*2.1. Presenting the Catenoy Site*

The Catenoy (Oise) experimental site is located about 50 km north of Paris in the Paris sedimentary basin (Figure 1). The coordinates of the center of the site are as follows: latitude 49◦22005" N, longitude 2 ◦30026" E, altitude ~60 m asl. The geology corresponds to a few meters of Quaternary deposits (colluviums, loess) and Tertiary formations, lying over a hundred meters of Senonian chalk that is only visible in the thalwegs (see also Figure 2b). Under the site, the underground geology of the first 25 m is 3 m of colluvium, 4 m of Thanetian sands, and 18 m of chalk. At a few hundred meters on the south of the site, Ypresian and Lutetian layers form a hill. There are no major tectonic accidents nearby and the bedding of the chalk formation is horizontal. This chalk encloses an aquifer with a static level at a depth of 13 m which flows in the WSW-ENE direction [4].

Located in a former agricultural field that has been fallow for more than a decade, the site is equipped with 8 piezometers aligned in the direction of flow of the aquifer over a distance of 80 m, referenced PZ1 to PZ6 (including supplementary piezometers PZ2BIS and PZ2TER), plus a technical shed housing the monitoring material (Figure 2). The piezometers are about 25 m depth and are screened in the aquifer starting from 13 m depth.

The hydrodynamic characteristics of the chalk aquifer at the site were determined during a pumping test carried out in 2013 [4]. Depending on the piezometer considered, the following values were reported:


In addition, a previous tracing test made it possible to estimate the flow rate of the aquifer at 3 m·d <sup>−</sup><sup>1</sup> at PZ3 and PZ5, and 10 m·<sup>d</sup> <sup>−</sup><sup>1</sup> at PZ4, the latter being situated in a preferential flow path (fissured area). This test, therefore, demonstrates the double porosity of the aquifer studied.

There is also a meteorological station on-site to measure the following parameters at hourly time intervals: atmospheric temperature and pressure, rainfall.

*Appl. Sci.* **2020**, *10*, x FOR PEER REVIEW 4 of 18

*Appl. Sci.* x FOR PEER REVIEW 4 of 18

**Figure 1.** Location and geological context of the experimental site. **Figure 1.** Location and geological context of the experimental site. **Figure 1.** Location and geological experimental site.

**Figure 2.** Diagram of the Catenoy experimental site: (**a**) planimetry; (**b**) cross-section. **Figure 2.** of the site: ( Diagram of the Catenoy experimental site: ( **ab**) ) planimetry; (**b**) cross-section.
