I think it's normal to see that mud ring and it will probably be there until the exposed surface is covered by grass or the water level rises to the grass. The soil will always absorb some of the water to cause that ring. That's my informal explanation anyway. I'm sure there are more technical terms for all of this. 
2 Acre, Completed July 2022, CC,BG, Sept. 2022, LMB June 2023, GSF, YBH invasion in 2022. BG, CNBG, RES, 2025, TP seasonal.
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