From simple to complex, from public to private and from rural to urban, A&O provides hydraulic design services for stream crossings, roadway projects, and land development projects. Impacts to the 100-yr floodplain can result from site development, roadway crossings, greenway trails, or dam impoundments, which is why A&O specializes in FEMA regulated floodplains. Hydraulic designs are used to assist in determining proposed bridge lengths and elevations of bridge decks with an ultimate goal to reduce or eliminate potential flooding of property. A&O is experienced in performing flood studies for FEMA-regulated waterways and floodplains, including preparations for Conditional Letters of Map Revision (CLOMRs), for bridge and culvert crossings across North Carolina.
Specialized hydraulic analysis is also needed for flood inundation from a dam breach. In the process of developing an Emergency Action Plan, a detailed hydrologic and hydraulic analysis is performed to determine the extent of inundation resulting from a dam breach. The inundation map is then incorporated into the county or municipal’s GIS system for notification of residents in danger of a potential disaster.