HomeMy WebLinkAboutDrainage Reports - 11/01/1993FINAL STORM DRAINAGE REPORT
ROCKY MOUNTAIN HIGH SCHOOL ADDITIONS
PREPARED
FOR
POUDRE SCHOOL DISTRICT R-1
c/o ROBB, BRENNER AND BRELIG, INC.
PREPARED
BY
STEWART & ASSOCIATES, INC.
103 SOUTH MELDRUM STREET `
FORT COLLINS, COLORADO 80521
303/482-9331
NOVEMBER 1, 1993
Z1 ZJ-) 95
FINAL STORM DRAINAGE REPORT
ROCKY MOUNTAIN HIGH SCHOOL ADDITIONS
SITE LOCATION
Rocky Mountain High School is located in the Southeast 1 of the Northeast
of Section 27, Township 7 North, Range 69 West, of the Sixth P.M., Fort
Collins, Colorado. The site lies north of West Swallow Road and west of South
Shields Street and contains 50 gross acres. The site is located in the Spring
Creek Drainage Basin.
EXISTING SITE
All that part of the site located west of Rocky Mountain Way is presently
developed as the school building, paved parking and walks, lawn, athletic
fields, and tennis courts. The building roof and the open courtyard located
between the building.._ wings drain into storm drain pipes which carry the runoff
into the north gutter of Swallow Road and the west gutter of Rocky Mountain
Way. These storm drain pipes are inverted siphon lines which bubble up behind
the street sidewalks and then run through sidewalk culverts into the street
gutters. The flow in the north gutter of. Swallow Road runs east and crosses
Rocky Mountain Way in a concrete pan, and then continues east to a catch basin
at the northwest corner of Swallow Road and Shields Street. Overflow from
this catch basin can go two directions, since the overflow elevations are about
equal at 0.6 ft. above the flow line of the gutter at the catch basin. One
overflow route is around the curb return to the north and over the high point
in the west gutter of Shields Street. This high point is 100 feet north of
Swallow Road. The other route is over the back of the curb and walk to the
northwest, and into the existing low area, which is being utilized as a
detention pond area by the new drainage facilities being constructed on the
school site. The existing low area presently has no outlet. The flow in the
west gutter of Rocky Mountain Way runs north and then turns to the east to
Shields Street.
There are no storm water detention areas on the existing school site.
PROPOSED IMPROVEMENTS
The improvements will include additions to the buildings, additional paved
parking and concrete walks. The gross.,area of the existing site, including
one—half of Swallow Road and Shields Street and including the Wetzler Lot,
is 50.35 acres, more or less. The existing impervious area of this gross site
is 716,100 square feet or 16.44 acres. The additional, impervious area which
will be added by the proposed improvements is 233,000 square feet or 5.35 acres.
This includes 4.33 acres of proposed paved parking located on the east side
of Rocky Mountain Way, although only 1.79 acres will be paved with this first
phase of construction, and 2.54 acres will be paved sometime in the future.
There will be some revisions to the existing curbs and parking lying west
of Rocky Mountain Way, but the larger portion of it will remain as is. Also,
the curbs and pavement on Rocky Mountain Way will remain mostly unchanged.
The proposed new paved parking area east of Rocky Mountain Way will be
designed as a detention pond with outflow into the existing storm drain along
' the west side of Shields Street. The entire 4.33 acre parking lot will be
graded and bermed during phase one construction so that detention volume will
be provided on the area proposed for future pavement as well as on the area
to be paved with phase one.
Rocky Mountain High School Additions/Page 2
Flows along the north gutter of Swallow Road will be diverted into this
detention area along with runoff from the building and onsite paved parking
areas. We propose to detain runoff from the existing and proposed school
buildings and also from the existing and proposed parking lots on the school
site, except for the north portion of the west parking lot which drains through
the athletic fields in a wide Swale. No detention is proposed for the athletic
field area. The existing runoff from this area (Basin No. 1 on the included
plan) is Q2 = 9.1 c.f.s., Q10 = 16.8 c.f.s., and Q100 - 38.1 c.f.s.
