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POST -DEVELOPMENT STORMWATER QUALITY CONTROL PRE -DEVELOPMENT ONSITE IMPERVIOUS SURFACES = 5.41 t ACRES POST-DEVELOP'MENT ONSITE IMPERVIOUS SURFACES 18.45 ± ACRES (INCLUDING FUTURE BUILDOUT) IMPERVIOUS AREA REOWRED TO BE TREATED = 14,68 ACRES IMPERVIOUS AREA TO BE TREATED = 13.09 ± ACRES (WET DETENTION A) IMPERVIOUS AREA TO BE TREATED = 176 ± ACRES (WET DETENTION B) TOTAL TREATED IMPERVIOUS = 16.85 ± ACRES (A+B) IMPERVIOUS AREA OVER -TREATED = 2,17 ± ACRES, POST -DEVELOPMENT STORMWATER QUANTITY CONTROL ANALYSIS POINT A AREA (CN) al Q10 Q100 (Ac,res) POST -DEVELOPMENT 17.13 92 23.16 42.85 47�56 Al (WET POND?�) POST -DEVELOPMENT 14.;?'U b4 U.B3 bZJU '142�92 A2(BYPASS) J POST -DEVELOPMENT 31,33 45,69 12131 1K95 A1+A .... .... ................... - ............. ANALYSIS POINT B ................ I'll ... .......... ............... ............. ....... ...... I'll, .................... POST -DEVELOPMENT 4�63 93 2�80 �6,87 32A4 B1 WE P ND B POST -DEVELOPMENT 26,15 80 40,8,0 105�62 185.52 @yP8S§, "I',"", ......................................................................................................... .................................................................................................................... POST-DEVELO MEN 30,78 43�56 112,49 2 1100TAm- 121111, NOTE� POST -DEVELOPMENT FLOWS ARE LESS THAN PRE -DEVELOPMENT FLOW FOR THE 1 -YEAR AND 10 YEAR STORM EVENT AT ALL ANALYSIS POINTS,. REFER, TO CALCULATION BOOKLET FOR ADDITIONAL fNFORMATION. POST�-DEVELOPMENT IMPERVIOUS AREA AND WATER QUALITY TREATMENT 1, VIN IN, EXISTING IMPERVIOUS TO REMAIN (BYPASS) POST -DEVELOPMENT IMPERVIOUS TREATED IN SCM 1=NU=;M1=V1U91i W$942920 BOA TYPE DRA�NAGE AREA Al DRAINAGE AREA B1 PROJECT AREA ON -SITE BUILDINGS (SF) 64,267 2,219 (EXISTING) 66,486 ON -SITE PARKING (SF) 465,306 61,6,57 526,936 ON -SITE SIDEWALKS (SF) 33,389 0 3�3,389 TOTAL IMPERVIOUS (SF) EAL D:RAINAGE AREA, (SF) 570,010 746,327 .. .. .. .. .. J201,683 '163,786 733,796 948,010 THIS DRAWING IS FOR AGENCY REVIEW ONLY - NOT FOR CONSTRUCTION f 'I d V;/h z';�;i;z. W;A %. . . . . . IV/ . . . !� // ljq"�', I I VI A IN AIIVV� I V` iiN /Z Vlt� i,i 10 *4%, . ....... . (V6 A % 1V .............. ........... 1,8 w -:z, '71 V, I'l ""Now i �-rl5fl _6= . .......... . d A.......... 77. . ..... x " 1000w qkl oppow" in 'A anwhow o-N"Mong" n ,) , �." 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A IN 1 07 '7, AREA OF MAJOR, . ... .... . ... it i,� D M01 IFICATIONTO . . .. ... . .... X X MIT . ... .... . V,, TORMWATER PER -7�77----7 7 �H . . ... ... .. . . . .. .. . . . . B 2 A >N 7 . ............... .............. . 4 . . ....... . .. . .... NN . ......... f . . .. . ............ . . . ... .. ... 7 ti f _J SHEET C4,.9 SEE �INSETC . ..... ..... -7 II", . .. . ... ........ A gg 116 P ///M/,V�,/////// INAN/a/7110 7-* 4 K "z. x, Y, ................. 1b K, f ....... .. . X, X, 1XV, XV XxIc", X", N Ne, x I I f IN VA, X, x, SCALE 1 '1=60' X, VIKI VI, X,/, ,< x,�jx,� 'X" > X /N >I 4pF 1129�� . . . . ....... 7 60, "K 77,7= 7,7 im, lK, K INSET 'A' 77,77,7,l� �7; I AsNfe"Nipt `C oo//,�"_ x "Ie. K �!V."`V)V,��;, ��`I I IN" . .. ....... E r'4 VIP IV,) Ln r,4 00 or.) r4 �h A M CL VJ RI Ni 0, U'l CIO, M �v U I,- 0 1 " co U) U 6 Z.4 0 LL 0 x C-14 r_ M U) Ir 0, U,_ NOT FOR CONSTRUCTION 0%SS11111""A .1k 0,33612, SD/DD REVIEW LL] z z 0 e wi N.-W z %*4-00 ^Ao LL_ LLJ z < LU Q r r% IP rA U) LU c 0 Z Z 40 Lo o Lo LLJ 0 ^100 LL z j z z z 0 z 0 0 CAI 5.