Fish mn, 10 inch outflow pipe for upper pond, and 10inch outflow pipe for secondary lower pond .. The lower pond banks and outflow pipe held and worked fine... WAter came I'n so fast , yes ice rose a little maybe a inch or two, but ice opened up where inflow was entering pond and about 4 ft around outflow pipe because the movement of water so fast... The prob i have now is this, the elevation of seconday pond is about 4 ft lower than upper pond..... But 90 I'n upper pond where it snapped is under water about a foot or two... So i think i will have to drain secondary pond to fix upper pond... My design flaw i guess. Lol... Not much a guy can do I'n -30 windshield temps.. Lol.....
