I had a lid but nowadays if i had to build a dam i would just build it on top of the hose ,so the waterpressure will prime the hose with no capping needed. If i work without a dam because the natural river features provide enough drop,i lay out the hose with as few dips as possible,so the hose fills with water as much as possible. Then i lift the hose where remaining air sits and walk downriver lifting the hose.The air bubble will follow you ,while the inlet of hose upstream is under water and sucks in water. I escort the air to the outlet so to speak. Backbreaking. If you have plenty of drop,the hose will prime itself(avoid dips)
Wow awesome look like your moving a lot of material with that big hose. How did you prime it? Are you capping the bottom and filling from the nozzle?
I had a lid but nowadays if i had to build a dam i would just build it on top of the hose ,so the waterpressure will prime the hose with no capping needed.
If i work without a dam because the natural river features provide enough drop,i lay out the hose with as few dips as possible,so the hose fills with water as much as possible.
Then i lift the hose where remaining air sits and walk downriver lifting the hose.The air bubble will follow you ,while the inlet of hose upstream is under water and sucks in water.
I escort the air to the outlet so to speak.
Backbreaking.
If you have plenty of drop,the hose will prime itself(avoid dips)