When it rains in Lincoln, stormwater flows into drainage inlets, gutters and underground pipes before reaching Salt Creek, which drains into the Platte River. Lincoln occasionally gets more rain than the storm drain system or streams can adequately convey, which can lead to flooding.
When talking about floods the term "flood elevation" is used. This is a way to describe the level of the water surface at any point. When describing any point, such as land surface or water surface, we determine a number of feet above sea level, which is the reference point that everyone has agreed to use. By calculating the water surface, or "flood elevation," and by surveying the land surface to determine the land elevation, we can then predict the depth of water at any point in a flood. A qualified land surveyor can determine the elevation of any point on land, such as your property, and provide you with an elevation certificate.
A floodplain is an area of land that is susceptible to flooding or that has flood prone soils. Approximately 13.8% of Lancaster County is covered by floodplains. Floodplains provide multiple benefits to both the natural (flood storage, habitat, water quality) and built (recreation, public health and safety, economic) environments. The overriding development policy for the floodplain is a "No Adverse Impact" policy for the City and County, which means that the community has a goal of insuring that the action of one property owner does not adversely impact the flooding risk for other properties.