The Shields and Swallow Drainage Study prepared by Rocky Mountain
Consultants in February, 1991, provides several alternative solutions to the
potential flooding at Shields Street and Rocky Mountain Way. One alternative
is to divert flows from Swallow Road into the School site where they will be
detained. A plan of this Alternative No. 4 is included in this report along
with a plan of the existing drainage facilities labeled Figure 2 by RMC.
Alternative No. 4 indicates 6.1 acre feet of detention in a pond in the
undeveloped area east of Rocky Mountain Way. We propose the detention be in
the new paved parking areas and also in the existing vegetated low area lying
south of the new parking areas. The maximum volume of detention which can
be achieved in these areas is 5.1 acre feet. Although this is only 84 percent
of the 6.1 acre feet proposed in the R.M.C. report, it will greatly lessen
the flooding potential of the Rocky Mountain Way and Shields Street
intersection. Included with this report is a plan of the school site which
shows existing and proposed improvements. Also shown on this plan are drainage
basins, drainage facilities, and peak flows at critical points.
Runoff from the north gutter of Swallow Road will be diverted into this
new detention pond by reconstructing the intersection of Swallow Road and Rocky
Mountain Way. The runoff in the north Swallow gutter includes flows from the
Silverplume and church areas located west of the school site and runoff from
a part of the west school parking lot and approximately half of the school
building roof drainage (Basin No. 2 on the included plan). This roof drainage
is piped from the building to the back of the walk on Swallow Road where it
rises in bubblers and flows under the walk in a chase to the north gutter of
Swallow Road. There are two detention pond areas proposed. The south
pond,which is partly paved and partly natural vegetation, will receive the
flow diverted from Swallow Road; and the north pond, which is also partly paved
and partly to be revegetated, will receive flow from the parking lots on the
east side of the school and roof drainage from the east and north portions
of the school buildings (Basin Nos. 3 and 4 on the included plan).
Runoff which now flows north in Rocky Mountain Way will be diverted into
the new north parking lot detention pond by placing a flow barrier across Rocky
Mountain Way. This barrier will be an asphalt hump in the pavement
approximately six inches (6") high. Also, it will be necessary to construct
a concrete pan across the Rocky Mountain Way pavement to eliminate the crown.
The attached calculation sheets show the theoretical maximum release rate
and detention volume required for the entire school site per the City of Fort
Collins Storm Drainage Criteria. These quantities may be unrealistic,
especially the release rate, since most of the site construction has been
existing for more than 20 years. We propose to allow the runoff from the
athletic fields, the area which is the northerly 20 acres of the site located
west of Rocky Mountain Way, to remain as it is now. Most of the school
buildings and paved areas and also diverted flows from Swallow Road will be
routed to the proposed parking lot detention pond.
Rocky Mountain High School Additions/Page 3
The detention ponds will hold a total volume of 5.1 acre feet, with a
maximum release rate of 7.0 c.f.s. This release will be through an existing
15—inch RCP stubbed into the school site from the existing 24—inch storm drain
located in Shields Street. The release rate of 7.0 c.f.s. will not adversely
impact flow in the 24—inch storm drain since flow in the north gutter of Swallow
Road which now enters the 24—inch storm drain via the 5—foot inlet at the
northwest corner of Swallow Road and Shields Street will be diverted into Rocky
Mountain Way and then through the detention and release system.
The City of Fort Collins Storm Drainage Design Criteria was used to design
the detention ponds on this project.
