TUTORIAL - Subsidence & Time Variant Data using the ESdat Environmental Database System For use with ESDAT version 5 (version 4 software updates available from www.esdat.com.au)
Tutorial 3-5 Subsidence and Time-variant Data Table of Contents Summary...2 Pre-requisites...2 Key Learning...2 Introduction...3 Exercises...4 Exercise One: Importing and viewing Subsidence and Time-variant Data...4 Exercise Two: Water Level Correction with Time Variant Data...7 Copyright @EarthScience Information Systems P a g e 1
Summary This tutorial: details the method for incorporating changes in elevation of reference points (such as altered or damaged groundwater well collars) in order to present comparable elevation data uses the Sample Hydrogeology and Contam database (and therefore can be used with the demonstration version of ESdat) is completed using the Access version of ESdat, however methods described in this tutorial apply to both Access and SQL Server versions of ESdat requires approximately 30 minutes to complete Pre-requisites It is assumed the user has previously completed: Tutorial 1 Introducing ESdat Tutorial 3-4 and 3-4a should be completed in conjunction with this tutorial. For a full list of the Tutorials available for use with ESdat, please see the Tutorial List. Key Learning Following completion of this tutorial, the user will have developed skills in the following: importing and viewing time variant data correcting water levels to account for changed reference point elevation Copyright @EarthScience Information Systems P a g e 2
Introduction Established (surveyed) elevation reference points can vary for a variety of reasons. For example, subsidence (particularly at mine sites), damage (e.g. earth moving plant damaging groundwater wells) or changes in site topography (e.g. earthworks programs) can alter reference points such as groundwater well collar heights. ESdat allows storage of time varying reference point elevation data, which can be used to calculate corrected water levels. The exercises are summarised as follows: Exercise 1 Importation of time varied elevation and Top of Casing (TOC) data into ESdat (Note the reference point from which groundwater wells are often gauged is the upper collar of the well casing, referred to as Top of Casing) Exercise 2 Calculation of relative water levels allowing for changes in the reference point elevation Copyright @EarthScience Information Systems P a g e 3
Exercises Exercise One: Importing and viewing Subsidence and Time-variant Data ESdat stores time variant data in the Wells_Datevariant_TOC table. Importing data Open ESdat and the Sample Hydrogeology and Contam database Select Import from the View Type tool bar (the top tool bar, as shown in the figure below) Click on the Timevariant TOC button (as shown in the figure below) to automatically create and open a Groundwater Levels Import Template (will open in Excel) Copy or type following data (below) to the Import Template: Location Code Survey date TOC Elevation BH05 5-Mar-10 33.84 33.79 BH05 20-Jun-10 33.27 33.20 BH05 21-Sep-10 32.14 31.10 The Import Template should appear as the figure below (note - in the Well column): Copyright @EarthScience Information Systems P a g e 4
Go to the Add Ins tab at the top of the page and click on this to open the Custom Toolbar (as shown in the figure below will vary by MS Excel version) Click the Upload button to upload data into ESdat The Upload Data Import Options window will open. From the Parent Tables drop down list, select Create Missing Parent Records (as shown below Click the Import button (rows in the Excel sheet will become green indicating successful importation of the data) Close the Upload Data dialogue box and the Excel out saving) Viewing Time-variant Data Return to Data Views (from the View Type tool bar) Hover the cursor over the Data Tables button at the top right of the ESdat screen. A drop down list will appear (as shown in the figure below) Open Wells_Datevariant_TOC table and view the data (which should appear in the Data Panel, similar to the figure below) Copyright @EarthScience Information Systems P a g e 5
Click on the Graph button from the vertical toolbar at the right of the screen (as shown below) A dialogue box entitled Graph data in Excel will open to select various graphing options. Select TOC and elevation for the y-axis and LocCode for the x-axis (as shown in the figure below) Click on Plot to create a graph of the Time series data in Excel (as shown in the figure below) Close Excel Copyright @EarthScience Information Systems P a g e 6
