Another function of the floodplain is to act as a natural sponge to absorb, slow down and filter storm water. Trees, shrubs and other natural vegetation along stream corridors buffer the creek by functioning as a protective barrier which soaks up stormwater, stabilizes stream banks, filters pollutants for clean water and protects aquatic life. Previously, Lincoln had a standard that required the preservation of a buffer called a 'Minimum Flood Corridor' along some limited stream reaches, but this standard did not apply to streams with mapped floodplains, nor to some smaller streams.
The standards for New Growth Areas extend the requirement of a 'Minimum Flood Corridor' so that it applies to streams with mapped floodplains. The buffer requirement is also extended to some smaller streams outside the floodplain not previously protected (this part of the standard also applies in the Existing Urban Area). The width of the buffer (including both sides of the creek) is the width of the bottom of the stream, plus 6 times the stream's depth, plus 60 feet. This means that the width of the Minimum Flood Corridor will vary with the size of the stream.
Drainage Criteria Manual: 10.3 Minimum Flood Corridor (373 K)