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HomeMy WebLinkAboutSW1190201_PLTS-STORMWATER-C4-REV_7/12/2019J w z Q 0 I z� 0Q Q= :� �m 0 w� zQ Y 00 o Ln 06� m o� wO N w \ N 0 w 0 J n 0 v 0 n, w Q m 0 Cn Cn J m i Ln r� fi 0 EX MH#2 RIM=2569.73 W 8" INV=2564.48 OLD 79 & 23 N.C.S. R. 7523 .a AX-EA--B-JPOND-1 Area = 0.78 ac�-_, 5 = 0.46 ac @.35� + Area -A (4.7 ac) Total Pond DA = 5.48 ac yl WET POND WATERSHED BOUNDARY, TYPICAL. AREA -A TO POND-1 Area = 4.7 ac @.95 = 2.62 ac @.35 = 2.08 ac + Area-B (0.78) Total Pond DA = 5.48 2 ACCESS AND MAINTENANCE EASEMENT I TO BE SHOWN ON AS -BUILT PLAT FOR - R RECORDATION. /w _ IF WET POND WATERSHED BOUNDARY, TYPICAL. DRAINAGE AREA MAP SCALE: 1 " = 50' /w R - 25 0 50 SCALE IN FEET e iw 6' VEGETATIVE SHELF. 6:1 MAX SLOPE CONTINUOUS AROUND MAIN POOL. 1,500 SQFT. TOTAL. SEE PLANTING SCH. BELOW. VEGETATIVE SHELF PLANTING QUANTITY NAME SPECIFICATION 125 LOBELIA CARDINALIS QUART CONTAINERS, DENSE CARDINAL FLOWER & FULL, PLANTED 24" O.C. 125 RHYNCHOSPORA COLORATA QUART CONTAINERS, DENSE STARRUSH WHITETOP & FULL, PLANTED 24" O.C. 125 SACCHARUM BALDWINII ART CONTAINERS, DENSE NARROW PLUMEGRASS & ULL, PLANTED 24" O.C. b 0 MULCH SHELF AT TIME OF PLANTING WITH DBL. GROUND HARDWOOD BARK m \ AND PROVIDE ONE-TIME FERTILIZATION OF PLA TS USING 18-46-0 MAIN POOL RIP -RAP WEIR PROTECTION P.P.E. = 2561.00 SEE DETAIL BELOW SURFACE AREA=5,208 SQFT. BTM ELEV.=2556.50 CO-1, CONTROL OUTLET STRUCTURE. SEE DETAIL BELOW. 2557 C 2558 2559 2560 2563 2564 o M EMERGENCY SPILLWAY SEE o m DETAIL ON SHEET C3.3. A3 STABILIZE ALL BASIN SIDE SLOPES, ABOVE THE P.P.E. (2561.00) WITH SEED, AS SPECIFIED AND MAT, SC1508N, STAPLE PATTERN B, BY NORTH AMERICAN GREEN OR APPROVED EQUIVALENT. � Ssss 2ss�s 2563 256Ar 2565 6' VEGETATIVE SHELF. 6:1 MAX SLOPE CONTINUOUS AROUND MAIN POOL. 1,500 SQFT. TOTAL. SEE PLANTING SCH. ABOVE. ACCESS AND MAINTENANCE EASEMENT TO BE SHOWN ON AS -BUILT PLAT FOR RECORDATION. ENLARGED WET POND SCALE: 1 " = 10' 40.00' FOREBAY / SEDIMENT CHAMBER P.P.E = 2561.00 N N 5 0 10 SCALE IN FEET CO-1, OUTLET CONTROL STRUCTURE 12" DEPTH RIP -RAP to :!5= 6' VEGETATIVE W/ FRAME AND GRATE. SEE STILLING WEIR. d50=6" a SHELF. MAX STRUCTURE SCH. ON C2.5 2565 0 ° 2565 SLOPE 6:1 0 FE IM 4.00 to PROPOSED SURFACE. QUALITY CONTROL CALCULATIONS 3'MIN. LO _ _ _ _ _ _ _ _ _ _ _ EL. 2562.50 _ _ _ _ _ _ T_EM_P._P_00_L _EL. 2_56_2._50_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ INLET PIPE W/ RV = 0.05 + 0.9 X IA LO N a �� rn z EXISTING SURFACE L. 2561.00 EE PLAN PERM. POOL EL. 2561.00 EL. 2565 00 WHERE RV = RUNOFF COEFFICIENT (STORM RUNOFF (IN) / STORM N / RAINFALL (IN)), UNITLESS N -FOREBAY IA = IMPERVIOUS FRACTION (IMPERVIOUS PORTION OF DRAINAGE AREA 2560 � Z 2560 PRIMARY 24" HDPE 2 2 (AC) / DRAINAGE AREA (AC)) OUTLET