Floodplain

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A relief culvert should be placed at the lowest point of the natural surface to drain the perennial or frequent flows. This prevents water from ponding upstream of the floodway, softening the embankment and subgrade which ultimately causes pavement failure.

FEMA floodway

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Floodway Pasig

In general, there are 5 typical floodway types and their guideline drawings are listed in Table 1. Each of the types varies in some ways from the others and their applications are explained in Main Roads Floodway Design Guide.

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FEMA floodway Map

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Design guidelines for pavement and embankment scour protection for floodways can be found in Main Roads Floodway Design Guide.

Floodway is designed such that it can be trafficable for all flows up to the design AEP and for all flows up to 2% AEP can be contained within the floodway approach without spilling out elsewhere along the road.

Floodway should be on a straight horizontal alignment. When a floodway is on a horizontal curve and overtopped by water, the risks are listed below. Floodway and floodway approaches should not be located in either horizontal curves or plan/superelevation transitions.

The extent of embankment scour protection should be extended beyond the floodway design length to the water level extent as shown in Figure 2. Consideration should be given to minimising the closure time by ensuring the road is not damaged after the design rainfall event. Road damage repair work is always difficult in a remote area and the fund for road repair work may not always be available for road damage caused by frequent events. The recommended desirable Annual Exceedance Probability (AEP) water level for the extent of embankment scour protection is 2%.

Floodway Map

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What is a floodway Zone

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The extent of cement stabilised pavement should be extended to 1% AEP water level or vertical crest VPI, whichever is lower.

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These guidelines aim to ensure that all the design criteria have been considered for designing a floodway specifically from a road geometric design perspective. Guidelines for hydrological and hydraulics analysis and structural and civil engineering design of a floodway can be found in Main Roads Floodway Design Guide.

Floodway vs floodplain

Floodways are commonly used on rural roads with relatively low traffic volume and where it is impractical or uneconomical to construct a bridge or culvert.The road geometric vertical alignment components of a floodway are outlined in Figure 1. The length of the floodway is generally taken to be the length between the intersection points of sag vertical curves, no account being taken of the extra capacity of floodway approaches or loss of capacity due to the sag vertical curves.

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Sag vertical curves should be kept short in order not to encroach on the waterway in the floodway depression and not to increase the raised portion of the ramp more than is strictly necessary. Road embankments on the approaches to floodways are susceptible to scour and their length should be kept as short as possible. The angle of the ramp should therefore be as high as possible and consistent with other geometric requirements. A combination of 40m sag vertical curve with 0.8% longitudinal grade on floodway ramp is typically used, however, it should be noted that this combination will result in a very marginal deficiency in headlight criteria for a design speed of 110km/h with a reaction of 2.5 seconds. In this case, the length of sag vertical curve is expected to be increased slightly in order to meet the standard headlight criteria.