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Home My WebLink AboutSW5240601_Plansheet - Existing Drainage Area_20240617 � \\ /� IIII ` �:\✓ 1\ I 1 1 I 111=II \\ X1111 G, / STORMWATER QUALITY CALCULATIONS \ I"7-ADMINISTRATION/DORMS - - -- I IEXISTING PRE-1997 IMPERVIOUS SURFACE AREA = 4.02 AC \ 1 25TORVBRICK \ \ G7 /\ � /L EXISTING PRE-1997 IMPERVIOUS SURFACE AREA TO BE DEMOLISHED = 2.89 AC w , \ o \J T / a � , \ ILU \ GRA I E \ \ ASPM�L T PARKING \ I\ L/ / \ /_ _ \ \ , I `- \ EXISTING POST_1997 IMPERVIOUS SURFACE AREA = 0.53 AC - m Q a = _ ��.� 1/ \ I 1 \ \ �\ DlS _ _ j\ ASPHALTPARKING /�L \ \ �-\ x JI EXISTING POST 1997 IMPERVIOUS SURFACE AREA TO BE DEMOLISHED 0.49 ACI I \ \ \ / NI 1 I� DEPARTMENT OF PUBLIC SAFETY o z \ \ ,` _ 1 / \ \ /3 ° \ \ \ I \ I Tv GEN 1\ y��J,, \ Y �\\ I \\ III I III NEW IMPERVIOUS SURFACE AREA = 7.82 AC O \ \ \ \ / I \ \ \\ \ I --J�\ r" \ �� - -UGp N I I I CO o \\ `\ - „ I _ _ - / \ 1 1 / I \ ` \ \ �\ \ \ - �� \ II - �- / I M 1 IMPERVIOUS SURFACE AREA TREATED WITH WET POND = 7.25 AC CENTRAL ENGINEERING z w \ / I 7 / 1 \ I n \ \ �- \ �} I' �A/ It / 3`/e` _ T- �� -1 I I - \ N I I I I IMPERVIOUS SURFACE AREA REQUIRED TO BE TREATED = 4.97 AC LU - - 3 _ �Tl///l71771ii� I I I ( I I I EXCESS IMPERVIOUS SURFACE AREA CAPTURED BY SCM = 2.28 AC \ \ \ 3 JO�`� �j<' / I � � \•�I III I SIGN II \ p I I I Plan * Design . Construct Oi JGQ 8-CAFETERIA,, 52.47 ' r _ \ �� II III I I I I PRE-DEVELOPMENT STORMWATER QUANTITY CONTROL \�� r - - / � -38 / L=2 .04' s ° Q� , _I \� I : III I , NC Department \ \ \ sr \ \ - I DRAINAGE E - - -- _/ \ \ _ \ \ \ "' � � CLASSR °♦6' \ _ - �/ .s= ■ ■ I i I I I AREA CURVE Q1 Q10 Q100 \ \ \ _ /77% / /Tll I� STORYB O I/ PRE-DEVELOPMENT= \ \ _ \ \ \\ \ \\ \f \ I \� I I I NUMBER of Public Safety/ � \ �� \ � ■� ( � � � i 'I I v I C (Acres) .7 0-SHP / 1L/LLLv, /- - 3' ' x GVM/MEDICAL" �_ - oI - ---- ° �� ' \ \ \ 8�16 34 I M -UCATV} _ I II STORYBRICK // \ \ \ \\ \ \ \ m .P- / r I �� / \ UCATV ANALYSIS POINT A 9.83 74 5.01 16.06 30.57 HH T tip�1/F(7- / -UCATV- 7 - III \ / III ANALYSIS POINT B 3.38 14 2.05 6.52 12.41 / �? \ P \ 10 � - w- NOTE: POST-DEVELOPMENT FLOW IS LESS THAN PRE-DEVELOPMENT FLOW AT ALL ANALYSIS POINTS. S I OFORTH - - _ _ _ - - _ �/�\ \ \� I REFER TO CALCULATION BOOKLET FOR ADDITIONAL INFORMATION. -'� / 1 I � x x X o 2 3 ' 5.50 168.3 ' 2 W III I PRE-DEVELOPMENT IMPERVIOUS AREA AND WATER QUALITY TREATMENT UGP- 1/� - ♦ - rr� �i� GP-R- \ \\ Pv`-00 \ \ �- I i TANK11 I I- ■ \ �, I J 1 \ o S87 16 29 W / o L= 67 /.