The way the detention ponding and release facilities function is as
follows: There are two ponding areas. The south pond has a volume of 1.4
acre feet and a HWL of 5067.0, and the north pond has a volume of 3.7 acre
feet and a HWL of 5066.0. The 15—inch outflow pipe begins at an inlet in the
south pond and flows north to an inlet'out of the north pond and then continues
on to the east to be tied into an existing 15-inch stub which goes into the
Shields Street storm drain. The flow from Swallow Road diverted into the south
pond will quickly exceed the capacity of the south pond, so we have not
restricted the outlet pipe at the south pond area inlets so that more flow
will be carried to the north pond area inlet. This north pond area inlet will
have its outflow restricted to 7.0 c.f.s., which will cause flow from the south
pond to backflow from the pipe and inlet into the north pond. This will fully
utilize the larger capacity of the north pond. When the outlet pipe from the
south pond is at full capacity and the pond is full to HWL, overflow will occur
from the south pond into the north pond through the driveway between the south
and north parking areas. The north pond also receives flow from the drain
pan across Rocky Mountain Way. Any overflow from this ponding system will
be over the pavement hump constructed in Rocky Mountain Way. The overflow
will drain north and east on Rocky Mountain Way to the Shields Street
intersection, just as it has done prior to the detention improvements. --
EROSION CONTROL:
Rocky Mountain High School is located in a moderate rainfall and wind
erodibility zone. Only Basin Nos. 5, 6 and 7 are included in the erosion
control Performance Standard and Effectiveness calculations, since only on
these basins is grading taking place. On Basin Nos. 1, 2, 3 and 4 there will
be construction of buildings, walks and pavement, but construction of the
footings, slabs, curbs and pavement will immediately follow removal of existing
pavement and grassed areas, so protection will then be replaced and no bare
soil will be exposed. There will be .silt fences required on Basin Nos. 1,
2 and 3 around the construction areas. The filter fabric may be placed on
the chain link construction fences around the building sites.. Basin Nos. 5,
6 and 7 will have mulched temporary crops, silt fences and sediment filters
placed, along. with the construction of curbs and pavement, as erosion and
sediment control procedures.
Prepared by:
�T.•
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Phillip Robinson, P.E. & L.S.
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m =-�DIRECTION OF SURFACE FLOWS 15 DETENTION POND DETENTION POND y`�«<c� 15
rz DRAINAGE DEVIDES OUT FLOWS
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O DRAINAGE CONCENTRATION POINTS POND !
(SEE TABLE 2Q3) SUBSURFACE PIPE SYSTEM
SUBCATCHMENTS AND
POINTS OF CONCENTRATION
FIGURE 2
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STEWART&kSSOCIATES
Consulting Engineers and Surveyors
103 S. MELDRLIM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
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PH. 482-9331 FAX 482-9382
Consulting Engineers and Surveyors
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.STEWART&ASSOCIATES 103 S. MEL933DRUM1, FORT COLLINS, CO 80521
PH. 482-FAX 482-9382
Consulting Engineers and Surveyors
By' - P1 7?, Date: 9 3 Client: Sheet.No. of
Project: c- Lc /L4 oL,,, rJa 0 n J4 LiSGIi o al
