNW Screen Options To view the MNW screen options MNW tab located beside the Common tab in the screened intervals frame Screened Intervals k kK INED Top t j Botom ft ra 0 05 Apply screen s for all selected wells Apply The Screened Intervals table displays the screen interval of the selected well The screen is also shown graphically in the adjacent well diagram The multi node well package requires that each well has only one screen interval Moreover the well radius R Well for this interval must be specified All screen intervals and R Well values have already been defined for you Viewing MNW Pumping Schedule Options To view the MNW Pumping Schedule options MNW tab located beside the Common tab in t
14. roperties Boundaries Particles zBud Tools Help view Row View Layer met Pump Wells Add Well Delete Well gt Edit wel Graph Move Well Copy Well Wells Onoff ir ESNEEBEBN TM OAM X 8596 5 Ns Zt R OW 1 5000 20000 25000 30000 35000 Column 7 Layer 1 Well edit module The two multi node wells are indicated in the image above Both MNW wells are screened across both the top and bottom aquifer This can be seen by viewing a cross section of this row To do so View Row button from side menu Row 3 from the grid File Grid Wells Properties Boundaries Particles ZBud Tools Help view Row ae Next 7 Grid nactive Cells gt Edit Grid gt I Edit Extents Import Elevation ssign Elevation gt Grid edit module Next we will take a look at the different well parameters required by the MNW package MNW data input is facilitated through the newly improved Edit Add well window To load this window Database button from side menu to open the Edit Well window ee EEE Bmw Common MNW package Display well as Co ordinat Fin Elevation Model Depth to World v 1184 9764 321 8678 396 Proportional to ce 1312 28956 63 46141 57 Proportional to ce 6205 441 46393 06 Proportional to ce 14076 92 4592308 Proportional to ce 21309 33 4
15. rs The bold faced type indicates menu or window items to click on or values to type in Getting Started To start this tutorial oe by the Visual MODFLOW program icon to start the Visual MODFLOW program File gt Open from the Main Menu Browse to the location of the tutorial files From this folder open the MNW folder select the MNW V mod vmf file and Open MNW Input First we will take a look at the model input To view the input screen Input from the main menu File Grid Wells Properties Boundaries Particles ZBud Tools Help S view Row view Layer e Grid nactive Cells gt I Edit Grid Smoothing I it Extents mport Elevation Assign Elevation gt n ii 78 m Column J Layer 1 Grid edit module This image displays the grid of the model as you can see the model domain is 21 rows by 14 columns by 2 layers Cell size is 2 500 x 2 500 feet Total area is 66 mi The property values and boundary conditions described in the model overview have already been defined for you Before proceeding take a minute and view the different input data for properties and boundary conditions i e constant head conductivity drain etc by using the combo box in the side menu Next we will view the input for pumping wells To do so Wells Pumping Wells from the main menu Multi Node Well MNW Tutorial 4 File Grid Wells P
16. the cell in the upper layer and Zone 3 was assigned to the cell in the lower layer Next we will run the model using the MODFLOW 2000 flow engine and ZoneBudget and then view the output results Before continuing change the input view from row view cross section view back to Layer View planar view View Layer button from the side menu Layer in the model grid Running the Model To Run the model F10 Main Menu button gt Yes button from the warning message to save the project from the main menu Run from the top menu Multi Node Well MNW Tutorial 10 Engines to Run iM zoneBudget MT3DMS Cancel Advanced gt gt Auto start engines In the Engines to Run dialog select the following options MODFLOW 2000 if not already selected ZoneBudget if not already selected Translate amp Run Visual MODFLOW will then Translate the Visual MODFLOW data set into the standard data input files required for the selected Numeric Engines and then Run the simulations in a seperate window labelled VMEngines MNW Output Once the model has converged you may Close the VMEngines Output from the top menu bar of the Main Menu Upon entering the Output section Visual MODFLOW will automatically load the available Output files for Head HDS for all output times Once these data files are loaded the Output screen will appear 11 File Maps Graphs Too
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