HomeMy WebLinkAboutWPO201700048 Plan - VSMP 2021-07-22 (3)Us, Department of Agriculture .
Natural Resources Conservation Service
TR 55 Worksheet 2: Runoff Curve Number and Runoff
Project: Old Trall Development Creeksidee III- Phase Il Designed8y:. FGM, PE
Locattom Creekslde Subdivision. Checked By: FGM, PE
Check One: Present X Developed X
1. Runoff rurvo NnmhortFNi
FL-6NG-21A
06/04
Date: 4AV2,012
Date: 4/12/2012
Soil name and
Cover description
CN (weighted) a
Drainage Area
hyicgmup
(Covertype;.treatment, and hydrologic condition;.
CN
Area
Product of
totalproductf
I
Calculated
Description
(AAppendix A}
percent Impervious; unconnected/ m
connected
{Acres}
CN x:Araa
'S`Value
ppe
impervious area ratio)
total area
1310FILTER
B.
Impervious Areas
98
2.64-
'259.1
(Prop9sed)
Woods in Good Condition
.55
L59
87.5
70;6
416-
Lawns In Good Condition (75°%+Groundcove6
61
4,0
3=5
8
_
Impervious Areas
98.
4:21
20.6-
STR.83&Ditch
Woods in Good Condition
55
0.07
39
6219
5.89
Lawns in good Condition75%+Groundcover) ';
$R
155
216.E
2- Runoff
_
2-YearStorm
10'Yearstornr
Drainage Area Description
Frec uency-years
2
10
nfa
Rainfall, P (24hour)- inches
3.7
5.6
n/a
Runoff,Q-inches
1.17
2.55.
810FILTER(Proposed)
Runoff, Q- inches
0,76
1,90
STR. 83 & Ditch
Runoff, ( inches
Runoff, Q- Inches
Runoff, Q- Inches.
Runoff, Q- inches
-
Runoff, Q.- Inches
Runoff; Q-inches
U.S. Department of Agriculture
Natural Resources Conservation Service
TR 55 Worksheet 3: Time of Concentration (T0) or Travel Time (T,)
Project: Old Trait Development Creekside ill- Phase 11
Location: Creekslde Subdivision
Check One: Present X Developed X
Cheekome: T, X T, Through ttWrea n/a
814FILTER
S'ift.83 kC tCli� "f
Sheet Flow. (Applicable to Tr only)
Woods- Light
1 Surface description (Table 3-1)
underbrush
Dense%ras4
2 Manning's roughness coeff., n (Table 3.1
0.4
0.24
3 Flow length; L(total L5100) (ft) 1
100
1Lt7
4 Two-year 24-hour rainfall, P2(f Q
3.7
3,7
5 land slope, s (ft/ft)
0.09
6,A1
6 Compute Tt= [0.007(nigllol / P20,5 5
0:21 0.29 �
Shallow Concentrated Flow:
7 Surface description (paved or unpaved)
unpaved
Unpaved
8 Flow Length, L(ft)
550
400
9 Watercourse slope, s (ft/ft)
0.033
0,04
10 Average velocity, V (Figure 3-1) (ft/s)
2.9
312
11 Tt=L/3WVV
1 0.05
:003
Channel Flow:
12 Crass sectional flow area, a,(W)
13 Wetted perimeter, Pw(ft)
14 Hydraulic radius, r=a/Pw (ft)
15 Channel Slope, s (ft/ft)
16 Manning's RoughnessCoeff, n
17 V= [ 1-49ru1s°'s) / n
18 Flow length, L 00
19 Tt= L/ 36W*V
20 Watershed or subarea T, or T,
(Add Ttin steps 6,11 and 19)
U.S. Department of Agriculture
Natural Resources Conservation Service
Designed By: FGM, PE
Checked 8y: FGM, PE .
FL-ENG-21A
06/04.
Date: 4/12/2012
Date: _4/12/2012
6
u
O N F
o
in G
4
8 T
M C v
0.05
0
0.31
Q32.
