Which risk increased within Sumerian canals if the flow velocity decreased below a critical threshold during irrigation?

💡 Explanation

When flow velocity decreases, sediment transport capacity also drops because the suspended particles settle due to gravity, leading to silt deposition which reduces the canal's flow capacity. Therefore, silt deposition is the risk, rather than salinity, collapse, or blooms which stem from different mechanisms such as evaporation, pressure imbalances, or nutrient overload.

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