Finding Max Value in Duplicates

Hi - I have data that has about 10 duplicate values (UTC Time) in one column and another column with number values (depth ft) that vary. I need to obtain the maximum (highest) value in the depth column and remove the other duplicates to filter out the low values. So for the data example below for UTC 15:56:28 I only want the 5.7 row, for 15:56:29 I want5.3 row and so on. I can attach the sheet if that helps, any help appreciated - this is a huuge dataset so manual filtering wont work. Data is from a sonar that gives 10 depth readings per second - I only need one depth tat is the highest value. Thanks

ID UTC Depth (FT)
1 15:56:28 4.3
2 15:56:28 4.4
3 15:56:28 5
4 15:56:28 5.4
5 15:56:28 5.7
6 15:56:28 5.5
7 15:56:28 5.6
8 15:56:28 5.6
9 15:56:28 5.5
10 15:56:28 5.4
11 15:56:28 5.3
12 15:56:28 5.3
13 15:56:28 5.3
14 15:56:29 5.2
15 15:56:29 5.3
16 15:56:29 5
17 15:56:29 4.9
18 15:56:29 5.1
19 15:56:29 5.1
20 15:56:29 5.2
21 15:56:29 5.2
22 15:56:29 5.1
23 15:56:29 5.1