HomeMy WebLinkAboutTHE TOY SHED LOTS 1 AND 2 OF BLOCK 4 OF REPLAT NO 1 OF EVERGREEN PARK PDP - 50 91D - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTFINAL DRAINAGE AND EROSION CONTROL REPORT
FOR
LOTS 1 & 2, BLOCK 49 EVERGREEN PARK
PREPARED FOR
JERRY RUSSELL
OCTOBER 3091998
. PREPARED BY
STEWART & ASSOCIATES, INC.
103 SOUTH MELDRUM STREET
P.O. BOX 429
FORT COLLINS, COLORADO 80522
TEL. 970-482-9331
FAX. 970-482-9382
I TEWART SOCIATE
S &�S S
Consulting Engineers and Surveyors
October 30, 1998
Mr. Basil Hamdan
' Storm Water Utility
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522-0580
Dear Basil,
Lots 1 and 2. Block 4, Evergreen Park are for proposed outside storage parking. There will
be no buildings constructed on these lots. The proposed site will be covered with recycled
asphalt. This development is in the City's Greenbriar/Evergreen Basin. This project is an addition
to the "Toy Shed" which is now located on Lots 3, 4 and 5.
All design and calculations within this report are in compliance with the City of Fort Collins
Storm Drainage Design Criteria and Construction Standards.
If you have any questions or comments regarding this report, please let me know.
Sincerely,
I
Franklin D.
I
meh
James H. Stewart
and Associates, Inc.
103 S. Meldrum Street
P.O. Box 429
Ft. Collins, CO 80522
970/482-9331
Fax 970/482-9382
FINAL DRAINAGE AND EROSION CONTROL REPORT
FOR LOTS 1 AND 29 BLOCK 49 EVERGREEN PARK
INTRODUCTION:
Lots 1 and 2. Block 4, Evergreen Park, Fort Collins, Colorado net area is 1.3838 acres. The
gross area to the centerline of the streets is 1.7394 acres more or less.
The site is bordered on the North by Red Cedar Circle which is constructed; on the East by
undeveloped lots 15 and 16, Block 4; on the South by the "Toy Shed" which is a
Vehicular/Recreational Storage area; and on the West by Red Cedar Circle which is developed.
EXISTING SITE:
This site is located in the City's Greenbriar/Evergreen Basin. All runoff is to Dry Creek.
This site slopes West to East at 0.75%. All runoff is to the streets. The site is covered in
weeds. There is no offsite runoff onto this site.
DRAINAGE CRITERIA:
The Rational Method has been utilized to determine peak runoff rates and required detention
pond volumes. Design factors used are in accordance with the recommendations of the City of
Fort Collins Drainage Criteria and Construction Standards Manual. In accordance with the City
of Fort Collins drainage policy, the 100 year runoff from the developed site will be detained in the
two existing detention ponds and released at the 2 year undeveloped rate.
DEVELOPED SITE:
This site is proposed to be additional.outside storage for the existing "Toy Shed" which is
inside and outside recreational vehicular storage now on Lots 3, 4, and 5 of said Block 4. The
site will be covered with recycled asphalt.
The site -will be graded to two detention ponds. One in the Southwest comer and one in the
Northeast comer of the site. These ponds are sized to detain the 100-year storm and ielease at —
the two year historic rate. Outlet from the ponds will be to the street through a 4" P.V.C. pipe.
The invert of the pipes are set 3" above the bottom of the ponds. This will develop retention in
the bottom 3" of the ponds for water quality control. Also using recycled asphalt over the site in
place of asphalt which will allow infiltration and also help water quality control.
EROSION CONTROL:
This site is located in the moderate zone for both wind and rainfall erodibility.
The construction on this site should only be about one week. A silt fence shall be installed
along the East property line and remain in place until the construction is complete.
The erosion control escrow for this site is $1000.00.