Groundwater Levels

Considering the strong groundwater dependent nature of the area, the groundwater levels in Torbali-Bayindir plain is monitored by State Hydraulic Works on a monthly basis since 1960s. Considering the large time period between two consecutive data, the information from these wells could best be used in assessing the long-term general trend in groundwater levels in the plain. An example of such change in a well is presented in Fig. 25.4. In this study, the long-term data from 21 such wells are analyzed and statistical summary of the results are presented in Table 25.1. As seen from the table, all wells but one represents a declining pattern which is mostly associated with increased extraction from the aquifers. Overall, the data from these 21 boreholes has an average declining rate of 0.75 m/year with an average R2 value of 0.54. The declining rate reach to levels of 1.3 m/year with a R2 value of about 0.9 in some wells.

While the average groundwater level in the plain is calculated to be 23.4 m, minimum level recorded is found to be 64.3 m in a well near Bayindir. A more specific result is the seasonal decline and increase in a well as a function of the

Date

12/6/1976 11/10/1981 10/15/1986 9/19/1991 8/23/1996 7/28/2001 7/2/2006 0 i-1-1-1-1-1-1-

Date

12/6/1976 11/10/1981 10/15/1986 9/19/1991 8/23/1996 7/28/2001 7/2/2006 0 i-1-1-1-1-1-1-

Fig. 25.4 Change in groundwater levels in a monitoring well in Torbali-Bayindir plain

Fig. 25.4 Change in groundwater levels in a monitoring well in Torbali-Bayindir plain

Table 25.1 Statistics for groundwater level data

Min GW

Maximum Average

Decline/

Decline/

District

Well name

X

Y

Date range

level

GW level

GW level

day (m)

year (m)

R2

Bayindir

Yakacik

561,493

4,227,277

06/1983-05/2010

-46.70

-1.19

-26.60

-0.0035

-1.2775

0.8935

Bayindir

Haskoy

545,486

4,221,940

06/1978-05/2010

-54.65

-0.12

-13.51

-0.003

-1.0950

0.6780

Bayindir

Arikbasi

544,074

4,226,112

01/1977-05/2010

-41.20

-7.00

-23.87

-0.0025

-0.9125

0.8797

Bayindir

Kizilcaova

546,429

4,227,472

01/1985-04/2003

-33.90

-10.35

-21.99

-0.0029

-1.0585

0.7419

Bayindir

Kizilcaova

05/1975-05/2010

-49.50

-14.53

-36.65

-0.0023

-0.8395

0.8011

(19141)

Bayindir

Yusuflu

559,856

4,229,224

01/1985-05/2010

-64.30

-13.37

-43.37

-0.0033

-1.2045

0.8700

Bayindir

Flrlnll

551,058

4,226,751

01/1985-05/2010

-53.15

-0.60

-17.339

-0.0025

-0.9125

0.6257

Bayindir

Flrlnll

551029

4,226,400

01/1985-05/2010

-34.70

-0.25

-13.58

-0.0029

-1.0585

0.5165

Bayindir

Zeytinova

563,444

4,227,368

01/1991-05/2010

-55.40

-24.15

-42.07

-0.0022

-0.8030

0.5519

Bayindir

Elifli

549,991

4,227,482

01/1991-04/2010

-47.40

-9.75

-28.26

-0.0014

-0.5110

0.1914

Bayindir

Ciplak

548,848

4,223,693

01/1985-06/2004

-24.90

-0.18

-12.13

-0.0023

-0.8695

0.7258

(Canli)

Torbali

Sehitler

535,825

4,222,837

06/1987-04/2010

-34.50

-3.27

-14.60

-0.0017

-0.6205

0.3381

Torbali

Torbali

527,639

4,226,632

03/1985-04/2010

-339.50

-0.25

-16.09

-0.0013

-0.4745

0.2042

Torbali

Torbali

530,918

4,226,340

09/1972-04/2010

-52.45

-6.85

-25.29

-0.0024

-0.8760

0.8318

Torbali

Pancar

521,261

4,228,044

01/1985-04/2010

-10.70

-0.40

-4.19

4.00E-05

0.0146

0.0023

Torbali

Pancar

522,173

4,224,376

01/1992-04/2010

-43.70

-3.70

-24.36

-0.0001

-0.0365

0.0005

Torbali

Pancar

521,125

4,224,308

01/1992-04/2010

-48.10

-3.40

-25.88

-0.0011

-0.4015

0.0538

Torbali

Mandra

532,182

4,227,015

09/1968-04/2010

-61.80

-11.64

-27.89

-0.0016

-0.5840

0.6183

Torbali

Arslanlar

535,684

4,225,108

09/1979-04/2010

-36.80

-3.70

-13.93

-0.002

-0.7300

0.5839

Torbali

Arslanlar

535,936

4,225,606

01/1987-04/2010

-41.50

-9.70

-19.10

-0.0024

-0.8760

0.6395

Torbali

TMYO-1

532,025

4,226,423

04/2007-10/2009

-46.50

-28.83

-40.91

Insufficient

Insufficient

Insufficient

data

data

data

Minimum

-64.30

-28.83

-43.37

-0.00350

-1.27750

0.00050

Maximum

-10.70

-0.12

-4.19

0.00004

0.01460

0.89350

Standard Dev.

12.32

7.95

10.63

0.0010

0.3472

0.3004

Average

-43.85

-7.30

-23.41

-0.00207

-0.75482

0.53740

Fig. 25.5 Relationship between precipitation and groundwater levels

infiltration results (Fig. 25.5). Seasonal decline and recovery could sometimes reach to levels as high as 30 m representing the extremely dynamic pattern of groundwater flow pattern in this alluvial system.

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