� ■ III \ \ \ \ \ \ \ \ �� \- - - I I I ■ 1 1 a ♦ I:::::::::::::: N cs� 26.10 II IMPERVIOUS ADDED BEFORE 1997 7JANK -I y I I I �- UGP- - - --_ -UGP TO REMAIN 1 13 ACRES \ _ lDl9 -_ ✓ _ = - - _\ - _��D „/�T/f - /7//��Jls/S� ■ I I I I J ■- I� IMPERVIOUS ADDED AFTER 1997 7$2Sjro 7 _ - \ TO REMAIN (0.04 ACRES) J1404\E TRYO Rj7r� _ _= \\° �/ \ BR�Ky 'I I I Q � Q Q IJ L // I I _ I u l^ _ \ / _i I �\13522\ ARNE RD ^/ QHT_ \ P- - WQG�` , , ■ r / I GRAVEL II 6' Wiz,,_- _ F� ///////// ■ I I I I I / 434 FAYETTEVILLE STREET SUITE 1700 d _ _ ■ I TO DEMOLISHED (2.89 0 ACRES) RALEIGH, NORTH CAROLINA 27601 �w-------RD--- ANALYSIS POINT B _ I �� -UGP- - GT-UGP- � - - ` T- I `\ / I I TEL. 919.829.2700 FAX. 919.829.2730 8" ANC / J / i' I1� \\ II /��/ ,I/ / ;. z- ��UGP - - - U P-N ■ \r IMPERVIOUS ADDED AFTER 1997 WWW.LS3P.COM I III 1 - SAN f- �\ � �` 1 I / � I I 8"SAN_ / SAN `� - �- sHEo/ l �` / r 1 I o I - \ \ \ �. ■ I TO BE DEMOLISHED 0.49 ACRES \N887 32 31 E \ 'rr I- I�_♦ I I , j / _ /'+ _ --/ d __ I -� / / I / / . ■, . 11�8 17' - - �+ N -56.18' „E _ < // / x x �'L=60.39'/� 2 t I "14-SBIGYM" J ) t� �I --- �� ---- `-- _ 3STORV l / DRAINAGE AREA \ 1 ■ / I TIMMONS GROUP / i \ CO \ T ENGINEERING DESIGN TECHNOLOGY /3 / I I \ CN �i I \ I I� I NC LICENSE NUMBER C-1652 ) I I I h I TIME OF CONCENTRATION FLOW LINE p N `n \ Timmons Group _ _ _ _ /�/�/�/ �-' �y ,' _ `\ / ■ II Attn: Frank Slinsk PE 10' SETBACK I III III Y, w / / ■ / ° I 5410 Trinity Road; Suite 102 ww \\ \ I DYSH 50.6 ' / - TIME OF \ \ R-50.00 1 ',I" - I I\ I I 1 M Raleigh, NC 27607 �- - - - ■ �I 35 / // �- \ L=43.26 - - � /- � ' 3- � CONCENTRATION � ' I \ \ / ,' I III ( ) /r�'/ � / \ (, I TOTAL SITE AREA= 665,666 SF 15.29 AC Phone: 919.866.4505 -- _��-- 3 / / '/��/ \ / GP- �� =t1Gp'-x ��r - - \ \322- ��`�` / \ ,32$ - _ _ - 333�� P� / � LINE AREA B j� -G Fax: 919.859.5663 D ---- -_ _ - \ / °S�j �� j �/ / - _ - ASPHALTPARKING - 334�- / / `3 ` / \ FOR REVIEW ONLY - - - - , ' _ - / g � , , - 0- �- - - - _ _, :• � -� � /' � �� °' � � � i I\ IIII /�I I _ - / / /�� / \ - - - - - - - - / 33 -� i� // 3� p,'� nS h / \ ♦' J \ I / NOT FOR CONSTRUCTION / // �S c�j I \ R=50.00 r�J 1 \ / � _ F °d _ _ 33�l / /j i // UC' �. 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