## 4 Application of Indicators in the Study Area  
Three groups of variables were considered for applying the indicators, encompassing demographic, hydrological, and urban aspects. Table 1 presents the demographic data included in the study area analysis, accounting for three types of land use: residential, commercial, and services.  
\begin{table}
\begin{tabular}{l r} \hline \hline
**Description** & **Quantity** \\ \hline Number of dwellings & 18,993 \\ Average persons per dwelling & 3.6 \\ Population by dwellings & 68,374.8 \\ \hline Number of commercial areas & 1081.2 \\ Average number of people per commercial area & 4 \\ Population by commercial area & 4325.1 \\ \hline Number of services & 41 \\ Average persons by services & 268 \\ Population by services areas & 29,274 \\ \hline \hline \end{tabular}
\end{table}
Table 1: Demographic data of the study zone.  
Based on the area's physical environment analysis, relevant hydrological information was determined, specifically the absorption and runoff coefficients for the different soil types. Runoff coefficients were used according to [29] based on land uses (Table 2). Using these coefficients from governmental agencies, we applied their complements to determine the absorption coefficients for our indicators.  
Regarding urban aspects, spaces were categorized according to land use. Residential, commercial, and service uses were identified and classified based on the number of users, specific water consumption needs, and the actual water supply they receive. Table 3 shows the classification and surface of land use in the study area depicted in Figure 1.  
Table 4 presents the total rooftop area by building type, the number of dwelling units for each type, and the average rooftop area allocated to each unit according to building type. These areas were mapped based on the executive project of the selected residential area (private communication).  
The local operating authority specifies the required water volume for domestic use, while the volume for commercial and service use is established by [29]. The supply volume for domestic and commercial use is rationed every third day, whereas the service volume is provided daily. Table 5 indicates the water volume required per person based on land use and the actual volume of water supplied.  
\begin{table}
\begin{tabular}{l l l l} \hline \hline
**Building Type** & **Total Area (m2)** & \
\begin{tabular}{l} **Number of** \\ **Dwellings** \\ \end{tabular} &
\begin{tabular}{l} **Average Rooftop Area** \\ **per Dwelling (m2)** \\ \end{tabular} \\ \hline Single family & 335,355.7 & 8098 & 41.4 \\ Duplex & 91,974.5 & 1581 & 58.2 \\ Triplex & 1078.8 & 33 & 32.7 \\ Quadruplex & 86,659.8 & 4036 & 21.5 \\ Multifamily building 15 & 5861.5 & 585 & 10 \\ Multifamily building 20 & 29,522.8 & 3220 & 9.2 \\ Multifamily building 30 & 15,783.1 & 1440 & 10.9 \\ Commercial & 81,095.2 & 1081 & 75 \\ Services & 47,313.8 & 41 & 1154 \\ \hline \hline \end{tabular}
\end{table}
Table 4: Dwellings by building type and their areas.  
\begin{table}
\begin{tabular}{l r r} \hline \hline
**Soil Type** & **Absorption Coefficient** & **Runoff Coefficient** \\ \hline Green areas & 0.87 & 0.13 \\ Bare soil & 0.57 & 0.43 \\ Sidewalks and roads & 0.05 & 0.95 \\ Rooftops & 0.235 & 0.765 \\ \hline \hline \end{tabular}
\end{table}
Table 2: Absorption and runoff coefficients by soil type [29].  
\begin{table}
\begin{tabular}{l r} \hline \hline
**Soil Type** & **Area (m2)** \\ \hline Green areas & 261,800.2 \\ Roads and sidewalks & 1,229,891.4 \\ Bare areas (wastelands and parks) & 816,285.6 \\ Rooftops & 694,645.1 \\ \hline Total area under study & 3,002,622.3 \\ \hline \hline \end{tabular}
\end{table}
Table 3: Land use classification and its areas.