River Height History - Last 30 readings

Date & Time Height
2019-03-20 04:30:00 1.057
2019-03-20 04:15:00 1.059
2019-03-20 04:00:00 1.059
2019-03-20 03:45:00 1.059
2019-03-20 03:30:00 1.061
2019-03-20 03:15:00 1.061
2019-03-20 03:00:00 1.061
2019-03-20 02:45:00 1.062
2019-03-20 02:30:00 1.063
2019-03-20 02:15:00 1.064
2019-03-20 02:00:00 1.064
2019-03-20 01:45:00 1.064
2019-03-20 01:30:00 1.065
2019-03-20 01:15:00 1.065
2019-03-20 01:00:00 1.065
2019-03-20 00:45:00 1.065
2019-03-20 00:30:00 1.067
2019-03-20 00:15:00 1.067
2019-03-20 00:00:00 1.068
2019-03-19 23:45:00 1.068
2019-03-19 23:30:00 1.068
2019-03-19 23:15:00 1.070
2019-03-19 23:00:00 1.070
2019-03-19 22:45:00 1.071
2019-03-19 22:30:00 1.072
2019-03-19 22:15:00 1.072
2019-03-19 22:00:00 1.073
2019-03-19 21:45:00 1.073
2019-03-19 21:30:00 1.073
2019-03-19 21:15:00 1.075

If you want to change the amount of entries returned then change the limit value on the url
If you want to search by dates then use a url like this:-
http://www.little-barn-cottage.co.uk/river/API_raw.php?stationReference=1990TH&from=2017-01-01&to=2017-01-10