- ^,00 M 'T- 0 LL 0 LLJ _c OL A%,o LEN ED z 0 > Q < LL cy) Wi c 0 Z Z < (o U Z 00 U) LL zm Lo 0 0 CL C) _j U-) V-1 W �� Lo RevisOns No� Date COR #27 2021 JULY 09 SVVR # 1 2,021 AU�G 13 Project Number: 171 1-B Date: 2021 AUG 13 Drawn by� FS POST -DEVELOPMENT STORMWATER MANAGEMENT PLAN She!el Number I INSETU] PRE-DEVE,LOPMENT STORMWATER QUANTITY CONTROL POST,-DEV'ELOPMENT STORMWATER QUALITY CONTROL DRAINAGE PRE -DEVELOPMENT AREA (CN) Ql Q10 Q100 (Acres) ANALYSIS, POINT A 26.38 8�5 1 76.00 171.35 283.62 ANALYSIS POINT B 28.27 80 144.18 200.56 ANALYS,IS POINT C T25 78 17,85 32,31 NOTE: POST-DEVELOPM E NTF LOW IS LESSTHAN PRE -DEVELOPMENT FLOW AT, ALL ANALYSIS POINTS. REFER TO CALCULATION BOOKLET FOR ADDITIONAL INFORMATION. PRE-DEVE,LOPMENT IMPERVIOUS AREA AND WATER QUALITY TREATMENT i , �l T/z 60111,29 My *kvj Kim DRAINAGE AREA PRE -DEVELOPMENT ONSITE IMPERVIOUS SURFACES = 5.41 ± ACRES POST -DEVELOPMENT ONSITE IMPERVIOUS SURFACES = 18,45 +- ACRES (INCLUDING FUTURE BUILDOUT) IMPERVIOUS AREA TO BE TREATED = 13.09 1 ACRES ('WET DETENTIONA) IMPERVIOUS AREA TO BE TREATED = 3.7'6 ± ACRES (WET DETENTION B) TOTAL TREATED �MPERVIOUS = 16,85 * ACRES (A+B) THIS DRAWING IS FOR AGENCY REVIEW ONLY - NOT FOR CONSTRUCTION *WETLANDS IN THE PROJECTAREA HAVE BEEN IDENTIFIED AND CONFIRMED BY ACOE AND NCDEQ. NO IMPACTS ARE PROPOSED. I INSET'C' I POST -DEVELOPMENT STORMWATER QUANTITY CONTROL DRAINAGE ANALYSIS POINT A AREA (CN) 01 010 01001 (Acres) POST -DEVELOPMENT 17.13 92 2116 42.85, 47.56 Al (WET POND A), I POST -DEVELOPMENT 14.20 84 32.83 8,2.30 142.,92 A2(BYPASS) � POST -DEVELOPMENT 31.33 45.69 1213.31 186.95 Al+A2 (COMBINED) ........ . ...... ................. . ................................... ANALYSIS POINT B ........... ................................................................................................................... POST -DEVELOPMENT 4�63 I 93 2�80 6�87 32,,44 Bl (WET POND B) �POST -DEVELOPMENT 26A5 80 40.80 105.62 185�52 a?_�BYPASS) �POST -DEVELOPMENT .78 43.56 112.49 215.84 131+132 (COMBINED) __f_ NOTE: POST-VEVELOPMENT FLOWS ARE LESS THAN PRE -DEVELOPMENT FLOW FOR THE 1 -YEAR AND 10 YEAR STORM EVENT AT ALL ANALYSIS PQNTS, REFER TO CALCULATION BOOKLET FOR ADDITIONAL INFORMATION, POST -DEVELOPMENT IMPERVIOUS AREA, AND WATER QUIALITYTREATMENT "K x EXISTING IMPERVIOUS TO REMAIN (BYPASS) IPROPOSED WPERVIOUS (BYPASS) POST -DEVELOPMENT IMPERVIOUS TREATED IN SCM DRAINAGE AREA BASIN INFORMATION BUA TYPE DRAINAGE AREA Al DRAINAGE AREA BI PROJECT AREA ON-S,ITE BUILDINGS (S�F) 64,267 2,219, (EXISTING) 66,486 ON -SITE PARKING (SF') 465,306 61,657 526,936 ON-S,ITE SIDEWALKS (SF) 33,389 o 33,,389 FUTURE (SF) 7,048 94,865 (PVMT.) 101,913 TOTAL IMPERVIOUS (SF) 570,010 163,786 73,3,796 TOTAL DRAINAGE AREA (SF) 7416 � 3 27 948,010 E 0 0 J > z Ln 0 r,4 06 or.) M CL U c CL Ni Lo 0, ui LU CL U) 5 z Z V) M �o E- 0 �- � o ui 6) 0: IN Co en 2�,Q 6 Z Z LJI r -r cn, 0 LL F- w E o a �� Fz , 0 z UN) 0� 0-1 um� NOT FOR CONSTRUCTION - ollilliffitro, %.to J�k C % Ro z S,EAL 0,33612, S I li It 0" SD/DD REVIEW LLJ z z 0 e wi N.-W z %*4-00 ^Ao LL_ LLJ Z < LLJ :) Q r 117% IP rA W C Z Z .2 0 o Lo Lo ZZ CD U) 00 LLJ C: (N 0 rto Z LL j z z C�l z 0 z C r%j — 0 (1) 14. Cn 0 0 w F— LL z 0 > 5 < LL cy) wl C: 0 Z z U) (o 0 Z cl) LL ztt 0 0 0 Lo CL C) U) L0 RevisiOns Na Date COIR #27 2021 JULY 09 SWR ffl 2,021 AU�G 13 ................................................................. 11 ............ Project Number: 1711 -B a e: Drawn by� FS PRE & PlOST-DEVELOPMENT ST'ORMWATER ............... MAMAG EM �E,N I ELAN— She!el Number C419