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.STEWART&kSSOCIATES 103 S. ME DRUM,31 FAX FORT gOLLINS, CO 80521
Consulting Engineers and Surveyors
By: P 1 Date: Client: iz 3 -} 1`3 Sheet No. C) of _
Project: m mil, .'G/ l 0a� / _
Subject: U �o. /l�C'�✓ �P'%r��7I'ah %�onn /l IZ on 130-f/lo. 61AI"A;pd'\J)
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STEWART&ASSOCIATES
Consulting Engineers and Surveyors
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
By: P l ]Z
Date: G 97 Client:
+ T� Sheet No. / 0 of
Project: O Gj.,
oai
,/t4ov^iC.1
Subject:
T pOrllCGh I-- ; j 7
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i
VV q..7/ Sr �' iSY Y sZ ,i„ _ l4�` t?I� 'resirtL��oh
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STEWART&&SSOCIATES
Consulting Engineers and Surveyors
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
By: P)1Z Date: 3 z Client: R 13 t f3 Sheet No. i 1 of
Project:
Subject:
isat
ot�elr lo;✓ (_n0 r
_ h.)s
ih
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c _ BOG. _Ytz_
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s1`0lr. 1-1i0)V1
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slh --v. _are-� i�(e. I w:if �, I resf� i��i�e� o�llel
-_ I �� Ik __ i /are li> I�%� =.11• i3 is
_ l 0.75
0.03-L
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STEWART&O SSOCIATES 10 S. MELgg DRFM, F4O 9382
COLLINS, CO 80521
Consulting Engineers and Surveyors
By: Date: 3 Z Client: K l3 } T3 Sheet No. R— of
Project:
.. Subject:
0-
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3?,.23 _c s--- 63_� 3
✓ e 'ems �l-0{ each �i^' S✓alto✓ a r
a
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.STEWART8&SSOCIATES 103 S. MEL9331DRUM,FAX FORT COLLINS, CO 80521
82
Consulting Engineers and Surveyors
By: Pis Date: 3 2 II ff Client: T-Z � f 6 Sheet No. 13 of _
Project: FO Gk y /A Uc/ h�a D ^ fl �� SC'; o a/ _
Subject: in / rI Gk)e. r7./ i C�
0,04 i
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a,.0It) _ 1. G¢I
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;,II!
.STEWART&ASSOCIATES 103 S. MELDRUM, FORT COLLINS, CO 80521
Consulting Engineers and Surveyors PH. 482-9331 FAX 482-9382
By: Date: Client: TK 9 4 F3 Sheet No. 14- of
Project: 0�<4
KO Subject or -I< rv^oT-� -YFo� ot r-e^- ber4wee-1 Ctcy IIAJh 14.4-y Sir el Jf
&-71 t.
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J,
.STEV VART&ASSOCIATES 103 S. MELDRUM, FORT COLLINS, CO80521
PH. 482-9331 FAX 482-9382
Consulting Engineers and Surveyors
By: F ) TZI Date: 3 2 q ¢ Client: F� 13 -t Sheet No. L of
Project: lei o G� ti I A oyn +a 1 ti l� }� h .S c%� o.7 _
Subject: Flo g✓ 7V �� 1 eldS - Fd clty M4r, h -ker--f fC ail
_>
T/
- �Q�si—�;l-
-�-
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oNI
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f
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�o I ! + I .0-1 toi
3':�I
ro Ta y 1_ 1 I . i z° Gas
I
i
RAINFALL PERFORMANCE STANDARD EVALUATION
PROJECT:
i�iocicr /✓1o�..�Ct iti }}151�
Addikor%(
STANDARD FORM A
COMPLETED
BY:
F/IZ
DATE: /0 so 93
- --
DEVELOPED
----------------------------------------------------------
ERODIBILITY
Asb
Lsb
Ssb
Lb
Sb PS
SUBBASIN
ZONE
(ac)
M
(%) .
(feet)
(%)
(%)
----- ---
57
-----------
ModertAbf
-------
z .7/
-------
460
----
Q S
-------
-------I
-----
I
7
7-55
4vv
o.8
O. (;3
74• � e
4-77
---------------------------------------------------------------------
I1)1/SF-A:1989
PAGE 23
C
O
C
O
J
O
U
I
I O t d 1 O C O
I
I v 00 Ln Ln
I co 00 co
O O 00
1 01 01 01 01 C G O O C O 1
Ln Lr; L' Ln Ln Ln
1 N N N N N N N N N N
I
I . . .
