Rainfall for this area week-by-week:
18-May 0.72
25-May 0.01
1-Jun 0.4
8-Jun 1.71
15-Jun 1.38
22-Jun 1.60
29-Jun 1.06
6-Jul 2.28
13-Jul 2.52
20-Jul 0.40
27-Jul 0.76
3-Aug 0.51
10-Aug 0.30
17-Aug 8.53
24-Aug 3.49
31-Aug 0.00
7-Sep 0.69
14-Sep 0.96
21-Sep 0.98
28-Sep 0.02
5-Oct 4.09
12-Oct 0.00
19-Oct 0.71
26-Oct 0.01
2-Nov 0.03
9-Nov 0.05
16-Nov 0.00
23-Nov 0.02
30-Nov 0.79
7-Dec 0.58
14-Dec 0.02
Don't know how well that particular area drains, but it seems plausible that is could have had standing water when KC dumped the body, then got even more rain. May have been pretty wet when the August tip was called in. Will be interesting to know what the tip was, if it was anything other than "I think this is the spot."
Waiting for server to free up, I saw crime scene photos on local6 and the place looks very overgrown / dense and is still wet, but no standing water.