TR 55 Worksheet 4': Graphical Peak Discharge.Method
Project: OldTraii Develo mentCreekside Iit-Phase It
Location: Creekside Subdivision
Cheek One, Present X Developed X
Designed By: FGM, PE
Checked By: FGM, PE,
Supplemental Water Quality Information
(Above minimum) required standards)
short Verslon limP Computations. For Workshaets1- 6
Albemarle:Gounly Wafer P.irotectlonOrdlnance ModifiedSlmpla Method
_Pfau: atd:rran,craekslrte iR=:P.fiaee:R Watere_ResourcesArea: OeieidpmsntAieax
PPrivarer FQM"P'E Date:_•_ 1ZApr-12
Project Orainage'Area Designation PA wn tub bLeasin
L. slomt pglkttant export in pound. L (Pti?j)Ft r1211 C(,Al2•tz.l
an RV meruroff coefrQ-14 t, Rv = 4:45 tA.449(f)
el sgiaff stcrm oWecifoNfa0Qr;A9
t peroontimpenicusnesis.
P annual precfpitatiod 4T to Albemarle
r -A -
or ....
A- profe0#area in acrys im:sublagtdraina9aorea, � .aka.
poliifantoon0antra0on, mg(I of ppm tatgef phosphoms
f •factor applied to RR
Y' fequiredlreetmedtWhunalncy, A,6"owrimperwarea =A(1l*P *4112jl27
Rft required On3o(ei, LOosif)-rxcipie)
"/9RR ramotel aftfenoy, P1?'t00fL(ppall
I..i nt+nu...rtw:..wuKzitt,w n.ei.,wt i.a rent A:'c a,'Ffnit
Rem
.. f •d4 velo went
Area
ask tleveldpment
Area
_ _�, ,
th width subtotal
itoadways _ µ
____ _ _
j Length Width gubtcl I
jRoad vays 1 825 8t
iL6
Sidewalks
t
Stdd aJfss 1,515 56T6
_-t0.3375
_
8F DatachadW'-' x' F'ootprigt na 'suCKkkN
Residences .(Residences
(includes walkways';, ram...
8F geEanhecf - Foot dot no. subtotal
520t1 57200'
'(includes walkways, -
ohes & driveways)
,4
_._...._
Tones & dd4ewa s
6,7i200
FadtibD Lots...',_..._
Rattdri -LotsY
p
........4.�a
0
Gravelareas Area
-
Ate.#+'-
x0Yr1
0
x0T0=
M..
0
.Gial;��)._._....
A idriPn BWetures.- x_xm..m,.. urea; no; sEll
.
ma 7-_ ubldttil
Strool res Ar?a_ no7 .
�At4a
0
1lli--
(7
AGb IY 9r ed pashw &
AtBa
ands and 0uitivated turf359gQ9;6� t 4 ff6='
3192Q.7C
( 83,PB4 x 0 (i8' _
22:1p0
_0 14 crop lend
_wa x a25
0
r ` ix
0
a
OR18r knperdpits;Aieas
IrtiperytaustJ.avar
t -
''= ara�a::*
Routine Method: storage -indication
2-year SCS 24-hour Storm
inflow (cfs) 7.364 at 12.04 (hrs)
discharge (cfs) 5.000 at 12.18 (hrs)
K-ENO-22C water level (ft) 701.583 at 12.28 (hrs)
06/04 storage (cY) 352.297
10-year SCS 24-hour Storm
inflow (cfs) 16.028 at 22.04 (hrs)
discharge (cfs) 8.811 at 22.20 (hrs)
water level (ft) 702.547. at 22.20 (hrs)
Date: 4/12/2012 storage (cy) 61g.592
Date: 4/12/2012 too -year SCS 24-hour Storm
inflow(cfs) 34.631at 12.04(hrs)
discharge (cfs) i5.198 at 12.26 (hrs)
water level (ft) 704.537at 12.26(hrs)
storage Icy) 1319.257
1. Data
Drainage Area
Description
Drainage Area
Description
Drainage Area
Description
Drainage Area
Description
Drainage Areal
Description
Drainage Area
Description
Drainage Area
Description
Drainage Area
Descri.ptiOn
BIOFILTER
(Proposed)
STR.83 & Ditch
Drainage Area (Am) in miles2=
0.0143
0.0060
Runoff curve number CN=
70.6
62,9
Time of concentration (Tc)=
0.31
0.32
Rainfall distribution type=
it
It
Pond and swamp areas spread
throu houtthewatershed=
3.8
0
15_19.FAfY ri"'Ifiiar.
