Over-exploitation caused a steady decline in irrigation due to " droughts, sedimentation, aggradation of the main channel, salinization, seepage and waterlogging ".
22.
The occupation of the hill that dominates this narrowing of the valley developed through a gradual spread across the lowlands by building embankments and the aggradation from flood soil.
23.
The bottom paleosol was aggraded in 550 years, for an average rate of about per year ( though the aggradation occurs only during short-lived events ).
24.
When the river encountered flatter ground, it deposited its sediment load resulting in the creation of broad, flat floodplains, alluvial fans, and meander bends through aggradation.
25.
The extent of cultivation began to decline after this due to water shortage, floods and waterlogging caused by aggradation of the riverbed, a rising water table and poor drainage.
26.
It is thus by sub-glacial aggradation that the prairies have been levelled up to a smooth surface, in contrast to the higher and non-glaciated hilly country just to the south.
27.
In 2009, a report by researchers from the University of Colorado at Boulder in the journal Nature Geoscience said that reduced aggradation was contributing to an increased risk of flooding in many river deltas.
28.
The sudden increase of sediment supply caused bed aggradation of ~ 1 meter, resulting in a change of channel morphology from pool-riffle to braided, and decreased the slope of the lowermost river.
29.
A study has found that the delta is at a greater risk as the rate of sediment aggradation ( raising the level of the delta through sediment deposition ) no longer exceeds relative sea-level rise.
30.
In the beginning of the 18th century, there was a decline in the Ribeira shipyard activities, due to the aggradation of the Portuguese coast and the Povoan shipyard started to work in the construction of fishing vessels.
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