1 c7 -zl-C'Czr V -:I- Tr ml- �rC'C -�rLn Ln Ln
1 N N CO CO CC CO Cc CO CO CC CO CO N N CO
1
I n N N co m al 01 O1(ON 0)(n m m a) O+ On 01(n m0)
I
I co co N N co co N co co co co co co N N co co N N N
I
i C M cr Lo LD LO LD LD r-- r\ r\ r\ n n n r\ n r\ r\ n co co.co co co co
I '
1 C' co co CO co co 00 co N co co N co co co 00 N N N N co 00 co 00 co co
1
1 N N M .1*1 Lo Ln Ln t0 Lo Lo%0 to to r\ n t\n r\ r\ r� r�- r� r� co co co
I
I M�c7'cY��Cct C'ct ct d'�'�c V � �cY a'�'Q ctCV ct
I co co N co co co co co co co N co 00 N C0.CO N co co co co co co co co co
I
I LO O N M Cr' Lo Lo Ln Ln Lo LO LD LO Lo Lo to LD LD LO r\ ^ f\ f\ n r\
N NNNC N N N co 00 co N Cru co co co N co co co co co co co co co
1 Ql r1 N M M V �r Ln Ln Lo Ln Ln Ln Ln Ln Ln to Lo to LO LO LO r\
1 00 00 000000 N I~ N co co CC CO co co CC co co co co 0000 co 0000 00 co
O 1.0 N O .- r N N M M LM M ct cY c. cY cY cT Ln Lo Lo Lo to LD
MMM Z1, a' a' v ct cY -cl, C' a'c!'v -Ci- -CT ct ct -zil V act ct C'ct
N N N co N N N. N N co NNN C;.` N N N CO co N CO N N co N N
Ln N Ln r� N m O NNN co M M M M a' ct ct -�r d-
NMf'MML'MMC
C' N N N N N co N N N N N 00 N N N N N Co N N N N N N N
r+Nr MKl'Wf Ln LD LO I\ r\ r� N m C N N N m m mCC 000
N N M M M M M C4 M M M fM M M M M I+'Y C"; C) M M C' -0:4 c: a'
N NNN N N CO N CO N N N N N N N N N NNNNNNN N
Lo Ln N O.-I N M cl ct Ln Ln Ln LD LO LD LD LD r\ n r\ r\ N N N MM
' N N M M M m c n m m M M M M M M M M M M M M M M m m
co co N co co 00 co co N 00 0000 0000 co co co co co co co co co co co co
r1 •-1 Ln r\ NO C.--IN N m m MSC' ct�Ilct Ln Ln Ln LO LO LO r\ r\
. . . . . . . . . . . . . . . . . . . . . . . . .
.--I N N N N M M M M M M M M M M M M M M M M M M M M. M
00 co N co co co N N 0000 N N 00 co co co co co N co 00 co co co co N
M" LD co 01CN N N M cn M �r V V ct ct ct Ln Lo Lo Lo to LO LD LD
Gam. .- '-+ N N N N N N N N N N N N N N N N N N N NN
N OC N co co 00 Cr co 00 co OD cc 00 co co co co co co co co co co co co 00
Ln LC! O:NM V'Ln LO 1-: r- 0 CO C0 Cn 01 Ol Cn Cn Cr 000000
. . . . . . . . . . . . . .
01 C O N N N NN N
r� N co N N co co co co co N N 00 N co co co co co co co co co co co N
a to 0 M Ln LD 00 Cb M004.--I NNNNMMMMMM
N Ol O O O O O O O 1- 1: rl r--1 r4 .: 1- 14 11 .--I 1� r: 14 11
r� r� g co co co N co N N co N N N N co N co N co co co co co 00 co
CO N C.--1 cIn l-,l-,N C10)00 r+MMMMM
.
