HomeMy WebLinkAboutDrainage Reports - 02/27/2006Final Approved Report
®ate ADDENDUM TO THE ®?-06
STORM DRAINAGE AND EROSION CONTROL REPORT
FOR
NEW ADDITION TO 1500 RIVERSIDE DRIVE
CITY OF FORT COLLINS SPRING CREEK BASIN
PREPARED FOR
MIKE DELLENBACH
February 8, 2006
PREPARED BY
STEWART & ASSOCIATES, INC.
P.O. BOX 429
103 SOUTH MELDRUM STREET
FORT COLLINS, COLORADO 80522
TEL: 970.482.9331
FAX: 970.482.9382
STEWARTMSSOCIATES
Consulting Engineers and Surveyors
' February 9, 2006
' Mr. Basil Hamdan
Storm Water Utility
City of Fort Collins
' Po Box 580
Fort Collins, CO 80522-0580
' Re: 1500 Riverside Drive
.1
Dear Basil,
When the construction of the outlet to our designed pond began the contractor, Sinnett
Builders, noticed that the contours on the railroad site were different than shown on our
plans. It looked to me and to Steve, the project manager, that some left over dirt had
been smoothed out from the construction to the West and that the elevations of the
ground were about 12 inches higher now.
Therefore we raised the outlet pipe and bottom of the pond to match the railroad. The
"As Built" outlet is now at elevation 39.9. I recalculated the pond's new 100-year high
water line and found that the elevation only changed by 0.01 hundredth of a foot.
Therefore we left the pond as designed except for the bottom and outlet elevation. The
spillway was set at the pond 100-year high water line of 41.13 feet. Also a 4-inch
diameter pipe was used in place of the 8-inch pipe. By using the 4-inch pipe, which
matched the original size opening, we eliminated the need for the restriction plat. A
revised grading plan is included herein.
If you have any questions or need information, please let me know.
' Sincerely,
Franklin D,
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
DETENTION POND HIGH WATER LINE
feb 8,. 2006
NOTES: 1. FOR THE FIRST CONTOUR VOLUME A CONIC SHAPE WAS ASSUMED
VOL. = 1/3 (AREA ABOVE) (DIFFERENCE IN COUNTOUR ELEV.)
2. FOR THE REMAIMDER OF THE VOLUMES BETWEEN CONTOURS (SECTION 9.2)
VOL. = DEPTH/3 (A +(AB) — .5 + B) FOR: Uniform Sides sec.(9.2)
3. HWL= (VOL.REQ. —VOL.LOW CUML)*3/(AREA LOW+AREA HIGH +(low area*high area) — .5)
4t.14 HWL POND
VERTICAL RESTRICTION PLATE RETAINING WALL
not to scale
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D. Storm Drainage Notes
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I DETENTION SUMMERY TABLE DETENTION POND DATA
CONTOUR AREAS! VOLUM£cI TOTAL REQUIRED DETENTION - JJ85 c/I
39.9 .;5 EXTENDED DETENTION - 680 of
REOUIRED DETENTION - 2705 cl
41 405 2288.1 T� OF EWOCSERATE - ELEVARONO-740.23
- 01 100 YEAR HWL - 41,13
42 I4,435 WATER QUALITY FOND ELEVATION 40.2J
BASIN DATA (WEST SIDE ONLY)
L BASIN AREA - 0.5J,(oc + DEVELOPED C2-10 - 0.74
HISTORIC C2-10 - 0.47 DEVELOPED 02 — 0.91 c/s
HISTORIC 02 — 0.73 c(s DEVELOPED Oro — 1.55 cls
HISTORIC 010 - 1.24 c(s DEVELOPED 0700 - 4.91 c(s
HISTORIC 0100 - J.61 c(s
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_ City of Fort Cains. Cobrodo
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RIVERSIDE AVENUE CHECKED BY n.'�
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CHECKED BY.' A/�
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CHECI(ED BY:
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