simple detail view of flood station and readings

lib/model/reading.dart

@@ -0,0 +1,11 @@
+class Reading {
+  final DateTime dateTime;
+  final double value;
+
+  factory Reading.fromMap(Map<String, dynamic> json) => Reading(
+        dateTime: DateTime.parse(json['dateTime']),
+        value: json['value'],
+      );
+
+  Reading({required this.dateTime, required this.value});
+}