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16 April 1990 Hydrologic Engineering Branch Larry Lang, P.E. Chief, Flood Control and Flood Plain Management Section Colorado Water Conservation Board 1313 Sherman Street. Denver, Colorado 80203 Dear Mr. Lang: Mark Matulik of your staff and Mark Nelson from the Corps met with Mr. David Wood and oi:her officials of the town of Wiggins on March 21, 1990. A presentation of t:he Corps low cost flood warning system was given. The town ()fficials are very interested in having an automated flood warning system in- stalled. They are concerned about the fact that Burlington Northern must respond to a closure request from Denver and that a crew might not arrive in t:ime. 'rhey :feel that automatic flood detection is required in order to provide maximum warning time. They also indicated that they would like your assistance in determining if t:he Burlingt.on Northern Railroad would sponsor the monthly phone bills from the gages, since the railroad also has an interest: in closing the track during a flood. Following a site visit t:o the K.iowa Creek Basin, the Corps would like to modify the Plan-of-Work. It is envisioned that the flood warning system would consist of 2 flood detection gages, which would transmit a message when the channel is about 1/4 bankfull and another when the stream is about to overflow at each site. One gage would be located at the Highway 52 bridge and another about 3 miles upsi:ream from the town. The function of the upper gage ",rould be to detect large floods moving down from the 80 percent of the basin above the highway. The purpose of the downstream gage would be to detect floods from storms cent'~red below Hiqhway 52,r improve the accuracy of flood forecasts so that the flood closure structures are only operated when needed and to provide back-up.