When Designing Storm Sewers and Open Channel Conveyance Systems, the Use

When designing storm sewers and open channel conveyance systems, the use of peak runoff rates is generally considered adequate. However, conveyance system designs that include flood routing components, such as retention or detention basins, which of the following is appropriate to consider?

A) Rainfall spatial variability
B) Flood hydrograph
C) Antecedent soil conditions
D) All of the above

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