LD co co O aN m 01 Ol On C) Q) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
r\ n t\ r\ n n n n r\ r-. n N CO CO CO CO CO N CO N CO CO CO CO CO 00
LO•M OcI-n QI C) -A NMM V' -:Im Ln Ln Ln Ln LO LO LD LD n r\ LO LO LO
v LD r-_ r-I r-_ r� co co 0a co co N 0J N co co co N N N N co co N GO co
r� r� r-_ r� r� r` r%l r-I r` r" r%l r%.- r� r., r� r� r� r� r� r� r� r� r� r� r� r�
m 0 st LO r-� 00 N r-I r%l r� LO Lo tO Lo V'ct M MNN C N Lo K:r O1 LD
O C V N N N C V N N N N N N N N N N N N N N O O
r�r-_I--r-_r" r.-rlr-I r"I,,r"r�r"rlr"r--r�r�r�r--I--r�r-,r�r--r--
1 S 1
1 3 F- ^ I O O O O O O C O O O O O O O O G O 0 0 0 0 0 0 0 0 0
I Ocz F-- I O O. C) CD C) C) C C) CD CD CD CD C)O CD C) CD CD CD CD CD CDC C) 00
1 JZ W 1 r-1NmCr Lnl0 r�wm0.--IN M ct Ln LD r� N m C) Ln 0 Ln 0 Ln CD
1 U- W 1 M V Ln
I J
TABLE 5.1
n
EFFECTIVEIIESS CALCULATIONS
I------------------------------------------- ----------- ----------------
PROJECT: S MIUARU FORM D
ICOIPLETEU BY: ��Mocn�pia ILc/-}dJLionf UAIE: jell Zq
Erosion Control
C-Factor
P-Factor.
Method
Value
Value Comment
-----------------------
bso'i
0are
0.
vrti con
eext.4 ve5e%�ilo"
v,o8
IJ
/r'� crop d-M.✓ICI,
0.0(
1/6
.5fT
�Cncc
1.0
.1.0
0.S _
S f row ba1C •Fibers '
• 1. p
d,8
MAJOR
UASIII
-------------
PS. SUB
(o) UAS I II
74-. 3 5
AREA
(Ac)
z.� 1
--------------------------------------
CALCULAtI011S
--------------------------------------------
'exis)-. ve3e�c1-l0,4 l,3 ac
Pv^%1- �- conc
Pore Sot) 0,2JaC
s4-r4t� Fryer
EFF'= 1- alzx o.8�xtro = 90.4
3.YO /7V/ti� CC-ONL I.Iq aC
fc.,\p cr-o I-AVICS Z.SI.aC
barc S PI1 I 6r.20 ac
TOTAL
3.
EFF 0.09 x 0•6) x 161 = 9 z- 8 7
bars soil I•lo ac
2.5Y'
p= '0.5- ec
EFF_ �� - o.9ex•�� xis = 76.0 ti
EFF z.71(90.o f 3��i�� •S + z.s5��7G.v
I I I F FF = 8 724- ------
IIUI/SF-a:19f19
1 ' 1
' CONSTRUCTION SEQUENCE
PROJECT: - Ho c Lir STAIIDARO FU1111 C
SEQUENCE. FOR 19y3 ONLY.: WIPLETED BY: DATE:
Aidicate by use of a bar line or symbols when erosion control measures villl be installed.
Major modifications to an approved schedule may require submitting a new schedule for approval by, the City Engineer.
93
YEAR
MONTH
---------------------
OVERLOT GRADING
WIND EROSIOPI CONTROL
Soil Roughing
Perimeter Barrier
Additional Barriers
Vegetative Methods
Soil Sealant
Other curbs
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:
Pennanent Seed Planting
Mulching/Sealant
Temporary Seed Planting
Sod Installation
Ne tti ngs/11a is/B1 anke is
Other
STRUCTURES: INSTALLED BY
VEGETATION/MULCHIIIG CONTRACTOR
DATE SUBMITTED
/SF-C:1989
I N,9
----_ --1----
I .T F
---------
I M
14
-
I
MAINTAINED BY
--
--------------------------�
- - -
I
- - -
- - - - - - - - - - - - -
I
I
• I
APPROVED BY CITY OF FORT COLLINS ON
1, - --- LEGEND
4" VE CONSZ VTFALL GUTTER
T. R[ cOR3 WITH
1 - - 2Y„SNFWLLVGUTTPR R6 WITH
1
SCf>LE L I"= 60 II CONTOUR!
