While the theory of first flush is straightforward, first flush may not be observed for one or more of the following reasons: 1  The drainage characteristics of the catchment may prevent it. 2  The pollutants may not be very mobile. 3  Pollutant sources that are effectively continuous may exist within the catchment.
Jenna Dewan Tatum to Host and Mentor for Jennifer Lopez's NBC Show World of Dance. Looks like Jenna Dewan Tatum has nabbed a new gig for the new year â sheâll serve as the host of Jennifer Lopezâs NBC show World of Dance. The 36-year-old actress and dancer joins judges Derek Hough, NE-YO and Lopez on the 10-episode series, which features dancers competing for a $1 million grand prize, according to Deadline Hollywood.
Dave Garroway (1952 to 1961) Dave Garroway was the original host of  The Today Show in 1952. The New York native was a page at NBC, working his way up through a series of positions at television and radio stations across the country. He became known as the Roving Announcer, always able to find a story.