HomeMy WebLinkAboutDrainage Reports - 12/20/20011
1
1
1
1
1
I
Final -vi Report
2=? Ze- 0/a�
FINAL DRAINAGE REPORT
FOR
LOT 8, BLOCK 96, HARRISON'S ADDITION
OLD TOWN MASTER DRAINAGE BASIN
PREPARED FOR
ROCKY MOUNTAIN CONSTRUCTION MANAGEMENT
SEPTEMBER 19, 2001
PREPARED BY
STEWART & ASSOCIATES
103 SOUTH MELDRUM STREET
P.O. BOX 429
FORT COLLINS, CO 80522
TEL. 970-482-9331
FAX. 970-482-9382
TABLE OF CONTENTS
1
'
1
Vicinity map
2-3
Teat of Report
'
4-7
Runoff Calculations
8-9
Detention Mass Diagram and Volume Table
10-12
Extended Detention
12-16
Erosion Control Calculations
17
Restriction Plate
'
18
Spillway Design
Pocket
Grading, Drainage & Erosion Control Plan
[1
11
1
1
1
1
vs�
STEWART&kSSOCIATES
' September 19, 2001 Consulting Engineers arxi Surveyors
'
Mr. Basil Hamdan
Stormwater Utilities
City of Fort Collins
'
P.O. Box 580
Fort Collins, CO 80522-0580
'
Dear Basil,
The following is the final drainage report for Lot 8, Block 96, Harrison's Addition to the City
of Fort Collins, Colorado. The address of the site is 600 and 604 South Meldrum Street. The area
of the site is 19,000 square feet. The site is in the Old Town Master Drainage Basin. The site is
' bounded on the North by West Myrtle Street, on the East by an existing 20 foot alley, on the South
by an existing residence and on the West by South Meldrum Street. The site has an existing frame
house on the West 100.00 feet of the North half of Lot 8 and an existing brick house on the West
' 100.00 feet of the South half of Lot 8. The site is not in a flood plain of the Old Town Basin.
The owner is proposing to construct a four unit residential building on the East 90.60 feet of
' Lot 8. There will be four garages and four parking spaces constructed for the proposed Four-Plex.
The garages and parking spaces are accessed from the existing asphalt alley.
' The front yards of 600 and 604 South Meldrum Street slope West from the houses to the East
curb of South Meldrum Street. The existing rear yards of the two existing houses slope from the rear
of the house to the existing alley. The existing alley slopes from South to North to the South gutter
of West Myrtle Street.
There is an existing curb inlet on the East curb and gutter of Meldrum Street at the
intersection. The South curb and gutter of West Myrtle Street flows East from Meldrum Street to
an existing curb inlet at the Southwest corner of Myrtle Street and Howes Street. The curb inlets
' discharge to the existing storm drain in the center of West Myrtle Street.
The site is divided into two basins for the historic runoff calculations and the developed runoff
' calculations. Basin I is from the front yard of the two existing houses to the East curb of Meldrum
Street. Basin I flows to the curb inlet at the northwest corner of Block 96. The area of Basin I is
0.107 acres. The historic runoff and the developed runoff for Basin I are the same. The two year
runoff rate for Basin I is 0.09 c.f.s.. and the 100 year runoff rate for Basin I is 0.40 c.f.s..
Basin 11 is the balance of the site from the front of the existing two residences to the East side
' of the alley and from the South property line of Lot 8 to the South curb of Myrtle Street. The area
of Basin H is 0.527 acres. The two year historic rate of runoff for Basin II is 0.31 c.f.s. and the 100
year historic rate of runoff for Basin 11 is 1.48 c.f.s. The two year developed rate of runoff for Basin
' 1110.58 c.f.s. and the 100 year developed rate of runoff for Basin II is 2.88 c.f.s..
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
C3)
On -site stormwater detention and extended detention for water quality will be provided for
Basin II in the East parking lot and the landscape area North and West of the proposed four-plex.
EROSION CONTROL:
A sediment trap will be'placed in the detention pond until the water quality structure is
completed. A silt fence will be placed along the property line North of the four-plex.
