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NORTHERNENGINEERING.COM | 970.221.4158 Stormwater Variance Attachment
FORT COLLINS | GREELEY 1 | 1
STORMWATER VARIANCE ATTACHMENT
Additional Information for Variance:
· The closest stormwater infrastructure is an inlet located on Prospect, directly southwest of the site. Alternatives
we considered at the beginning of the project included a pipe from the southwest corner of this site, through
multiple private properties, down to the inlet off Prospect. This would have required several easements through
private properties, if allowed. After discussions with the City, neighbors, and the owner, we determined that
releasing to the flowline of Shields Street would be the better option.
· Site is limited by the existing grades and shallow slopes.
· The high point of the entrance has been moved farther east to reduce offsite flows not being detained. The original
100-yr release rate for Basin OS-1 was 0.4 cfs and the proposed 100-yr release rate is 0.2 cfs.