20070348 Ver 2_Site Plan_20070319

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IMPACT #1
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W ' p ROAD T #2 ~ 11 ~ ~ o 01 m UNE LENGTH -BEARING
N01°sa~a,~e SEE DETAIL. O 281.58' S01.38'33'W 882.70' L1 61.01 N77°3T18"W L2 78.85 S77°52'40"W
L3 89.08 3W°48'08'1M
~ ~ 15,~,~ 30'41J PROPOSED GRAVEL DRIVE ~ n t0 - - 6+00 17+ es +00 + ~~..~_._-~_--f----f-~ _--~-~_-~'81~~---~---~-I ~ } Zi~$ ~ w 21+ 2 +00 L4 177.32 S44°27'01'W 7,
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SOt°13'11°W % ~ 3~. CONTACT ONE-CALL CENTER ~ t-800.632-4949
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Nos°os~2o^E FLOOD 20NE "AE" PER FEMA F.I.R.M. NO.3720094800J 8 aw:6-100w5a
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CA _ ~ Ripe Sizin~'I~U+~rksheet ~ _ STREAMS AND WETLANDS IMPACTS TABLE
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STREAM MEANDER
IMPACT STREAM TYPE: LENGTH: CONSTRUCTION: '(k The estimateddesi~discharge{cfs) ~ PERENNIAL STREAM 901E ROAD/CULVERT/RIPRAP W w
~ ! C = Th e compos ite runoff coefrie ient for the watershed ~ 2 INTERMITTENT STREAM 54 LF ROAD/CULVERT/RIPRAP t9 ~
GIN INTERMITTENT v'~ I(25) = R~nf~i int~sity (mlhr) forthe designated return period and time of concentration z w
--"""'"-'LL ST M PER NCDWQ 3 \ (FEATURE B" -FLAG "B1") \ E PTPE #1 \ ~ - 1--v i- N O~C1
..n i fl =Watershed area (aC.) i _ _ TOTAL LAND DISTURBANCE = 3.59 AC. L2. 4
64 LF OF 48" CMP @ 1.83°~ NIPS PIPE #2 lY OG U ; Li. " y Q. txl Q--) 05- v-1 ('49o
INV. IN =488.80' EX• PEREN ~LF OF 30" CMP @ 4. ° °o C Estimate C based an watershed content and soil type frwn ~-v~ ~ .THE GONTRACTOR MUST LIMIT STREAM DISTURBANCE AND
INV. OUT =487.63' i, STREW INV. IN =485.10' + f___ Table 2 Rational Forumla C Vdues. (C= 0.35 is a common estimate) EMBED STREAM CULVERTS ACCORDING TO THESE PLANS. IF
0/ ~ INV.OI(T=48222' a STREAMS ARE IMPACTED BEYOND WHAT IS SHOWN, THEN
PIPE'~1 \ ~ I(25) Find tc = (L^3fHj ^.385 tc =Time of concentration THE PROJECT MAYBE SUBJECT TO BIG MITIGATION FEES 101,
r-' L = Hyd'eUliG 12t1gth Qf the Wet~h~l (ft.} FROM NCDWQ AND(OR USACE.
_ 128 _~H = The ~e~i~ change the w~ershed (ft.J THE CULVERT MUST BE EMBEDDED BELOW THE STREAM awe 4i SEAS.
~ Use tc to find rainfall intensity (inihr} fran ~aph. ~ CHANNEL, TO AGLOW AQUATIC LIFE PASSAGE. MIN.