The stormwater runoff calculations and the detention and extended calculations and the
erosion control calculations are a part of this report.
This drainage report and the design of the drainage system are in compliance with the City
of Fort Collins Storm Drainage Design and Criteria. If you have any questions regarding this report,
please call.
Sincerely,
GZj,.(, ec
Richard A. Rutherford, P.E. & . S. : 5028
RAR/meh
r7
L
1
I�
7
I
I
F
I
STEWART&ASSOCIATES
Consulting Engineers and Surveyors
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
By: P—,AP. Date: )r&6.V4cootClient: Roc&�j Aey.VTA,v r-. Nl. Sheet No. 4--_of_
Project: I_ T_ g R- n k UaA n D 1 r, o
Subject:_. ATl---R. R nFr At- .47-eo,ur
:
H I S T__J. C
f
f �'
'
8 �1
� �
-----
i
I
... j ch...,(D• 9'5:-x 0. (187� +�O. zo x
it
-
:_0.8._l3�_ i 0.._3
4--�
_ I ,
i
Z} ,�_-__� , 3.1----�2,f ¢ o_x.—o,_t_o�=
Q- y
!! i I
I
! 4 0_ �e=1 0.341 X 4_.10 X
i 1
0
_1 _, _O,
1
l
i
1
t, —71M r AJT—
#..... r.
i_ �
_
I
�
�O�G FJ �
U f
I
It-
--}{
1
: 1 I
i �— i I
I
_
(� �i1 -1 =+H-�
I
I
I
I
11
I
I
I
11
I
I
I
7
I
STEWART&JkSSOCIATES
Consulting Engineers and Surveyors
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
By:C D. F can 2 4 Zoo I Client: R o cJQ1
I
Project: L n -r i .1 F3 t. o
Subject: -rn i;e m W A J? U&J or I-- C &,I- I, _U4- A 7'lOkJ-f
F-1 L A's
-7-
I L
i qL5' x 0. Z6 &)-A-4(
F-
0-'av O73
0
17
T
10
AA W - -t-
AiU
f!
I
l
H•
JIM
0 0 V14-,
I I
STEWART&ASSOCIATES 103 S. MELDRUM, FORT COLLINS, CO 80521
' Consulting Engineers and Surveyors PH. 482-9331 FAX 482-9382
By: , A X Date:EOIL.Z oaj Client: V o ck M I, rA i .iJ C. M . Sheet No. of_
' Project: l -0-r fly R -O k q (� NA e f21 c,, xJ'r 'A n D i -rie),)
Subject: A-r _ te, ,R u 1J Ar r,) Tin ,u r
h
,I
I
I
hI
I
1
I
I
T—
Tj.�-
— A "
—
_
_.__
1I ,
f/},IeEA. D,Z-9 DI A'ce61
.. _+-SSlD-j%
ME.2jV0vJ
w •
i
'
TG ,- I�,-S��.G/.l_I—I_U�_�il� �19;0.��Z �-�
.,12.O�Fi ,V,- --=
! 1
x--/-�.I_X
sz�-i .S8 G.Fis_
..
I_ FT
, i
t_.�=I
_Ilz
M,u,
I t
/0 y� = Lzs_ C_o. b_� x.
i
o,S �L:_l z_,_� �_G•.
_
I , ��,-��_x�
I_;_ 1
I !
_ _Z
I I-iI
I
ii i
I
--i -�-'
-- - -
t ► T
} '
�1
STEWART&kSSOCIATES 103 S. MELDRUM, FORT COLLINS, CO 80521
Consulting Engineers and Surveyors PH. 482-9331 FAX 482-9382
By: )2, Date: Egs. Z/,2ooi Client: Rpc.*-;eA4oaAi-rA1A) C.M. Sheet No. 7 of_
Project: D:Z: 91, I3z-oe-*- 11ol. 14 A P-Aj so Air Ar>m, )-r//) ,J
Subject: D F_ A. i Aj AG r-- T-,4 a L
T—
T -7 -F- —7--1
4- -
p— A r. - 0i -.�:-'-TA13Lc
!4
ET
b I
di
i
13,4s.t
TIC-
I
-7,Ar. --b -10
-7-
6JAW.— —0,-pq.r-F-5..
