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Started By
Message
re: Planned freshwater diversions will doom LA salt fishing
Posted on 3/27/13 at 10:46 am to 34venture
Posted on 3/27/13 at 10:46 am to 34venture
quote:
You obviously don't know how much dredging cost.
Couple that with the fact that it washes away almost as quick as it is dredged since there isn't any new material coming down to reinforce it.
Posted on 3/27/13 at 10:48 am to bayoudude
Exactly. We need to stop trying to change a whole coastline. Let nature do what we undid
Posted on 3/27/13 at 10:57 am to bayoudude
Also there are huge differences between a sediment diversion and a freshwater diversion in the design.
Everything that has been designed previously is a water diversion first and the design did not really incorporate sediment transport into it.
The new ones will be designed as sediment diversions so expect to see something that looks like Morganza flood way or bonnet carre spillway. Something wider and flatter instead of a large box culvert.
They also don't need to be operating at full capacity (in theory) all the time. The sediment load of the river peaks prior to the flood water peak. If designed and operated properly the sediment can be captured while the peak flood flow can be sent down the river to wash out the mouth of the river (SW pass).
That concept would hopefully allow the state to get a permit from the corps which previously required the state pay for increased dredging of shipping channels due to water flow changes from diversions. The increased dredging cost requirements has killed many water/channel re-alignment and proposed diversion projects in the past.
Everything that has been designed previously is a water diversion first and the design did not really incorporate sediment transport into it.
The new ones will be designed as sediment diversions so expect to see something that looks like Morganza flood way or bonnet carre spillway. Something wider and flatter instead of a large box culvert.
They also don't need to be operating at full capacity (in theory) all the time. The sediment load of the river peaks prior to the flood water peak. If designed and operated properly the sediment can be captured while the peak flood flow can be sent down the river to wash out the mouth of the river (SW pass).
That concept would hopefully allow the state to get a permit from the corps which previously required the state pay for increased dredging of shipping channels due to water flow changes from diversions. The increased dredging cost requirements has killed many water/channel re-alignment and proposed diversion projects in the past.
Posted on 3/27/13 at 1:31 pm to bayoudude
quote:
quote:You obviously don't know how much dredging cost. Couple that with the fact that it washes away almost as quick as it is dredged since there isn't any new material coming down to reinforce it.
This is not necessarily true. I have seen dredged areas south of venice that are still there even 20 years later. This land has sunk some but it is still mostly there.
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