Exercise Two: Water Level Correction with Time Variant Data ESdat is able to calculate water levels relative to a varying reference elevation (such as top of casing, TOC). For example, if a well casing is subsiding (such as at a mine site), ESdat can interpolate corrected water levels. If a well TOC is surveyed on two separate dates and a water level is gauged between these dates, ESdat uses liner interpolation to estimate the corrected water level. Time series data and corrected water level data are stored in separate tables within ESdat. The following exercise will recreate the water level correction calculation. The data used in this exercise is consistent with that used in Tutorial 3.4 Importing and Analysing Water Levels. If Tutorial 3.4 has been completed during this session (i.e. on the same day) the data (shown below) will already exist within ESdat and the next steps can be skipped (see overleaf). Location Code Date/Time Water Elevation Units Water Depth Product Depth Measurement Method BH01A 1/03/2010 m 6.05 6.02 dip BH01A 2/03/2010 m 5.05 5.03 dip BH01A 3/03/2010 m 6.08 6.04 dip BH01B 4/03/2010 m 8.03 8.0 dip BH05 5/03/2010 m 9.2 8.17 dip BH05 6/03/2010 m 8.08 8.06 dip BH05 7/03/2010 m 7.15 7.05 dip BH05 8/03/2010 m 6.25 6.05 dip BH07 9/03/2010 m 7.07 dip BH07 10/03/2010 m 8.06 dip BH07 11/03/2010 m 6.05 dip BH10 8/12/2009 26.55 m dip BH10 1/01/2010 26.54 m dip BH10 5/02/2010 26.52 m dip BH11 28/04/2010 24.14 m dip BH11 8/05/2010 24.12 m dip BH11 8/12/2009 26.7 m dip BH12 1/01/2010 25.88 m dip BH12 5/02/2010 26.61 m dip BH12 12/03/2010 26.65 m dip BH12 28/04/2010 26.66 m dip BH12 8/05/2010 26.61 m dip The process for importing the required data is as follows: Select Import from the View Type tool bar (the top tool bar, as shown in the figure below) Copyright @EarthScience Information Systems P a g e 7
Click Water/NAPL Levels from the Blank Import Templates. A groundwater data import template will open in Excel. Copy data from the table of the previous page into the Import Table, as per the figure below: Click the Upload button From the Upload Data select Add New and Create Missing Parent Records options prior to clicking Import to upload data into ESdat. Data that has successfully been imported will be highlighted green. Close the Excel spreadsheet without saving Skip to this point if the data from Tutorial 3.4 is already present in ESdat. Return to ESdat and navigate to Water Levels Data Type Button Select WL1_Waterlevel_AHD table and view the data in Data Panel Double click on a cell containing Location Code BH05 and a cell containing Well Code - to create the following filter: LocCode = 'BH05' AND WellCode = '-' Click on Apply Filter the following data will be visible in the Data Panel Copyright @EarthScience Information Systems P a g e 8
Transcribe the water level from 08 Mar 2010 to column C in the exercise table below (create the equivalent in Excel) Exercise Table A B C D E F G Location Code Date Water Level BH05 Time series corrected WL Water Depth Standard TOC (C+E) Time Variant TOC (D+E) Select table WL1_Waterlevel_AHD_Using_Timeseries_TOC from the Water Levels Data Types the following data will be visible in the Data Panel Transcribe the water level (Water_Level column) for 08 Mar 2010 into column C in the exercise table Select table WL2_Water_Depths from the Water Levels Data Type Transcribe the water depth (Water_Depth_bTOC column) for 08 Mar 2010 into column E in the exercise table Calculate columns F & G in the exercise table Column F is the (back) calculated standard TOC elevation. Column G is the (back) calculated varying TOC elevation, taking into account the varying TOC. It is important to note that there is difference in the two values. Navigate to BH2_Wells table under Boreholes/Wells Data Type Note the TOC value for BH05 is 33.79 which is equal to the calculated value in column F of the exercise table. Water levels relative to TOC in table WL1_Waterlevel_AHD calculated from the standard (or original) TOC elevation survey measurement in BH2_Wells table. Under Data Tables (the button at top right of the ESdat screen), navigate to Wells_Datevariant_TOC table. Note multiple TOC elevation values exist for BH05 the values represent individual dates when the TOC was surveyed The water level measurement of 8 Mar 2010 occurred between the survey dates of 05 Mar 2010 and 20 Jun 2010 (as seen in the figure above). ESdat uses linear interpolation (i.e. drawing a line between the two points) to calculate an estimated TOC elevation on the date of the water level measurement (8 Mar 2013). Copyright @EarthScience Information Systems P a g e 9
This exercise can be repeated for water levels measured on 6 & 7 Mar 2010 again note the difference in values calculated columns F & G. There will not be a difference in values for water level measured on 5 Mar 2010 as this corresponds to a survey date. Copyright @EarthScience Information Systems P a g e 10