FLOOD09430

• County: Larimer
• Community: Fort Collins
• Stream Name: Dry Creek
• Basin: South Platte
• Title: Hydraulic Roughness Value Analysis - Manning's n - Dry Creek
• Date: 8/1/1979
• Prepared For: Larimer County
• Prepared By: Gingery Associates, Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

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REACH IV - SCRAP METAL YARD TO AIRPARK DRIVE

In the first part of this reach, the channel is straight and
weed covered, while the left overbank is the same but with inter- ,
mi ttent piles of. scrap metal. Refer to Picture 6. The right over- 1;)0\\ u^'';
, r ',\
bank is weed covered in the area immediately around the channel,. {J'
and contains a local roadway. The far right side is a warehouse
area (see picture 7). The "n" values chosen are .06, .035, .035
and .08 for the left overbank, channel, right overbank and far
right overbank, respectively.
In the next part of the reach, the channel goes through very
thick brush which is mostly on the left overbank (see pictures 8
and 9). The channel has a few more obstacles, such as footbridges
and concrete piles. The "n" values should be similar for,the far
left overbank and far right overbank to those in the last section
of this reach area, as .06 and .08 respectively. The channel
roughness was estimated as .04, the left bank 0.1, and the right
bank area as .04.

, --,--------,-------- --------,

Picture 6 - Left overbank and channel just
upstream of the scrap metal yard
looking downstream. Left overbank
n=.06; channel n=.035.

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