![]() ![]() Consideration should also be given to providing drain basins on the up-grade side of bridges where the roadway has curb and gutter, or the roadway is steeply sloped and/or wide, or it is the critical low side of a superelevated roadway and there is a possibility of a significant volume of water being carried onto the bridge. Some examples of when bridge end drainage provisions are most effective are for down-grade ends on sloped bridges, bridges in sag vertical curves, long and/or wide bridges, inside radius of superelevated and curved bridges, roadways with curbs and gutters leading up to a bridge end. Bridge end drainage are provisions for conveying bridge deck and roadway discharge near the bridge ends away from the bridge without eroding embankment spill slopes and sideslopes. Bridge Division will determine the placement of slab drains.īridge end drainage provisions should be considered on every bridge job. 10 748.7.10 Type 2 Rock Blanket at Grade Crossingsīridges are provided with a combination of slab drains on the bridge and drain basins, if required (see EPG 504 Concrete Approach Pavement), drain flumes or rock blanket off the bridge at the bridge ends to drain the bridge deck.9 748.7.9 Type 2 Rock Blanket at Stream Crossings.8 748.7.8 Sideslope Drainage Provisions.5 748.7.5 Concrete Spill Slope Protection and Concrete Aprons.4 748.7.4 Bridges on a Minor or Low Volume Route.
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