PERENNIAL STREAM {FEATURE "A") PER / ~ 'NeMer use tc< 5 min ~ `f i _ EMBEDDED DEPTHS ARE AS FOLLOWS: s+ C~ AIM
A Calculate tots area of w~ershed CULVERT DIAMETER: MINIMUM EMBEDDED DEPTH:
'~-66ASS RIP RAP r "Variables are REd" _ 18" QR LESS o.3' _ 24" 0.4'
CHANNELLI G
/ /CLASS 8 RIP P / ~.--1`` 15'l x 7.5'W x 18'"fh Gina 1 Pi~--' 30 0.5' ~ wv ~ 36" 0.6'
CHANNEL MG N o tt9
24'L x 1 x 18"Th ~ + N Cv
~ ~ 48" 0.8' C= Q.23 L= 1}00 ft G! 0.19 L= 745 ft 64" OR GREATER 9.0'
~ / y i(2a~}= 7.8 in hr H= 41 S I(25~='~ 8.5 in hr H=~ 39 ft LO
A= 20 ac tc= 8.06, min A=, 9.25 ac tc= 3.96 min IMPERVIOUS DATA:
QC2~' 35.88 cfs ~ Q(2Sj~ 74.819 cfs 1,1.1 co m
EXISTING IMPERVIOUS AREA: n/a e~ x
{10j= 6.5 Calculate C Local C ~ I{10}=i ~7.5 Calculate C Loci G ~~STING IMPERVIOUS COVERAGE: 0"/0 U- E
Q(10~ 29.90 % PePd2d 1 0.95 Q{70p 12.9'+ °!o PS~1 1 0.95 PROPOSED IMPERVIOUS AREA IN ROADS: 1.26 AC 8
IMPACT #1-DETAIL IMPACT ~#2-DETAIL I(50)= 8.5 ~ Lawn 29 0.35 I(50)=r 9.25 % 1.81A?1 ~ ANTICIPATED IMPERVIOUS AREA IN GRAVEL PAD: 1.09 AC
Q~0}~ _ 39.10 °6 Pasture 0 0.30 Q(bOp~ _16.98 °,6 Pasture 0 0.30 TOTAL ANTICIPATED IMPERVIOUS COVERAGE: 2.35 AC t 15.00 AC (16 °/a) OM M M
HORIZ.: 1" = 20' HORIZ.: 1" = 20' I(100}= 9.25 % VYoaded . 70 0.17 ?{1~}= 9.9 °k Wooded 94 0.17 VLO&
Q{100} 4'1.bfi _ __f _ TOTAL--_._._ ~ _ Q{~~}° I ~7.11~-- TOTAI.~_ 0.19 NOTES: N0.) Lo 4~U ~
LO P N7 LE = 4 .71 ~T
VI TA 14+ 02 I S A = 0+ .pq Pipe Size {in} = q8" ~ Pipe Size (in) = 30" 1. THIS PROPERTY IS LOCATED IN THE ROANOKE RIVER BASIN AND AN OEM
PVI LE =4 .37 H'W!D = 0.63 - Z 0~M <0 1 -00
A . = 5.3 HWID = 0.?5 UNREGULATED WATERSHED.
K= 24 =1 •05 irn~. In = A88.~ Irrv. in = 4$5.10 q,a
.-U0. 'V ~enteriine Irv. = 488.32 Centerline (rnt. = 483.50 2• THIS PROPERTY IS LOCATED IN FLOOD ZONE "X" AND "AE" PER FEMA
(nY Out ~ 487 B3 ~~V - 4$2 22 FIRM NO.3720094800) & 372009390W DATED 7-25-06 (PRELIM).
h' r Length {ft) = Bd Lenr~h (ft) = i2 t tL ~ 1 1
Slope = 4.00°l0
I e N CJ o 'M C$ ~h V(10) 17.22 V(10) = T8
M ~r + a~i Apron Size (lxW?4-i) = 247112X18" Apron Size (lxW)G-i) = 15k7.5x18" fir./
Stone size (n.) = g•• - Stale Sizs (in.) = 6" 0
m ~ ~5 ~s ! Thickness (in) = 18" Thickness (in) = 18 C
m Type Rip Rap = Class b Type Rip Rap = class b
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TREE PROTECTION FENCE (OUTSIDE OF CHANNEL) mz
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96 TREE PROTECTION: FENCE 00,
rnix (OUTSIDE OF CHANNEL)
c~ 94- RIPRAP APRON MUST CONFORM V
DO NOT TO EXISTING CHANNEL AT END 0
~ DISTURB OF APRON, SO THAT NO GRADING BEYOND IS NEEDED BEYOND THE APRON.
