HomeMy WebLinkAboutPEREZ MINOR SUBDIVISION - 39 92 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTDRAINAGE REPORT
PEREZ MINOR SUBDIVISION
JUNE 17, 1992
STEWART & ASSOCIATES. INC.
103 SOUTH MELDRUM
FORT COLLINS CO 80521
303/482-9331
DRAINAGE REPORT
1802 NORTH COLLEGE AVENUE
The data developed in this report has established a position for a
variance in this "right by use" improvement. Currently, the .38—acre site
is being used as restaurant space with accompanying parking. There are
primarily two small basins within the site (.28 acres west, .10 acres east).
The east basin will in no way be affected by this minor expansion. The west
basin will see the total impact of this 196 square feet being modified from
earth, currently, to an impervious surface. The remaining area of this
addition is merely replacing concrete and asphalt with roofing materials.
Currently, the west basin has an historical runoff of 1.5 c.f.s. from
a (10—year) minor storm. The major 100—year storm produces 2.0 c.f.s. When
the runoff coefficient remains constant of .95, total runoff potential is
unaffected by the 196 square foot impervious addition. The fact is that
this 196 square feet will yield an empirically insignificant .03 c.f.s. when
looked at individually for a 100—year event.
This circumstance for storm drainage control will not result in any
change to the current non —problematic area. Consequently, a variance is
an insightful alternative for this simple structural addition. Should any
questions arise during your review, please do not hesitate in contacting
me.
Richard A. Rutherford, P.E. & L.S.
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IDATE:(2'9.51 DATE: