HomeMy WebLinkAboutDrainage Reports - 01/05/1992�7
1
Rev i ew'A
Final Approved Report
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FINAL STORM DRAINAGE
AND
EROSION CONTROL REPORT
PARK SOUTH P.U.D. SECOND REPLAT
Prepared
for
MARC MIDDEL
Prepared
by
STEWART & ASSOCIATES. INC.
103 SOUTH MELDRUM
FORT COLLINS, COLORADO 80521
9
oEc z¢ 1992 --
�J FINAL STORM DRAINAGE
AND EROSION CONTROL REPORT
PARK SOUTH P.U.D. SECOND REPLAT
LOCATION AND DESCRIPTION OF SITE
Park South P.U.D. Second Replat is located south of Horsetooth Road
on the west side of Manhattan Avenue. The gross area of the Second Replat,
including one—half of Manhattan Avenue, is 15.77 acres. Manhattan Avenue
is existing pavement with drain swales along the sides, and runoff in these
swales empties into the existing drainage channel running from west to east
along the south boundary of Park South P.U.D. Park South P.U.D. First Replat
is a previously approved plan which is located adjacent to the southeast
portion of this Second Replat. The gross area of the total Park South P.U.D.
to the center of Horsetooth Road and Manhattan Avenue is 31.30 acres. A
map of the total Park South P.U.D. area is included -in this report. There
is an existing 36—inch storm drain along the west side of Manhattan Avenue
running from Horsetooth Road to the existing drainage Swale.
HISTORIC DRAINAGE
The total Park South P.U.D. site drains to the existing Park South —South
Glen detention pond constructed in the early 1980's. This pond is located
on the east side of Manhattan Avenue, just across from the Southeast corner
of the Park South First Replat. The existing major drainage channel across
the southerly 30 feet of the Park South area drains to_this pond. The pond
has a volume of 11.6 acre feet and a high water line elevation of 5044.0
and was originally designed with a volume adequate to provide detention for
the total Park South P.U.D. This volume design was based on all residential
development in the Park South P.U.D. Now there is a business area proposed
on the north 13.8 acres of the site. The business area will require some
onsite detention to compensate for the additional run—off generated, but
until the time of development, it will remain a field, and its historic runoff
will be handled by downstream facilities.
PROPOSED DRAINAGE DESIGN
There will be no additional onsite detention required for Park South
P.U.D. Second Replat which is all single—family residential. The runoff
will be carried in the street gutters to inlets and storm drains. The storm
drains will empty into the major drainage channel across the southerly 30
feet of Park South P.U.D. and into the existing 36—inch storm drain along
the west side of Manhattan Avenue. The maximum allowable gutter capacity
for local streets will not be exceeded.
The attached plan shows the sub —basins along with the direction and
quantities of runoff.
Park South P.U.D. Second Replat
Page 2
There will be offsite flow into this subdivision from the Four Seasons
Subdivisions. This offsite flow will occur during 100-year storms and will
all enter the site on Dennison Avenue. This 100-year offsite flow is 44.5
c.f.s. per the final storm drainage and erosion control report of Four Seasons
Seventh Filing by Stewart and Associates, January 17, 1992, and it will be
carried in Dennison Street to the south and east to an overflow swale between
Lots 29 and 30. This swale will carry overflow to the southerly major
drainage channel. •
The maximum allowable street capacity for 100-year storms will not be
exceeded by the addition of the offsite flow from the Four Seasons area.
There are three site 'plans attached. One shows the entire Park South
P.U.D. and adjoining land; one is a detailed drainage and grading plan of
Park South P.U.D. Second Replat; and the other shows erosion control.
All of the storm drainage facilities in Park South P.U.D. Second Replat
shall comply with the current City of Fort Collins criteria and shall be
consistant with the master drainage plan.
EROSION CONTROL
Straw bale and gravel sediment filters will be placed at the catch basins
during the construction period. The entire Park South P.U.D. Second Replat
will not be overlot graded at one time. There will be two phases, and the
future phase will be left with the existing vegetation which is approximately
85 percent ground cover. The erosion control procedures are calculated on
the basis of two phases. The first phase will be Dennison Avenue and Dennison
Court, and the second phase will be Walden Way and Rockaway Street. After
overlot grading, a temporary crop shall be seeded and mulched with crimped
straw over the rear 70 feet of the graded lots. The rainfall performance
standard evaluation and the erosion control effectiveness calculations are
shown on the attached sheets.
This site is located within a low wind erodability zone, so the instal-
lation of curbs and pavement and storm water erosion control procedures will
meet the wind erosion control requirements. All erosion control procedures
shall comply with the Erosion Control Reference Manual for Construction Sites
of the City of Fort Collins.
Phillip '!.-Robinson, P.E. &
00 ''
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Stewart & Associates, Inc. 103 S. MELDRUM Si. Ft. Collins, CO 80521 (303) 482-9331
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Figure 5-2 (C7.8�� �� = ¢•8 C45
NOMOGRPAH FOR CAPACITY OF CURB OPENING INLETS IN SUMPS, DEPRESSION DEPTR
Adapted from Bureau of Public Roads Nomograph
MAY 1984 5-10 DESIGN CRITERIA
...... . . . . . . . . . . . . . . . . .
'71 mall I
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COMPUTATIONS S1cwARI z\SSOCIAI -S
Ca,wltiir36r31neeisaixl Surveyors
Ft. Collins, CO 80521 (303) 402-9331
F -f%1Z Date_ Al t Client: 1✓►ar� I -A ��G Sheet No. C of
By: Date Project' Eo: rrC SO'vtit/P '-s-_cone �
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COMPUTATIONS S.FEWARI-ASSOCIA ES
C011wllhr3EI&I)eersarxl Surveyors
Ft. Collins, CO 80521 (303),482-9331
BP�R Date. -.1tC " CIient:-AdG�r� M i del-C.I Sheet No. I_-L_ot
091 —ay: Date Project: —IFOf : -So ✓ N BUD ^.4 fZ(.R(C4. —
Subject 6 U 1- C r-- CG.RP C/ & — La Ga / 5rce 1/ f —
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RAINFALL PERFORMANCE STANDARD EVALUATION
-----------------------------------------------------
PROJECT: yARK SCiUTH Puj>-StC4n/D REPLAY
P,4A.5 E dN F
---------------
STANDARD - FORM A
COMPLETED BY: pi7;l 1gabiasyV%
---------------------------------------------------------------------
DATE: 817 i I 9Z
DEVELOPEDIERODIBILITY1
SUBBASIN
I ZONE
Asb I Lsb
(ac) (ft)
Ssb I Lb
(%) . (feet)
Sb PS
(%) O
---------
PHASE
ONE
-----------I-----
Nbc�era+r
I
79Ac1
900'
I
� /.2��
,
� 900
I I.ZS
178.�
9
t
---------------------------------------------------------------------
DI/SF-A:1989
Pa5e l g
EFFECTIVENESS CALCULATIONS
----------------------------------- ------------- --------------
-
PROJECT: PA.RKsovTai Pvv sE<W v0 RcPL----- -
.AT STANDARD FORM B
PHl�S E . ONE
COMPLETED BY: phf/ Robins& , DATE: B- /7 7Z
Erosion Control
C-Factor
P-Factor
Method
---------------------------
Value
Value Comment
'
8are. Scoi1
-------------------------------
1. U
1.0
Gt-QveI F)Ifer
1 U
U.8
pGvernen) � walf{s
ternpo-,tt- crop
Wif 1 Grlw
�. rNvlcl, O on rear 70 of 4-4 felS
�S�bhS.led cover . -
e 1.0 501', cover )11ey si Swale
uIf)n sU� 1, boohdar
_-_--_-__--••-----------••_--------
MAJOR PS. SUB AREA ----I
BASIN BASIN (Ac) CALCULATIONS
one 78,7 ----- 7. y.Ac Pv. ,1 walks --=--------------
/�MD, Grdp�rli^pecf t
M U1I I me-1 o n' rrq r- 70
o� 4-1-1 o-{,s = 3.4r7 4 c
Gs�o b�is=�e� c oven
bare ,5rounct = (-b'S Ac.
�Ilfid C = �1. 9 sx O I) t (3.
7.1
WSJ = 0. e
OFF -—(6.ic7X0.SOx IN z78.5
�los� enovJc
Ts5 <6 N / D,
---------------------------------
HDI/SF-B:1989
CONSTRUCTION SEQUENCE p o g e 20
PROJECT: 09RW SuUTPyl/J SECOND REPt,)T- Pkb95E ONE STANDARD FORM C
SEQUENCE. FOR 19` i 3 ONLY 'COMPLETED BY: DATE: Z Z 2
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
MONTH S 1 F 1 �„
--------------------------- -- - --
OVERLOT GRADING
WIND EROSION CONTROL
Soil Roughing..
Perimeter Barrier
Additional Barriers
Vegetative Methods
Soil Sealant
Other cvrl> ¢ pv/,A+,
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
STRUCTURES: INSTALLED BY MAINTAINED BY
VEGETATION/MULCHING CONTRACTOR • .
DATE SUBMITTED
00 HOI/SF-C:1989
APPROVED BY CITY OF FORT COLLINS ON
a 1,V 1 p
--+--------------
JANIARY 1991 8-20 DESIGN CRITERIA
u
pace Z
-----------------------------------------------------
RAINFALL
PERFORMANCE STANDARD EVALUATION
PROJECT: P,c)RK Sour" Pl/D sECoND REpLAT
---------------
STANDARD FORM A
121-)As E rwd
COMPLETED
BY: pF7;/
Fzobins ah
DATE:811 9Z
------------------------------------------------
(DEVELOPED
ERODIBILITYI
Asb Lsb I Ssb Lb
Sb PS
SUBBASIN
ZONE I
(ac)
I (ft)
I--(X)-_
(feet)
i ()
I
Moder4e !
7 g A.
----- �-
y7o
�
y
I /, p o
-------,
9711
--(9;)-_0
�.
,
-------
o
179.3
� PHASE
f
/
Two
II
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-ie eveoner'
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re
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GphS BUG
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I_____________________________________________________________________
HDI/SF-A:1939
pc(ae 2Z
EFFECTIVENESS CALCULATIONS
-----------------------------
PROJECT: Y19RKSoUro Pvv
SEcaA,-.------,-T
---------STANDARD--------
REFL FORM B
PH/)5E. -fW p
COMPLETED BY: _phr/ Rabrn
of
DATE: B. !7 I
Erosion Control
C-Factor
P-Factor
Method
---------------------------
Value
Value
Comment
are- Sol% . . .
- ---
t. 0
----------------------------
. (.0
G-rcaoet Fitier-
1.0
O,e
Pat ✓e-r-%e.4 C-nd in/alk s
67.01
1. 0
Te r- o ra ry c,-o p
w�P4 criiv.�gd Jtivtcl,
d.06
!- 0 on
,
rear' 7Z o-� ¢7 145
MAJOF
BASIL
r HAS E
rw 0
PS
(ro)
78.37
SUB
BASIP
AREA
(Ac)
7.9Ac
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
CALCULATIONS
p�M�- � wa+t 12s � I • l8 AG. ------
1 er%P, . em, wrt'b• _
crtMPcd Mvlcl ¢, 07 Ac
bare sor( 1.83 Ac
7• y
0,2�5
vJ� Z 0, 8.
------------------------ =--------------
-------------------------------
HDI/SF-B:1989
COMPUTATIONS
Stewart & Associates, Inc. 103S.MELDRWAst Ft. Collins, CO 80521 (303)482-9331
Date Client: 06qr-<-- A
-QI�Sheet No. -3 C.Jel -, .
11 Y: - of
Chkd By: Date- Project: PUJ2--SEe,0,,AJ_t> TZ E T>4L - A 4
Subject r-o s i o r) a ^-�ca (fo s -Lf
PNA�s r= I ary ,� I I! I, I � �__ � I I ! � i I
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101
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74AIN/-1 GF /a3�E : AS
At
LE GE N PEw,oa.os Certification' -required hall requlon Lots zv Eas and
.e5 thry 54 as to lowest opening elavatlons AM as to the fact that
"Moll I s-, 4E/a /5 B /. c. - sal z4 - rsTlnlO �GN�...,�C ertbantmen is on Adjacent wales and ponds Mv° not Wn tlrarraty
4TVDEVE C J 20 S4 NISN NT4V^ 2 r1 iryactM.
OETE J C - O O IQ
OEIfNi' - VRO/ OFO IN OLLS'TE P9^D _ I LOT 29 LOT SO
r, IF
r " I N3 It C TO FS fr ° W M. 00 EN �+ 0
=RTV L le l o�+'� III It °w+lanoE eL�]y
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too Z a ,�1.7 Io4E5, avF. n �ti�e LLQ Y9.°N t �MS 0 /R IL OG[N N4
♦.E'V 50 //� I t/ I'O * LG • E N, iQ 'I FLOOD TYPICAL ELE VATIOrv5 rzs'eVe(p�Ep O� 2 E• {..♦/ I { "5n„5_ `vLN16B[u� Z {ld
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To•P�Jh DE'J MELCeC L AV AT
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AUCTION e-A Ct a
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D a .
eECTIo.5.0 U.
METAL SOEW.IL N CYLVEF I O a
NONELee
CITY OF FORT NV ?
.SU
ale,. a N N_oIT an 1
F
Q
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NA
NOTE
1 DRAINAGE TFLpi LE GE Nam: an Engineers Cart if cation snail be requ I red on lots 29 tnru 43 and
II ' sRo-5 To gpFA ' 11.8 Ac. 501 I Tt �o r c- m tnm nt astolowest opening elevations x and as to the fact that
fW111 pp LFT IC c O t0 - sT' Ie impacted. tz o adjacent zralez and ponds have not been adversely
Fi-
OEVE O 20 C O. eU N impacted.
_ TFMvaCPR'C VEiENTIUV pap/rp EU M OFFS1TF III ,mr Wotr it LOT ZI LOT 30
ORaVEL � ramp. Boa y_.. r.d.. v-,.. m .00e O .e N. o s _ r
01 TUAN-NRJVND m Ip`an I '� JOIN 1113
11
r I L o4/r NOGe E III .,ram
• O I -LL wEo) o,
k— o � � 55 i ev.N Fwr£ HJIN n 'm N Na �:N..
m i `r onnT/a +cD q I
scn Le so / h ca.� e ICAL r?Le vaTo. s LpI Y a .m "awe />, 1s.e
�� l • __ r 6 Y rT
' E I n` j r i� III = 7f S {
�N
pap
J V a f V SECTION E=E _
I 1+ R ye I, v _ II
i
�tE 3 wEEN Ts •9 fr 30 ^-
i� 2 3 e I Fie I r { 1 I z O
9 3' I N s n >d I i in 4h I y r
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'PPT Je
l� F-
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OF
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n
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L fl edt e N - Hsu _ems" _/(('L, ass I �F - - F- F Nrs a
L - w- y ��Capita-
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g ° I E� 1�+ '� 4, e1 „ � ' i'. DFnrN o Y I
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'IY a°t- -�1 IAs�rAtt � � W
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V 5 DE SWFLF
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u,�i/ G__ _- I �� ' FstNp ASINM o. � � a l 1 fi 111. 1.-1--.�' �1� 'pdIPip OF
a
pa
DO
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-
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«1
+ zG I I a. r7Y�, ">LI
/�-�]J 1� {f.a _ Y ;w' om % .11 III IJ �'I ernmw ewe nma
i / / 1 IIyI7IgIS ri �__ <Nww<, F.aX.
sp ZINFit W Z _ _ a_ .J VAI �l al I II 4- ,'I b 1
',rl `� c I I az w . 1 ���} 11 '�I I n III i I�I p li I _
'I n �'� ,1 ve.lia,{ ill "' jPIG Li III u Ij1 IcEosYw toxrPa �.: ��'�::�.'tir.
III / F �� " I I i _ '�, 9s i I u.- /j �G_. _ I ^� III ��-7Ti .'o I II'j If
I1 ions: erosion
control
-n :fa. ee as•snan <oantr au aq ofFort
• I SS-�' p
¢ u _ _ _ - IIr 111 : ll ,li 12. The contractor shall provide tabor and equipment required to Z QI;
- I I 1 1 I clean off .n a.6rvs and Ialla tr.<xw onto pawed streets. tsePr
{ 1• 41 1 :1 aid n II l/ ll l / I V 3. The Phase One Construction sequence will comply with the mart Z O 4 U
> /, 1 ze h /I I l� n u� �� I 1 p I shown hereon and a new tonstroctton sequence. along with the W u •F�
z ! 1'4 I ^,/ ` y /-m„ "I
,V ul1 llI r a / PI I M1' I I required ceffmnance bona. shall be submitted to the City prior yl ` r,
a I I n f G yz •����$� .�� �� �� g /,l // L I 1 d 1 to b innin construction of Phase Two. O
hF F e ENNI50 'rbi V EN VE�•� �� L VF' / / beginning
d 3 �q /. Ac p %/ o ' t ���^'� I I I/I / I N '4l I 4. Gravel inlet filters shall beinstalled [ each curb inlet ti
l V I t c .� s e '/ I I ,I / 11 r i I immediately after its construction.Z �j u
Q g N 1'l� l;;' A/ 6 ( I 5. The rear 70 feet of all lots Ph O hall be seeded ..M Wr
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