Nyknba

I just finished building a large stream in my backyard. It's about 85 feet long and 3 feet wide. I have a Hayward Power Flo Matrix SP-1592 1HP pump but the problem is the water is hardly flowing at all. It comes out hard at the top waterfall but not enough pressure to push the water down the river. I am thinking I need a more powerful pump to push the water faster. is there a pump you can recommend for my situation? I’ll take any ideas!