Update natural-flow.ipynb

Adjusted the text a little, otherwise the different averages from different datasets may cause confusion by users.

docs/tutorial/natural-flow.ipynb

@@ -48,7 +48,7 @@
    "source": [
     "# Crystal River Basin\n",
     "We will examine a straightforward example of the Crystal river basin, which includes a main river and a single tributary flowing into the sea (see @fig-crystal-basin).\n",
-    "An average discharge of $44.45 \\text{ m}^3/\\text{s}$ is measured at the confluence.\n",
+    "Between 2014 and 2023 the average discharge of $44.45 \\text{ m}^3/\\text{s}$ is measured at the confluence.\n",
     "In this module, the basin is free of any activities, allowing the model to simulate the natural flow.\n",
     "The next step is to include a demand (irrigation) that taps from a canal out of the main river.\n",
     "\n",
@@ -89,7 +89,9 @@
    "metadata": {},
    "source": [
     "### Setup paths and model configuration\n",
-    "Reference the paths of the Ribasim installation and model directory and define the time period (2022-01-01 until 2023-01-01) for the model simulation.\n",
+    "Reference the paths of the Ribasim installation and model directory and define the time period. \n"
+    "The used simulation period is defined by the `starttime` and `endtime` of the model, not by the input timeseries. \n"
+    "For now we will look into the years from 2022-01-01 until 2023-01-01 for the model simulation.\n",
     "The coordinate reference system (CRS) is also required, and set to [EPSG:4326](https://epsg.io/4326), which means all coordinates are interpreted as latitude and longitude values.\n",
     "The CRS is important for correctly placing Ribasim models on the map, but since this is a fictional model, it is not important."
    ]
@@ -117,8 +119,8 @@
    "source": [
     "### FlowBoundary nodes\n",
     "The Crystal basin consists of two inflow points, the tributary and the main Crystal river, we will call them Minor and Main respectively.\n",
-    "This is a monthly inflow timeseries from 2014 to 2023.\n",
-    "The used simulation period is defined by the `starttime` and `endtime` of the model, not by the input timeseries."
+    "The .csv file provided in the .zip folder contains the monthly inflow timeseries from 2014 to 2023.\n",
+    "You could read the .csv directly as a dataframe or add the flows between 2022 and 2023 manually as follows: "
    ]
   },
   {
@@ -135,8 +137,8 @@
     "data[\"total\"] = data[\"minor\"] + data[\"main\"]\n",
     "display(data)\n",
     "\n",
-    "# Average and max inflow of the total inflow data timeseries\n",
-    "# From 2014 - 2023\n",
+    "# Average and max inflow of the total inflow data implemented\n",
+    "# From 2022 - 2023\n",
     "print(\"Average inflow [m3/s]:\", data[\"total\"].mean())\n",
     "print(\"Maximum inflow [m3/s]:\", data[\"total\"].max())\n",
     "\n",