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Groundwater Modelling Application for Waterworks

Tapesh Ajmera (TKAJ),Hydrogeologist Specialist

COWI India Pvt Ltd/COWI Denmarkhttp://www.cowiportal.com/Pages/home.aspx

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Outline

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› COWI Services

› Overview of project

› Case study: Farup

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COWI Services-Hydrogeology

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Groundwater modelling

Groundwater control system design

Site Investigation and characterization

Pumping / Slug Test

Multi-phase and multi-component numerical modelling in porous and fracture-

porous media

Surface and subsurface flow and solute transport modelling

Soil and groundwater remediation of contaminated sites

Rainfall-runoff modelling, and stage-discharge modelling

Statistical for hydrology and environmental data analysis

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Groundwater Modelling for Waterworks

Kortlægning uden for OSD – Midtjylland, Denmark

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Study Area: Waterworks area

Farup

Helgenaes

OvergaardGods

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Primary objective of project

› Develop a site-specific groundwater model based hydrogeological and hydrological inputs.

› Calibrate of groundwater model using PEST.

› Determine capture zone for each waterworks.

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Step for Model development

Collection of hydrological and hydrogeological

input

Prepared input file for model

Develop conceptual model

Model calibration based head observed, recharge, and

abstraction wells

Model for prediction (optimal hydraulic

conductivity) Import Qpermit as guidelines

Results: head distribution and capture zone of

waterworks

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Case Study: Farup

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Study Area: Farup

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Model Features› Model domain area: 122.17 km²

› Grid size: 100*100 m2

› Three-dimensional groundwater flow model developed in MODFLOW (GMS version 9.2).

› Model geology has been construct based regional Denmark groundwater model.

› Model consist of five hydro-stratigraphic layers and eight computational layers with specified hydraulic conductivity and porosity.

› Top and bottom elevation of each layer has been implemented based on field observed data.

› Total five pumping wells has implemented with specified well information. However, capture zone analysis has executed for one waterworks, which include only two abstraction wells such as well no. 58.367 and 58.399.

› The fixed head along the entire boundary in the limestone based on the filed observed data and no-flow boundaries in the other layers have implemented.

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Hydraulic Parameters for Groundwater Model

Layer Name Layer description Hydraulic conductivity (m/s)

Porosity (%)

Sand1(S1) Quaternary Sand 2 1e-5 30

Clay1(C1) Quaternary Clay separating QS2 and QS3

1e-7 25

Sand2(S2) Local Sand on top of QS4 1e-5 30

Clay(C2) Pre-quaternary clay 1e-8 25

Limestone (LS) Water-bearing part of the limestone

2e-4 20

Note: Vertical anisotropy ratio equal to 10 for all geological layer

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No. Well I.D X Y Z DVR90 Flow rate

(m³/d)

Top of ScreenDVR90

Bottom of

ScreenDVR90

1 58.367 552628 6266998 39.25 -284.93 -26.75 -31.75

2 58.399 552738 6267234 45.97 -284.93 -21.04 -38.04

3 58.279 553861 6266721 14.9 -460.27 14.7 -54.11

4 58.387 557555 6267519 51.61 -832.88 15.0 -26.43

5 58.403 561435 6270884 49.96 -191.78 -1.5 -30.0

Pumping Wells Information

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Recharge and Ground Topography variable recharge rate over the top surface

recharge rate varies from 221 mm/y to 430 mm/y

ground topography as DEM

Note: unit: m/d

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Geology

A A'

B'

B

Section A-A'

Section B-B'

Z magnification = 50

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PEST: Calibration

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Simulated Head

Layer-1 Layer-2

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Simulated Head

Layer-3 Layer-4

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Simulated Head

Layer-5 Layer-6

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Simulated Head

Layer-7 Layer-8

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Capture Zone

› Model: MODPATH

› One waterworks (2 wells)

› backwards tracking of particles

› no. of particle:10*10*10

› Within cell

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Team

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Hydrogeologist/Groundwater modeller SpecialistGroundwater and Geoscience Department,COWI India/COWI DenmarkEmail:tkaj@cowi.dk Ph.:+91-8826074442

Hydrogeologist/Groundwater modeller SpecialistGroundwater and Geoscience Department,COWI DenmarkEmail:snkn@cowi.dk

Project Director & HOSGroundwater and Geoscience Department,COWI DenmarkEmail:kemr@cowi.dk

Project Director,Groundwater and Geoscience Department,COWI DenmarkEmail:anre@cowi.dk

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Thank you for your attention!

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