Thanks for the comments all.
The pipe will be surface laying with concrete blocks
as the weight.
The tide-flex would be on the air release discharge (adapted) from the air release valve. This is just a thought, to see if anyone has ever done something similar.
Thanks Stephen, good for a chuckle this morning.
Yes, growth is a problem and I thought there might be a solution such as a screen or by using a tide-flex valve.
I am designing a 150mm HDPE sewer forcemain crossing of a marine harbour (1,500m)
There is an unfortunate hump of about 2.5m high that creates a high spot in the profile. This is without expensive trenching.
Are there suitable air release valves on the market that will operate in this...