FENCE. EMBEDDED DEPTH DO NOT CJ C) c z
RIPRAP APRON DISTURB CU w
BEYOND
FENCE. NOT TO SCALE. 0 w z CL
~ SEE PLANS FOR ADDITIONAL INFORMATION. ~ - j-- w =
64 O 48" MP 1. 3% I I 0 8 CULVERT LENGTH RIPRAP LENGTH MAR ~ ZO47 Z 00 z
INV. OU = W.63' PIPE #2 20'
-41 72 LF OF 30" ° CMP @ 4.QQ /a I INV. IN = 485.10'
INV. OUT w 4132.22' TOTAL STREAM CHANNEL MEANDER DISTURBANCE LENGTH 1 y~q~iWD 6tt;vYATEkER -ico LL. WW <w Lp,
cn " w p M ~ Ci ~ - w w H
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rn °~rn v ~ a ~0 PROJECT NO.
13+00 14+00 15+00 rr ®6-392R
21+00 22+00 DRAWING NO.
IMPACT #1 -DETAIL.,
IMPACT #2-DETAIL 06-392R.dwg
LSHEET4 OF 5
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06-392R Piedmont Electric
Pipe Sizing Worksheet
Q(25)=C*1(25)`'A
Q= The estimated design discharge (cfs)
C = The composite runoff coefficient for the watershed
1(25) = Rainfall intensity (in/hr) for the designated return period and time of concentration
A = Watershed area (ac.)
C => Estimate C based on watershed content and soil type from
Table 2: Rational Forumla C Values. (C = 0.35 is a common estimate)
1(25) => Find tc = [L^3/H] ^.385 tc = Time of concentration
--------- _____ L = Hydraulic length of the watershed (ft.)
128 H = The elevation change of the watershed (ft.)
Use tc to find rainfall intensity (in/hr) from graph.
"Never use tc< 5 min
A => Calculate total area of watershed
Wariables are RED"
Pipe 1
C= 0.23 L= 1400 ft
1(25)= 7.8 in hr H= 41 ft
A= 20 ac tc= 8.05 m in
Q(25)= 35.88 cfs
1(10)= 6.5 Calculate C Local C
Q(10)= 29.90 % Paved 1 0.95
1(50)= 8.5 % Lawn 29 0.35
Q(50)= 39.10 % Pasture 0 0.30
I(100)= 9.25 % Wooded 70 0.17
Q(100)= 42.55 TOTAL= 0.23
Pipe 2
C= 0.19 L= 745 ft
1(25)= 8.5 in hr H= 39 ft
A= 9.25 ac tc= 3.96 min
Q(25)= 14.69 cfs
1(10)= 7.5 Calculate C Local C
Q(10)= 12.96 % Paved 1 0.95
1(50)= 9.25 % Lawn 5 0.35
Q(50)= 15.98 % Pasture 0 0.30
1(100)= 9.9 % Wooded 94 0.17
Q000)= 17.11 TOTAL= 0.19
Pipe Size (in) = 48"
HW/D = 0.63
Inv. In = 488.80
Centerline inv. = 488.32
Inv. Out = 487.63
Length (ft) = 64
Slope = 1.83%
V(10) = 7.22
Apron Size (LxWXH) = 24'X12'X18"
Stone Size (in.) = 6"
Thickness (in) = 18"
Type Rip Rap = Class b
Pipe Size (in) = 30"
HW/D = 0.75
Inv. In = 485.10
Centerline Inv. = 483.50
Inv. Out = 482.22
Length (ft) = 72
Slope = 4.00%
V(10) = 7.8
Apron Size (LxWXH) = 15'x7.5'x18"
Stone Size (in.) = 6"
Thickness (in) = 18"
Type Rip Rap = class b
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