HomeMy WebLinkAboutLINDIMER SUBDIVISION FINAL - 26 93A - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTSTEWART&ASSOCIATES
Consulting Engineers and Surveyors
June 7, 1993
Ms. Kate Mahler
Storm Water Utility
City of Fort Collins
P.O. Box 580
Fort Collins, Colorado 80522
Dear Kate:
The following is the erosion control cost estimate for Lindimer
Subdivision:
Cost Option I:
1• Straw Bales - 2 @ $100.00 $200.00
2. Gravel Filters - 2 @ $100.00 $200.00
Cost Option II:
1. Reseeding — 153.767 S.F. @ $0.0149 $2291.00
The City's requirement of 150% of $2291.00 = $3437.00
If you have any questions regarding this matter, please call.
Sincerely,
.�` �N
Richard A. Rutherford, P.E. & L.S. c-'���?����sTERF!.,0
President
. a.
• 5028
jrr
'a,�s�•A F $ `• 5 � o ,,mac
OF'
James H. Stewart
and Associates, Inc.
103 S. Meldrum Street
P.O. Box 429
Ft. Collins, CO 80522
303/482-9331
Fax 303/482-9382
c
� sEctioN
1
FRAMING-: PER CONTR.
FURNISHED PLANS
COMPACTED BACKFILL
PER SOILS REPORT
8' CONIC. FDN. W/
2-04 BARS T45 CONT.
(GRADE 6m)
UNTREATED BLDG PAPER. OVER 12'
CLEAN 3/4" GRAVEL OVER 4' DIA.
PERF. DRAIN TILE SET 4' BELOW
FOOTING: AS REQ'D AT TIME OF
OPEN HOLE INSPECTION
3112" AJUST COLUMN
E PER
1/2' ISOLATION JT
(11 MN AT COLUMS ONLY)
04 BARS * 12' OC EW
•� Tom- 4' CONC. FLOOR SLAB OVER
4' CLEAN GRAVEL
2 SEctioN
1
WIND EROSION CONTROL
Soil Roughing
Perimeter Barrier
Additional Barriers
Vegetative Methods
Soil Sealant
Other
RAINFALL EROSION CONTROL
STRUCTURAL:
Sediment Trap/Basin
Inlet Filters
Straw Barriers
Silt Fence Barriers
Sand Bags
Bare Soil Preparation
Contour Furrows
Terracing
Asphalt/Concrete Paving
Other
VEGETATIVE:
Permanent Seed Planting
Mulching/Sealant
Temporary Seed Planting
Sod Installation
Nettings/Mats/Blankets
Other
i
---------------------------- ---------------------------------
STRUCTURES: INSTALLED BY
MAINTAINED BY
VEGETATION/MULCHING CONTRACTOR
DATE SUBMITTED APPROVED BY CITY OF FORT COLLINS ON
HDI/SF-C:1989
CU,.oTRUCTION SEQUENCE
PROJECT:. 1,1AIVI MEP. .fu8�iviriewJ STANDARD FORM C
sEQUENCE. FOR 19 93 ONLY COMPLETED BY: A;C DATE: G f
Indicate by use of a bar line or -symbols when erosion control measures will be installed.
Major modifications to an approved schedule may require submitting a. new schedule for
approval by the City Engineer.
YEAR
1
MONTH J I F I MIA I M 1 J I J A s O AJ p
----------------------------I------------------------------ -'---- ---- -----
--
OVERLOT GRADING I I
I
i
i
CI Z :
EFFECTIVENESS CALCULATIONS
7 ----------------------------------
------------------
PROJECT: L/ND/MEIe .Sv6Drvi.r7o.v STANUARU FORM B
CONPLETEU BY: _�,�}� UATE: /,¢
Erosion Control
Method
C-Factor
Value
P-Factor
Value Comment
S.A Q s Geo v N D----,--�-
L 7- CONG,
-
/.'o o---- ---i, 7.0 --------------------
O. Q 1 .
/.00
SE1) M E,UT B AliV
/ 0-V
O. Sd
STZ' A W a A I E :•C'e,gvEGfiuGe '/ 0-v O. eO
--------------------------
MAJOR
PS.
SUB
AREA
BASIIi
(;)
BASIN
(Ac)
CALCULATIONS
--` -
-784%
„A `
Z 4/4
--- gAe G,eovuD 0 97A c.
Ex�1T Gzgrf: / 44 Ac,
wTD P O. SO' _
E FF. = I-Co.411A 0.4 Alv
BARB OVA
_t�, _ 0,5
En;,r GeArJ O.s
wTD C, = 0.s4x/;po) t �c
WTI = O. yo X
EFF 01993Xoo-o) x/c
TOTAL. CFF; _ (0.83c{ X Z
70, 1
c O.OZ)
-0.41 S
Q. 9-O
.7 83,4%,
AC•
Ac•
•TB x O. Oz�
_ -. - 0-493
U - a 0. 3 `�0
4 r� (0, 903X i ;LJ
• .S3
o ,E
c�)
RAINFALL PERFORMANCE STANDARD EVALUATION
------------------------------------------ --------------------------
PROJECT: L/ND/ME,e .l�ga../✓rf/o.v STANDARD FORM A
COMPLETED BY: �,�� DATE: G
------------------------------ — ---------- —------ ------------ /9---- —
IDEVELOPED ERODIBILITYI
SUBBASIN ZONE
----- -------
'A /6H ..
