*3.1.6 Results of inventory's contamination source in the study area*

The results and spatial distribution maps of village and inventory's contamination source in the study area are shown in **Figures 12** and **13**.

The sampling sites are illustrated in **Figure 14**.

**3.2 Results analysis of fluoride's concentration in groundwater of the**

*GIS and Statistical Evaluation of Fluoride Content in Southern Part of Upper Rasyan Aquifer…*

A summarized statistic descriptive of results of fluoride's concentration (mg/L) in groundwater of the study area is shown in **Table 1**, and the minimum, maximum, means and standard deviation of results based on each sub-basin are illustrated in

We used boxplot tool in order to provide a simplified presentation of how the values of fluoride's concentration are distributed, the boxplot (**Figure 15**) illustrated, the values' distributions are dissimilarities in their distribution in three

**Variable Min Q1 Median Q3 Max Mean StDev** F- mg/L 0.100 1.470 1.890 2.980 6.000 2.353 1.449

No. of wells 56 29 8 Minimum 0.98 0.1 0.58 Maximum 5.81 5.45 1.11 Mean 2.32 2.66 0.85 S.D 1.15 1.26 0.189

*Descriptive statistics of fluoride values mg/L in groundwater samples of the study area by sub-basin.*

**Al-Hawban, sub-basin Al-Burayhi and Hedran, sub-basin Al-Dhabab, sub-basin**

**study area**

**Table 2**.

**Figure 14.** *Sampling sites.*

sub-basins.

**Table 1.**

*SD, standard deviation.*

**Table 2.**

**133**

*3.2.1 Descriptive statistic of results*

*DOI: http://dx.doi.org/10.5772/intechopen.91329*

*Descriptive statistics of F- mg/L for all samples.*

**Figure 12.** *Spatial distribution of pollution sources in the study area.*

**Figure 13.** *Village's distribution in the study area.*

*GIS and Statistical Evaluation of Fluoride Content in Southern Part of Upper Rasyan Aquifer… DOI: http://dx.doi.org/10.5772/intechopen.91329*

**Figure 14.** *Sampling sites.*

*3.1.5.2 Groundwater flow*

*Resources of Water*

**Figure 12.**

**Figure 13.**

**132**

*Village's distribution in the study area.*

According to [19], in general, the groundwater movement in the study area is a function of the hydrological system into the north-west corner of the study area (toward the Al-Burayhi and Hedran sub-basin). In the volcanic aquifers, the direc-

The results and spatial distribution maps of village and inventory's contamina-

tion of the groundwater movement is subject to the direction of the faults.

*3.1.6 Results of inventory's contamination source in the study area*

tion source in the study area are shown in **Figures 12** and **13**.

The sampling sites are illustrated in **Figure 14**.

*Spatial distribution of pollution sources in the study area.*
