Further, the renewal rate of the geometric freshwater area is calculated as the volume of freshwater that is introduced into the geometric freshwater area in 24 hours compared to its total volume, as seen below:

Renewal
⁢

rate

[

day

-
1

]

=

Volume
⁢

of
⁢

water
⁢

introduced
⁢

to
⁢

the
⁢

geometric
⁢

area

[

m
3

*

day

-
1

]

Total
⁢

volume
⁢

of
⁢

the
⁢

geometric
⁢

area

[

m
3

]

The renewal rate is measured as the number of hours that it takes to renew the total volume of water contained in the geometric freshwater area, and it depends on the amount of freshwater that is introduced to the geometric freshwater area. The renewal rate is related to freshwater that is introduced to such geometric freshwater area, where such freshwater is required to comply with specific parameters as previously defined.

The method of the present application requires a renewal rate of the geometric freshwater area to be at least 3.5 times per 24 hours, which means that the volume of freshwater introduced into the geometric freshwater area in a day (24 hours) is at least 3.5 times the total volume of the freshwater area.

The use of any renewal rate within the defined range is a definition performed by the owner, operator, administrator, coordination means, or any person with the capacity of modifying the renewal rate of such geometric freshwater area.

Now, given the minimum renewal rate defined for the geometric freshwater area, and since the volume and shape of the geometric freshwater area has been defined, the type of inlet elements that are to be used in the system and their corresponding directional vectors (DVs) are defined.

The inlet elements can comprise different types of nozzles including skimmers, floor inlets, wall inlets, gutter systems, over-the-wall inlets, jet inlets, circular inlets, injectors, valves, pipes, and similar elements that allow introducing freshwater into the geometric freshwater area, and that may have different flow ranges and may be of different materials depending on the specific parameters of the water body and geometric freshwater area. The inlet elements have a water flow of within 0.3-36 m³/h each, which is defined based on the geometric freshwater area volume and surface, regulations, and/or safety measures, among others.

The location of the inlet elements will be defined based on the directional vectors (DVs) and the configuration of the geometric freshwater area, where the inlet elements are placed using directional vectors to achieve reaching all parts of the geometric freshwater area water volume and achieve the renewal rates of the geometric freshwater area.

The directional vectors (DVs) define the direction and flow of a water volume that is introduced to the geometric freshwater area are defined based on the type of inlet element that is used for the introduction of such water flow, the water flow ranges allowed for such inlet element, and maximum reach conditions of such inlet element.

The directional vectors that result from the inlet elements can comprise single vectors (for example, for targeted jet nozzles or similar nozzles) or multi-vectors (for example, for circular inlets or inlets with multi-directional flows), and the degree of coverage will depend on the type of inlet element and its location within the freshwater area (in sloped areas, vertical areas, flat areas, or other locations). As examples, there are inlet elements with a predominantly straight angle, while there are inlet elements that can provide a water flow in a 360° angle.

The inlet elements shall be well defined in terms of their allowed flow ranges and reach capacity, in order to ensure that the final placement and configuration of the inlet elements will allow treating all of the water volume contained within the geometric area, and that it will allow achieving the minimum water quality parameters desired for such area.

The inlet elements allow introducing freshwater into the geometric freshwater area, where the freshwater is required to comply with the following water quality parameters in order to achieve a sanitary quality suitable for direct contact recreational purposes:

- pH: 7.0-8.3
- Fecal coliforms: Absence
- Total coliforms: Less than 5 MPN/100 ml
- Floating oils and greases: Less than 5 mg/L
- Turbidity: Less than 5 NTU
- Iron: Less than 1 ppm
- Manganese: Less than 1 ppm
- True color at pH 7.71 Less than 20 Pt—Co
- Copper Less than 2.0 ppm
- Nitrates Less than 50 ppm
- Zinc Less than 3 ppm

The freshwater that is introduced to a geometric freshwater area is required to comply with the above water quality parameters, as the freshwater that is introduced allows to renew the volume of water within such geometric freshwater area, and therefore such parameters are required to be controlled and have been defined to solve the technical problem.