..B. Hr& H
Asb
(ac)
-------
2.4/Aa
/•ILA&.
Lsb
(ft) '
-----;-
68o
Z70
Ssb
(%) .
-------
O• c%
j
7
Lb
(feet)
-------
Sb
M
-------I
PS
( )
I
3.0 4c.
i
�
i
SSD
I • / � %
I
%8 4%
-------------------------------------- ______________________________
DI/SF-A:1939
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Consulting Engineers and Surveyors
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Lindimer Subdivision
Page 2
Construction activities or homes should not create adverse hazards to
the irrigation ditch. The Pleasant Valley and Lake Canal is presently bordered
by numerous subdivisions as it traverses the City of Fort Collins. The
developer and builder will be.responsible for keeping construction materials
out of the ditch. The.quality of storm water runoff from existing developments
entering the ditch.has not been an issue in the past. In the large storms,
the ponds will fill up and the turf in the rear yards will be able to filter
out some oils. In the minor storm or for nuisance flows, the filtering will
not happen since the flow will remain in the concrete pan. The City of Fort
Collins has not required treatment of storm water from residential developments.
This development is on the high side of the ditch so there should not
be seepage onto these lots. Seepage will only occur on the east, or low side,
where the headgates are located. There was no ground water encountered in
the soils report although the investigation was done before the irrigation
season. All of the ditch access is on the east side of the ditch.
The only offsite flows that enter the site are from the rear yards of
four lots in Rossborough, Third Filing,which are adjacent to Lots 11 through
15. That offsite flow will .continue to sheet flow .across Lots 11 through 15.
There are drainage easements between these lots. The runoff from the stable
property to the south drains east to the ditch and doesn't enter this site.
A small bearm will be placed along the rear line of Lots 4, 5 and 6 to
prohibit the rear yard runoff from discharging into the canal undetained.
The site has a moderate wind erodibility and a high rainfall erodibility.
The existing ground cover is very good pasture grass. Due to the flat condition
of the site, there will be no overlot grading and, therefore, only the street
area will be disturbed. The two detention basins will be constructed prior
to the beginning of any earthwork. Rock filters will be placed on the discharge
pipes to create sedimentation basins.
The runoff calculations, the detention pond mass diagram and the grading
and drainage plan are included as a part of this report. If you have any
questions regarding this site or this report, please call.
Sincerely, I
6
Richard A. Rutherford, P.E. & L.S.
President
j r r
enclosures
STEWART&ASSOCIATES
Consulting Engineers and Surveyors
June 7, 1993
Ms. Kate Mahler
Storm Water Utility
City of Fort Collins
P.O. Box 580
Fort Collins,
Dear Kate:
Colorado 80522
The following is the preliminary drainage report for Lindimer Subdivision
which is located on Birmingham Drive in the Southeast a of Section 27, Township
7 North, Range 69 West of the 6th P.M. The site contains 4.30 acres and is
at the very south end of the Spring Creek Basin. It is bounded on the west
by the existing Rossborough Subdivison, on the northeast by the Pleasant Valley
and Lake Canal and on the south by an existing horse stable. The site slopes
gently from southwest to northeast to the Pleasant Valley and Lake Canal.
Since the historic drainage has discharged into the Canal, the runoff actually
flows into the Foothills Drainage Basin, via the Canal, rather than into Spring
Creek. .
Mr. Willis Smith of the Pleasant Valley and Lake Canal Company will sign
Sheets 1 and 5 of the.Utility Plans giving approval to continue to discharge
into the Canal at the historic runoff rate.
It is proposed to detain the difference between the 100—year developed
flows and the two—year historic flows. The present site is an existing grass
pasture. The proposed use is for a fifteen lot single—family detached
residential subdivision.
The allowable discharge rate is 0.87 cubic feet per second. The developed
2—year, 10—year and 100—year flows are 2.95, 5.19 and 11.83 cubic feet per
second respectively. The required detention volume is 17,886 cubic feet.
It is proposed to carry the runoff to two proposed detention ponds on
the surface in the Birmingham Drive gutter and two concrete pans. The site
was divided into two sub —basins, "A" and "B", which each have a detention pond.
The ponds are located in drainage easements in the rear of rather deep lots.
They will be maintained by the property owners of the lot on which they are
located. The ponds will discharge into the Pleasant Valley and Lake Canal
through a pipe laid through an earthen berm. Side yard fences will not be
allowed in the detention ponds. The owners will be allowed to fence the front
and the rear of the detention ponds with a 4.0 foot high open —type fence such
as a chain link or picket that allows water to flow through or under.
James H. Stewart
and Associates, Inc.
103 S. Meldrum Street
P.O. Box 429
Ft.Collins, CO 80522
303/482-9331
Fax 303/482-9382
FINAL DRAINAGE REPORT
FOR
LINDIMER SUBDIVISION
JUNE 7, 1993
STEWART & ASSOCIATES. INC.
103 SOUTH MELDRUM STREET
FORT COLLINS, COLORADO 80521
303/482-9331