SW6100701_Supplement Form_20101011 (3)

Approved Stormlwater Permit Docurnionts
S' 1A ( o "1 O 1
Construsdion in accordance with these documents is Pia Na
required by the stormwater permit. North Carolina
ph beprondedbyoWol
rules require that the stormwater system designer
Inspect during construe ion; certify conformity with the
plans and specs; and certify compliance with the
stormwater rules. ( 15A NCAC 2H .1008 (j) )�
�Permit# sti(Ioc701 Datef•
ision oWaarC toe
'allyby_�
Shert #w4T flb^ �
ffRevision Date_1w
or�F wA r��o�
;
MCDEM 5r�•4�2b '
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
7hfs lam, mug be filled out: Armed and sudmdfed.
The Regf wed !lams Chad" (Pat uq must be printed, &W out and mhn, W aWV MiM ee of the +eq, iW ,i ffamabon
Proud name TraWN"Vaw
Cordatd person CJlrisk#w Rogm, Ern& F.nriai s. PA
Phone n rnber 919 894-TMS
Date 5MOW10
Dranage aee nm+ber 1
Sib Chowwristics
Drainage area
hnperimm area, postdeveloprtvrlt
% Impervious
Design rental! do*
Skwapa Volama: Won -SA wabrs
Minn m volume required
Volume provided
Stomps Yolurns: SA Waters
1.5' runoff volume
Pre -development 1-yr. 244r nmff
Posldevefopmenl1-yr.24a1rn e
Mirnmun volume rewired
Volkme provided
Peak Hour Cafcott dm
Is the prdpoet mnbd of the 1 yr 24hr storm peak flow required?
1-yr. 244 rairdaN depth
Rabonal C, predeveiopmert
Raton! C, poddevelWnert
Rak" irbrW.1-yr. 24-hr storm
Pie-0erdopment 1-yr, 24-hr peak for
Poddeveloprrrert 1-yr, 24-hr peak Iloa
Pre/Pad 1-yr. 24-hr peak now owwd
Ekwsgoa
Temporary pool elevation
Porrim nt pod olevadarl
SHWT elevation (apprm. at the perm. poet elevation)
Top Of 14111 vegetated shelf elftvbw
Bottom! of 10r vegetated shell elevation
Sehnert deanout, top devahm (baflofn of pod)
Sedirrrert dewoA batlan elevation
Sedmen t storage puinded
Is Itnin eddboral volume stared above the state -required to T. poor?
Elerdtion of the top of the additional volume
2,831.400 r+
UENR—•rK(D
1.439.860 fe
"
5D 85 in
inJUN
16 2011
1.0
120,000 1t9
oft fnwQ
510.482 1?
OK, volume provided is equal to or in exoess of whine regr M,
fe
13
rt'
fe
1
Y (YorN)
3.0 in
0.8b ()
0.64 (WHOM)
2.10 WY OK
47.78 r'ls%
44.03 r'hree
-3.75 f?/sK
177.00 fmsl
173.50 kcal
173.50 hmsl
174.00 firer
173.DD hlal
Data not needed br saldlation option #t, bid OK A provided.
170.50 his!
169.50 Mat
Data not needed br caln/ation option #1, but OK N prwided.
1.000
®EN R— FRO
Y (Y or N)
177.0 fmnf OK NOV 16 2010
Form Sw107-wet Deftnbon Br ai�Ray.&9r17" Pert! I.6 U. Dm gn may, POW 1 of 2

Permit No. I U U
(to A3 P'O-V G by DWO)
OL
surface
Areas Ao pool — - ' ' 161,488
Area REQUIRED, pemlanerd pool 84,942 If
SAIDAradio 3.001(unitless) 'r
Area PROVIDED, pcmraoent pool. A,—_ „ y ; _., : < 88,576 rt` OK
Area, bottom of 16R vegetated sJW, A,,1 ,,,, 79,311 fe
Area, sedinent deanout top elevebon (bottom of pond), Ab,,. 65,775 ff
Volumes
Vol-C, temporary pool 510.492 R' OK
Vdome, permarwo pool. V,,,,,yoy 358.070 R'
Vollerie, tomboy (sun o(forebM d more than one forehay) 71.704 R'
Forebay % of permanent pod volume 20.0% % OK
SAMA Table Data
Design TSS removal
Coastal SAIDA Table Used?
Mount mPiedmord SAIDA Table Usad'7
SAIDA ratio
Average depth (used in SAIDA table):
C*xdabon option 1 used? (See Figure 10-1b)
Vol—. permanent pod, Vr,,,,�
Area ppnded, permanent pod. dam
Average depth caialated
Average depth used in SA)DA, d., (Round to neared 0.51t)
Cdalabon option 2 used? (See Fgue 10-2b)
Area povided, Pint Pool. A -.—
Area, bottom of 10R vegetated shelf, Ah, ,,r .
Area, sediment clear" top elevation (bottom of pond). Ab,yq,a
90 %
n (Y(WN)
y (Y or N)
3.00 (u"iku)
y (Y or N)
358.070 IC'
88.576 R"
3.00 R OK
3.0 R OK
n (Y or N)
88,576 fe
79.311 f?
65,T75 fe
'Depth' (distanceblw bottom of N shelf and top of sedirnen!) 2.50 R
Average depth calalated e
Average depth used in SAIDA, d_ (Round fo nearest MR) R
O:awdaro GlctdadSoes
Drawdown through orifice?
00neter of orifice [d arc lar)
Area of orifice (if­rno i-dre r)
Coefficient of discharge (Co)
Driving head (Hj
Drawdown through weir/
Weir type
Coeficient of discharge (C )
Lengthof wet (L)
Driving head (H)
Pre-devekvrnerd 1-yr, 24-hr peak flow
PoMik)velopment 1-yr, 24-hr Peak Row
Storage volume d&harge rate (through discharge orifice or weir)
y_ (YorN)
5.00 in
W
0.60 (unitim)
1.59 R "
n (Y or N)
(u)
(writless}
rt
rt
47.78 R'lsm
6,30 ft Isec
1.66 felsec
Storage volume drawdown time
2.53 days
OK draws down in 2-5 days.
Additional Wdoarrtion
Vegetated sde slopes
3 :1
OK
Vegetated shelf slope
10 :1
OK
vegdatad shoo width
10.0 a
OK
Length of tlowpath 10 With ratio
7 :1
OK
Length to wi tl ratio
7.0 A
OK
Trash rack for overRow & orifice?
L _ (Y or N)
OK
Freeboard provided
1.5 R
OK
Vegetated filter provided?
n (Y or N)
OK
Recorded drarrage easement provided?
x' (Y or N)
OK
CaVm as n a at Otilrate buid out?
y_ (Y or N)
OK
Drain rnedw*wn for makftnance or emergencies is:
Form SW401-Wee Detenpm Bav>-Rev.&ar17169 Parts 1. 6 II. Design Surneriery. Pape 2 d2