FINISH C4NT4UR
E+LIST/NG QVILOING
: i ^
. •. .. •- L` _ L.. _._ i ". �.' - .. • ORAIniaGE 6ASIN 6OHY
• �. V> .' - / , �'• pRPINMG
PLONr LE DRECTbN
I7 OING
• _ I/( - OI VLRrvi 91L lV EZCV! AT 416. /IIOo .E.
1', ♦ R951N�W ,�' _ _ _ % % • f O RROVNp INI SNLETS BALE 6RRRIR'S 5
O L 1 " % i -_ O3 ALL conl[RETE TO LIE 391
x 5 �.
F }' BAS I Ny /N, 0. 7 ALL coNc vvAT (PANS a"+Yjc,r
1 n I C, _ f 1 I 2. JC ♦J /I Q. 1_ O SILT FENCE
1!/. 3 a I - 1 O 1 I ❑2 GL w ce. c-n,TR/a TIU POWT
i 1� EA4TN& a/I' 1
[_. 1 ST STOCKPILE
I • 1
I IGKFryF /
1 :'J ,BASIN NO.- I
L 1 4,r
23. 00 A 6 . L c5 I1
THBLE of FLOW Ar
_ CONCENTRATION POWT5
I 4, 4m �=
1 <F V 111 to.53 Cw 3z.z3 eif G 1;-4,
- 5 1 y 1 O 113 eif 35.8.4. yyq P
' - Ir -� iI,3 - •1 T / ,DF_ wo of .� O c•S,iSdk rr.pei5 ]e SeSS o
• --_ .+' ' I L SONST ASPHALT TaDTS B WDCUCLOA CONCRETE MP IN
Q �3Q RI _
Pool
Div IaT SvaFAa! cTIN `F •! • y 15.4 o-0I n.2 ciL soq
1 I\ 1 INr HE:�v 0EtENnoq ver+ �s _ , ex lsT
.. _. o -"P _ ._-_. ell- YP'si" — w \ 4", SIVIS I •i, 18.3 ei. ♦r 5. °m
TT'' .� - u... P
INTO
-. -._,
♦rR 1 0,0 15 O
y.
IF'
I J3\ mt rs'. uor S,iE:
L'aROOM 'I a
3.02
m
l �'
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MLO RLLET,OcR• N N �' RC RIOE70PLNI nG
0 VIA
••m•.1J,••• .• CIE TION Penn Ics a ! DRRINAGE 41
.. zLema n. �t Y1f
/ n - NORTH CN \ E Slr[ IN JaRINO. LPC p, li
••� HNt GG.p n .^
Velocity. 137 /SG Fr • U L. NTPL GROSZ SITF Ar6-I4
S 1• , ' I 5. C PRIOR TO ^OOITION5 ? O ^I z
" .. A: •nac: -b'h T T 1 I. Y ♦aBAIY7N No
IL C :o/TEV gpDry10 5 N e
RELOCATE I/c'OqJ 3.90 A9 ��. / t`[ ill
gaOUNp oumolgla PIDarTloN -1 _ I I 4 R I r • ./ / 1 1 s DFrFN+ION Po/JD vot =5
No. •/3 666 C�
'[i NaSiN "I [4 U EJ 1 - G pPTCNTl4N FONOFELEA5' gy
m..e.,., 5 12 9c f 9 3 i 7 TOTAL. FLONT9 xNEI E
Y > 1 HVMII`J VAY /NpLR5F h
• T ... 1 1 ` • ( C pRrOR IIIIIIA
To FIOM °'ONaTRvcn.
k .. ` N _ ,. , c "Gv 1, f .: CAI = R 1 13 C u d 1 / 1 F 'r 1 QIN at. R3 l
Of Izolff IIII, I" S I J F 0 TOTAL FLO•'P To SN/a05
d �' 1 •p �TO� . A� P O ,'. FROM ROC4V•SCNOOCTN WPND III"
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