A really large inner tube! Seriously, I'd be very hesitant to partially block that drain. It would strain the surrounding soils holding it in place.
How are you going to know unless you try!
NW TX 2ac main pond fed from 1100ac watershed going through 2 2+ac sediment ponds. 1st filled 10/2018
900BG, 200RES, 200HBG, 100CC and 23# FHM...."Free" BH, GSF GSH, LMB & ??? 75LMB 3/2020
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