0,
--T
/5'
cr-�.
0. 40
J--
L3tc Fd
+
L
Z'884cs
E:
H1
I
L
L
IT I
I ITI
I
I
I
I
STEWART&ASSOCIATES 103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
' Consulting Engineers and Surveyors
By: R . A. 02, Date: Fg . 21. Zoo1 Client: f2 oGKy Aov cirg/.y C, M, Sheet No. _A of_
' Project: L p 7- 8 B Ld CK RG I. N,a )2p-1 ro.y'r A p n It T/o,y
Subject: J-Tn pe M 110 r4TE,2 b ET .UT/0 &2 A r / A 6 ,eA xi
1
1
1
t00
1
100
1000
i
too
1
i
I_._. _ .._
I
i ,
�. _._.__�— .. _.. ... T_v. .�:.. ..�—..: v�_....
: , I
o I
v.v�.v.p.p .✓c.....__.,..__r_v
:
t—. v.rycyvr __✓ai/�.v.Lr(/A/
'
4' It,-
�.�__
�- 20
3o
_ —_.. .
I
�3.79-
L
7Ji_8:54
...__�___..
_
I
_3�z ..G3.G►iB�
z--
Z3- -- ! - 1'._Z9.�-r-3,
_.D.�
8_7D
1-
. �) 3_D.__�._' !?,9..__.
�/.83_L_ _O,_f
I-�—�—I—
, Z 3.Z ..` 3 OZ4 ,
_.�I
T
_ _
_!—
I
:
_ I
I
i
- -
-.v _o0 9D )Zp
T/ M E (M I V.�
1 STEWART&ASSOCIATES 103 S. MELDRUM, FORT COLLINS, CO 80521
1 Consulting Engineers and Surveyors PH. 482-9331 FAX 482-9382
By: f A- P, Date: FE,s Z4 7, Client: ockx A v ur.4jxi Sheet No. Of
Project: Le)—r Pig -Pt,r7rk q/ -, NAaeE/10,')IS ADpIT/Diu
1
Subject: D i�— -ram AJTI D J P10 A.) I? n c, () M r-- 7�A- 8 [ - e
1
1
i
1
1
1
i
1
1
1
1
1
1
1
1
1
' I I
f
�
__'Po/JDJ_V-OLuMT.AB�E�
—,-
b o
u 7 utLl
1R4_
t
ea, 8._...
� I
D
_—;UcR.eHE.u1
I ,
_�JUMMGR.T�,V.s.
.
-C
9
�4e
EPT_H _
-t
_..
V w�,tie_
fl
_
ocu.nE..
I --
-
i
� I 1
1
,
- -l1-1-1,1
3 / G,-r'
i
i l
i
l - 1 I -
I-
I 1
�,--�'�-{'__
.._
i
r"'�___-'- ,---.;`__ (-_=.' ' i
• --�+� _ x-T.__
-r
-_I_� tZ_�
i�-1..._i_ , �_
36
�f
z9 4,1.-3,�
-!
I
I
I
� I
T '�,��Ifs
I
_
.•I
_
-�- -r ---
-
-
-.--
-
-
' TT-F1
1
[1
1
1
1
1
1
STEWART8,6SSOCIATES 103 S. 9 LD1RUM, FAX FORT gOLLINS, CO 80521
Consulting Engineers and Surveyors
By: E - A, e, Date: _ r- c- R Z4, z *I Client: o c.e v M o u.v rA i.V C, M, Sheet No. 16 of_
Project: L o T A R o C.k 9 (may kl +,e EI rn tir A t> a / -r-le Al
Subject: Lx =r a.0 ni, E: z;> -rl 6Al F a .e W A TE ee Qrl at, rT_
-
.
X •%E rU U.Eb . D r-- TE,v r/o y _
A.)
j.LDS S2-7r-Li,2cS
i
I i
1 ,
-. I
9 X-
I
i
I
�
'
I
II ,
( !!!
E2.1%IpW..IJ�33'
,— _-r
S
I
I I I(
_ P" 0I _-To_9 46_
_
�
I
2
�uo,_
I I l i �._I �_ 1 I
—)-�t
� I
I•
x o:. sZ� 0,_o_09ZaC._Fr_xi1
-�
T3
.�201
��EP-z_N— l_• ZS_T�- -S �i ws_
_
I
GtJ_l-D
E.-X
I
i 1 -IT
4-H--
Zp
J
r
DRAINAGE CRITERIA MANUAL (V. 3)
STORMWATER QUALITY MANAGEMENT
1
1
1
1
9-1-1992
UDFCD
501
JIM
3
60.2
`o 0.:
05
m
a
1
xten
Z-HOL
ed De
r Drat
entior
i time
Basin
(Dry)
I
I
I
I
Detentic
1
-Hour
n Pon
Drain
Js (W
Time
t)
1
u 10 20 30 40 50 60 70 80 90 100
Percent Impervious Area in Tributary Watershed
Source: Urbanos, Guo, Tucker (1989)
Note: Watershed inches of runoff shall a'p1y to the
entire watershed tributary to the Br Facility.
FIGURE 5-1. WATER QUALITY CAPTURE VOLUME (WQCV)
' DRAINAGE CRITERIA MANUAL (V. 3) STRUCTURAL BMPs
'
10.0
'
6.0
4.0
'
2.0
'
1.0
m 0.60
0.40
'
E
m
'
r 0.20
cis
Q
0.10
2
3
'
0.06
0.04
0.02
0.01
0
SOLUTION: Required Areapr
v
®r
FA
1'01,PA
po
PJA
ps
11
'Anil
0
A 0/1 0A
PIN
A FJOA
F
" AN' A
r
VA
V4A
04FAME,
No
No,
rm
01011011
• 0.20 0.40 0.60 1.0 2.0 4.0 6.0
' Required Area per Row rn.2 )
Source: Douglas County Sturm Drainage and Technical Criteria, 1986.
' FIGURE 5-3. WATER QUALITY OUTLET SIZING: DRY EXTENDED DETENTION
BASIN WITH A 40-HOUR DRAIN TIME OF THE CAPTURE VOLUME
9-1-1992
UDFCD
I
L
11
1
r
CONSTRUCTION SEQUENCE �.
PROJECT: o-r I B[.ae,k 96, H,4P-,eiSour 4V0/77/0U STANDARD FORM C
SEQUENCE. FOR tool ONLY COMPLETED BY: )CA DATE: T„�v 9, zoos
�L +
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.
Zool YEAR
----------------------MONTH I T 1 Fr I A,I M � J- I T I A I S I p ,J
-I
T
OVERLOT GRADING
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 c-ouc.R67F rovmrlkrau
LJ'
1
VEGETATIVE:
Permanent Seed Planting
Mulching/Sealant
Temporary Seed Planting
Sod Installation
Nettings/Mats/Blankets
Other
LJ'
1
VEGETATIVE:
Permanent Seed Planting
Mulching/Sealant
Temporary Seed Planting
Sod Installation
Nettings/Mats/Blankets
Other
-------------------------------------;-----------------------------
STRUCTURES: INSTALLED BY MAINTAINED BY
VEGETATION/MULCHING CONTRACTOR
DATE SUBMITTED APPROVED BY CITY OF FORT COLLINS ON
HOI/SF-C:1989
SAN4 AR'f-1991 8-20 DESIGN CRITERIA
0 -)
RAINFALL PERFORMANCE STANDARD EVALUATION
---------------------------------------------�-1-----------------------
PROJECT:
L07 g , Bl
Blot-.- 96,
AIAR
-Is ?
0N1' DO/T/O+JSTANDARO
FORM A
COMPLETED
--------------------=------------------------------------------------
BY: )'Z� A re-
DATE:
(
DEVELOPED(ERODIBILITY(
Asb (
Lsb
( Ssb ( Lb
( Sb (
PS
SUBBASIN
( ZONE
(ft)
( (ro)
((feet)
( (o) (
()
---------
----- ---(-(ac)--(
(-------(
7-o7,4 rr
/`AoDEAA7EI
0-K i
/la
i a•7Y
1 190
1 6.7%I
73.6%V
r
------------
DI/SF-A 1989
EFFECTIVENESS CALCULATIONS
PROJECT: LOT B$�oc/a 9(HA2e�soNS f}aA7-ri0 U STANDARD FORM B
COMPLETED BY: 12.,q . /2 DATE: Fee Za, zm/
Erosion Control C-Factor P-Factor
Method Value Value Comment
13A2EGe0,;AJ•p hoo /.00 0• /8Ac,
CaUCRE-TEF0vuDATio•J D.D7 /,60 0,ZZ Ac '
1� ExurJu& "cvtEJ,
E?Q.ST//v& („egSJ 0•07 hoo 6. V -Ac.
51L-r FE,vcc-
/•D0 0•5D
S I AA EA/ 7- Tc A a 1, 00 0.50
MAJOR
PS
SUB
AREA
BASIN
BASIN
(Ac)
CALCULATIONS
OcD
%3.G%
L-OT
0 "4
-rDWAJ
g
w ram."C" _ Cl.00x 0.19) + (6•07 x o•az) t <o.o� x.ao¢�
__ 0 4-Z
o. 44
D.SO X o. 50 = 6. z S
X 0•LS) ] X /00 = 8 9•5 f
Ok 736%
Ci e)
STEWART&ASSOCIATES
Consulting Engineers and Surveyors
March 1, 2001
Mr. Basil Harridan
Stormwater Utilities
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522-0580
Dear Basil,
The following is the cost estimate for the erosion control measures for Lot 8, Block 96,
Harrison's Addition.
1. Silt Fence, 100 L.F. @ $3 per L.F. $ 300.00
2. Extended Detention Pond $ 600.00
Total Estimate of Items 1 & 2 $ 900.00
3. Reseeding 11,000 S.F. @ $0.03 per S.F. $ 330.00
Escrow for Site = $900 X 1.5 $ 1,350.00
If you have any questions regarding this estimate, please call.
Sincerely,
Richard A. Rutherford, P.E. & L.S.
RAR/meh
James H. Stewart and Associates, Inc.
103 S. Meldrum Street • P.O. Box 429 • Ft. Collins, CO 80522
970/482-9331 9 Fax 970/482-9382
STEWART&ASSOCIATES 103 S. ME482-9331LDRUM, FORT COLLINS, CO 80521
PH. FAX 482-9382
Consulting Engineers and Surveyors
By: ;e, Date: -oi-y G,zoo Client: Rork-X MoyAir4l Ai C. M, Sheet No. 0 of
Project: L o -r P) BLOCK 'I 14A P
t, is o Aj -r AT> r), 1 7-,/ ?,3 , i
Subject: 2 i5s-rr- 1c--r1oxj FL, 4 7r,;:
4--
TT-
4 i
t=
T-
-T—
I 12),
uj.E
Iz
I
-4-
A)/Al. I'
dil
14
—rHEA)—A
A'1-VVm--f1,q1VM
tu_ 17-- R- X-1, 31
5--reld
i
1
1
1
1
1
i
1
1
1
1
1
1
1
1
1
1
0 g)
EMERGENCY SPILLWAY DESIGN
Weir Equation Q = C L (H) ^ 3/2
Q (cfs), C (weir coefficient), L (crest length, feet), H (energy head, feet)
5 = Weir Length L in feet
3.1 = Weir Coefficient
Weir. Shape Broadcrested
Design Flow 2.88 (cfs)
Depth of
flow ft
Flow Over Weir
cfs
0.10
0.49
0.15
0.90
0.20
1.39
0.25
1.94
0.301
2.55
0.32
2.81
0.33
2.94
0.35
3.21
0.40
3.92
0.50
5.48
41010:.0�i�GTS
115
\ WEST MYRTLE STREET
�\ I
\ E m ro nvn[ n
\el _ ; -- —s
+
elw�O•IWrt IIISrORIC UNDE/AINEO RUNOfF
If
I ; I
I `+
I i
ARFM 0.3TT ACRES
r j &ISM I I.. .we- ETWEI aeaRc�r\r\
ARIA_ 0 A,7 ACRES
IB, j I„+ HE =
JI
y —
Y, }
how
4.1
I®eAEI4VM'
IW.YL
[p
4V(14Y
96 M
I/L6e
1C01
�'w b se'
4
Aty
EaC
NE%PARAM
awY
eae
ea
It
P
�'
� ,
•
i
R
.,
is ,m
j +r I /a
O a j N _ J� rAre ,/aeroma..ew
H.W:Lw MM
0
U
I I
i M9 u
I 1
% EASr nla'IM aEY�epe 4.I I d
I
I Area,
I CXT I-1/$ $ttKW BfiOf FESMENEE
I win aesEulNr enevrrRNr I I � sS50 ■.
j!�� rs rib
,
I ,
I I
I I
I I I I
,
f
------- _
F
r
j _ _+ —
+ 1---- ----- —
t.
Ar
4. — 1 i.Y�%%-�%-ai�a%�
I I
I
J
I
li I I
I I f
I I
0
EXIT ra AAMF n
ro6[ aidEo u�n
zp e- pa aura
,: Ixslamc wm['TAv+�o Rworr - -
2FEL %.
•*) a �2'Y[14 SLd4Y (— 6•• nY%R NEfME4K Wl
itit
I
PROPOSED 4-PLEXI
W/ BASEMENT 1°p� F'w
i' GIRAGE
I M. FR. = 4999.00
r' I
I 8
FIN FL& 590I.00
BSMT. FLR - 4992.00
r
+ I
OaR,
m� 4
--- e ----- waaW,------- — ----
t
N
SCALE: I 10'
to 0 IO 10 M
ORIWSG SC11E - EEEI
NOTES:
- r. The top of / hotion elwauons shorn
am am minimum eevabowf rl9ui/M Its,
protection from the fo0-year storm. Minimum
Onbhes floor sleemtions chom the 100-yr water
sum ce in stints, chonmis, ditches, sorbs, or
other drainage facilities, as illustrated by a
mastar grading plain am to as shorn.
1. A rinsed grading and drainage plan will as
submitted if a subdroin system is neauired for
basement construction oker the dpnheN
lnspcbon is mods by the foundation engineer.
I+
a
I
H %:L ca.,e
jl `,
I I
LEGEND
AwNu, nlruE�Pll
—w—w
WATERLINE
+�
,� q"I�I
s—s—
SEWER LINE
as
GAS LINE
.0
J I
T T
TELEPHONE LINE
•,'+h
q
Q
I
I
lab
STORM DRAIN
EXIST CONTOURS
I
+ evw,
EXIST TREE
PROPERTY LINE
-
BASIN LINE
D
N
I #
ef I
111
FINISH CONTOUR
yy
•"s I
eft
DRAINAGE FLOW
I h
�
I I
I
—X—X—X—X—
SILT FENCE
elm
EX/S7 SPoT ELEY
Mj
I I
• 9 30 PROP SPOT ELEV.
— 00-10,
I
I
City of Fort Collins, Colorodo
I
UTIUTY PLAN APPROVAL
APPROVED:
py Em:,..r had,
CHECKED BY.:
I
vow It wommoe,r Obey win
I
CHECKED BY:
tihmmmew utuy Law
CHECKED BY
�I
91
Fero. • fimm >n rare
CHECKED By.
—s
,mrxe aerrer was.
CHECKED .
bin
2
I
itR
3g"g
Lot
a
a
'^
U
�i�FC
5
4y
�tl
N$
\
ti
9
u
M®