2. Frequency -years
2 10
2 10
3. Rainfall, P (24 hour)- inches
3.7 5.6
3.7 5.6
4. Initial Abstraction, la -inches
0, 83 1 0,831
1:179 1,179
5. Compute la/P
0.22 0.15
0.52 0.21
6. unit peak discharge, Qu-csm/in
6W 650
550 us
7. Runoff, Qfrom Worksheet 2- Inches
1.17 2.55
.0 6, 190
8. Pond and Swamp adjustment factor, Fp
0,74 0.74
1 1
9. Peak Discharge, Qp- cfs
where QP=Qu Am Q F
Routed through
swM Faeillty
2.49 7.09
IfP(e)
RPRE)
Basin Input Data
Inflow Hydrographs
6 Contour Areas
3Inflow Hydrographs
Elevation(ft) Area(sf) Computed VoQcy)
Hydrograph o
700.00 4954-00 0.0
SCS
701.00 6336.00 208.5
name: 2-year SCS 24-hour Storm
702.00 7451.00 463.6
Area (acres) g.16o
704.00 10104.00 =11.3
CN 7o.600
706.00 12925.00 1962.7
Type 2
707.50 15226.00 2739.8
rainfall, P (in) 3.700
time ofconc. (hrs) 0.3100
Start_Elevation(ft) 700.00 Vol.(cy) 0.00
time increment (hrs) 0.0200
time limit (hrs) 30.000
3 Outlet Structures
fudge factor 0.74
Outlet structure o
routed true
Culvert
peak flow (cfs) 7.374
name: Barrel
peak time (hrs) 1z.o3g
multiple 1
volume (cy) 1o64.328
discharge out of riser
Olin) i5.000
Hydrograph)
h (in) o.000
SCS
Length (ft) 63.500
name: %o-year SCS 24-hour Storm
Slope 0.0050
Area (acres) 9.160
Manning'sn 0.020
CN 7o.600
Inlet coeff. Ke 0.500
Type 2
Equation constant set 3
rainfall, P (in) 5.600
Invert (ft) 694.000
time of cone. (hrs) 0.3100
time Increment (hrs) o.o2oo
Outlet structure 1
time limit (hrs) 30.000
Curve
fudge factor 0.74
name: 24" ADS Standard Grate Inlet Stage -Discharge Curve
routed true
multiple 1
peakflow(cfs) 16.o5o
Invert(ft) 702.100
peak time (hrs) 12.039
discharge into riser
volume(cy) 2316.420
file: twenty -four -ADS Grate Inlet.txt
Hydrograph z
Outlet structure 2
SCS
Culvert
name: Zoo -year SCS 24-hour Storm
name: Emergency Spillway
Area (acres) g.160
multiple 4
CN 7o.600
discharge through dam
Type 2
D (in) 15.000
rainfall, P (in) 9.1oo
h (in) 0.000
time of conc. (hrs) 0.3100
Length (ft) 20.000
time increment (hrs) o.o2oo
Slope 0.010
time limit (hrs) 30.000
Manning'sn 0.013
fudge factor 0.74
Inlet coeff. Ke 0.500
routed true
Equation constant set 3 -
peak flow (cfs) 34.678
Invert(ft) 704.750
peak time (hrs) 12.039
volume (cy) 5005.108
iCOTY R. rCOLLIM
Lie. No. 035791
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SHEET NO,
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