It's important to note that the present disclosure refers to the use of water renewal to achieve sanitary water quality suitable for direct contact recreational purposes in geometric freshwater areas within larger water bodies, whereas previous disclosures discuss the use of chemicals, such as disinfectants, applied locally to some areas to raise the oxidation reduction potential, not related to the renewal of water. The present disclosure uses directional vectors, specific water quality for inlet water, renewal rates, and others to achieve its objective of allowing the use of large water bodies for direct contact purposes, such as swimming, in a safe and sanitary suitable manner, requiring less equipment and achieving lower costs than, for example, using conventional swimming pool filtration construction and operation technologies. The addition of freshwater with the inlet elements and their corresponding directional vectors must have a flow and direction so that the difference in temperature, measured in ° C., within any 50-cm depth difference is less than or equal to 30% as an average measure performed in three separate locations within the geometric freshwater area. However, this may not be required when such geometric freshwater area includes the use of partial or fully confined barriers with the intention of achieving higher temperatures in such area compared to the bulk water volume temperature.

For example, as seen in FIG. 4, a top view of a geometric area (2) is shown, which is located in one end of a water body (1) and that comprises six inlet elements, shown as IE_n, and each inlet element comprises a directional vector shown as DV_n, which are placed to achieve reaching all parts of the geometric area water volume where a dispersion rate is defined in order to allow a high renewal rate of the volume within the geometric area.

Once the inlet elements and their directional vectors have been defined, the method of the present application is required to comply with a Homogeneity Index related to the geometric freshwater area. As previously described, the configuration of the inlet elements and their corresponding directional vectors should be sufficient to achieve the minimum renewal rate of the geometric freshwater area, where such inlets and directional vectors are configured to achieve a Homogeneity Index as defined below.

The Homogeneity Index is related to the potential stratification or dead areas of the volume of water contained within the geometric freshwater area and its mixing conditions to show that the water inside the geometric freshwater area is new water introduced as freshwater and there is no significant permanence of water inside such area. Stratification also refers to the presence of different conditions associated with specific physicochemical parameters within the same water volume, which usually change throughout the y-axis, meaning that different values may be found at different depths. Stratification may occur with different parameters of the water, such as turbidity, salinity, temperature, among others.

In order to measure the homogeneity of a water volume, a suitable test is the use of markers or trackers that can be introduced into the geometric freshwater area and visualize/track how such markers move and eventually leave the geometric freshwater area. Types of markers and/or trackers used include the use of dyes, colorants, solutions or substances that have a residual concentration to be measured empirically, physical elements, radioactive isotopes, among others.

The Homogeneity Index is defined as follows: Homogeneity Index (HI)=1 if the difference in the tracker concentration within any 50-cm depth difference is less than or equal to 20% as an average measure performed in three separate locations within the geometric freshwater area. Otherwise, the HI is 0.

The method of the present invention requires the HI to be 1 to achieve suitable renewal of the geometric freshwater area, as well as achieving suitable direct contact recreational parameters in such area.

As used herein, the tracker concentration refers to the concentration or value of the tracker used to evaluate the homogeneity of the geometric freshwater area, which can include, for example, colorant concentration, radioactive isotope measures, visual inspection, assigning a value or category to the concentration of the tracker, among others.

According to one embodiment, the method for generating at least one geometric freshwater sanitary area within man-made large recreational water bodies, the water bodies having a surface of at least 4,000 m²and a volume of at least 5,000 m³, includes determining at least one geometric freshwater area wherein a coordinated reference system (CRS) is able to map such geometric freshwater sanitary area, and determining an initial reference point (IRP) in the geometric freshwater area from which the coordinates defining the perimeter of the water body and the coordinates of the geometric freshwater area are established; determining the renewal rate of the geometric freshwater area, wherein the renewal rate of the geometric freshwater area is calculated as the volume of freshwater that is introduced into the geometric freshwater area in 24 hours compared to its total volume, and the renewal rate is at least 3.5 times per day, based on the following formula:

Renewal
⁢

rate
⁢

(

Geometric
⁢

freshwater
⁢

area

)

[

day

-
1

]

=

Volume
⁢

of
⁢

freshwater
⁢

introduced

to
⁢

the
⁢

geometric
⁢

freshwater
⁢

area

[

m
3

]

*

[

day

-
1

]

Total
⁢

volume
⁢

of
⁢

geometric
⁢

freshwater
⁢

area

[

m
3

]

- achieving a Comparative Water Renewal Index (CWRI) for bodies of water that include filtration, wherein the CWRI is calculated as the water renewal rate of a geometric freshwater area divided by the water filtration rate of the main volume of the bulk water area and is required to be at least 2.5, based on the following formula:

CWRI
=

Renewal
⁢

Rate
⁢

of
⁢

Geometric
⁢

Freshwater
⁢

Area

[

day

-
1

]

Water
⁢

filtration
⁢

rate
⁢

of
⁢

bulk
⁢