PIPE 2 1 1 ro 2 PROPERTY AT BUILD-OUT:RV = 0.05 + 0.9 (3.08 / 5.48) 1 SEDIMENT STORAGE EL. 2557.00 SEDIMENT STORAGE EL. 2558.50 1 RV = 0.56 BTM. EL. 2556.50 EL. 2557.50 AND WQV = 3630 X RD X RV X A EL 2558.00 WHERE WQV = FILTRATION VOLUME (CUBIC FEET) RD = DESIGN STORM RAINFALL DEPTH (IN) 1.0 FOR CLYDE F OF " III A = WATERSHED AREA (AC) H54 DPE� 1-3/4" SCH. 40 TEE SECTION. OPEN 1.01 BOTTOM, PLUG TOP W/ NIPPLE INTO WATERSHED: WQV = 3630 X 1.00 X 0.56 X 5.48 2555 2555 STRUCTURE AT EL. 2561.00 WQV = 11,140 CF SECURE TO BOX AS NECESSARY. WET POND D E TA I L EXISTING SUBGRADE - - - - - - - - - SCALE: NOT TO SCALE STORMWATER MANAGEMENT CONSTRUCTION CONSTRUCTION SEQUENCE 1. CONVERSION OF THE SKIMMER BASIN TO THE WET POND SHOULD ONLY OCCUR DURING A PERIOD OF EXTEND DRY WEATHER WHEN THERE IS NO STANDING WATER IN THE SKIMMER BASIN. 2. STABILIZE ALL DISTURBED AREAS UPSTREAM OF THE WET POND. *WET POND SHOULD NOT BE CONSTRUCTED UNTIL FINAL PAVING AND LANDSCAPING IS COMPLETE. GENERALLY, IT SHOULD BE THE FINAL SITE CONSTRUCTION ACTIVITY THAT TAKES PLACE. ALL CONTRIBUTING AREAS WITHIN THE WATERSHED SHOULD BE STABLE AND APPROVED BY LANDSCAPE ARCHITECT.* 3. DIVERT PIPE AND CHANNEL RUNOFF FROM BASIN WORK AREA USING TEMPORARY PIPES AND DIVERSIONS, AS NECESSARY 4. THE WET POND IS A CONVERTED SEDIMENT BASIN. ALL OUTLET STRUCTURES AND PIPES SHOULD ALREADY BE IN -PLACE. 5. PROTECT BASIN SLOPES, EXCEPT AT SINGLE ACCESS POINT FOR EQUIPMENT. 6. PROTECT ACCESS ROUTE INTO BASIN WITH HEAVY-DUTY GEO-TECHNICAL FABRIC AND PLANKS IF NECESSARY. 7. INSTALL VEGETATION ON VEGETATIVE SHELF. 8. COMPLETE SLOPE STABILIZATION AND REPAIRS. 9. INSPECT BASIN AFTER SEVERAL RAIN EVENTS TO VERIFY IF IT IS FUNCTIONING EFFECTIVELY; IF IT IS NOT, MAKE REPAIRS. CRITERIA THAT THE BASIN IS WORKING PROPERLY SHALL INCLUDE BUT NOT BE LIMITED TO, NO WEEPING FROM EARTHEN DIKES, PROPER DEWATERING TIME AS PRESCRIBED BY DEQ ON THIS SHEET, AND NO EXCESSIVE SEDIMENTATION DEPOSITION. DRAINAGE / ACCESS / INSPECTION EASEMENTS ARE REQUIRED FOR ALL STORMWATER MANAGEMENT FACILITIES. IN ADDITION TO AS -BUILT SURVEYS. EASEMENTS CONNECTING TO PUBLIC RIGHTS OF WAY SHALL BE SHOWN FOR THE WET POND. AS -BUILT SURVEYS SHALL BE SUBMITTED TO THE LANDSCAPE ARCHITECT AT CLOSE-OUT FOR REVIEW AND CERTIFICATION. WET POND SIZING CALCULATIONS AVERAGE DEPTH D avg = VOLUME OF MAIN POOL / SURFACE AREA 16,741 CF / 5,208 SF SA = DRAINAGE AREA (SF) X SA/DA RATIO / 100 238,709 SF X 2.09 (60% IMPERVIOUS FOR 3' D avg) _ 498,901 / 100 = 4.989 SF AS DESIGNED, THE MAIN POOL HAS A SURFACE AREA OF 5,208 AT ELEVATION 2561.00 AND A MAIN POOL CAPACITY OF 16,741 CF AT 4' DEPTH. FOREBAY 15%-20% OF MAIN POOL VOLUME = 2,511 CF - 3,348 CF 4,243 CF PROVIDED BETWEEN EL. 2558.5 & 2561.0 2550 -0+ 1®+00 1610 to] Weill II a 0+60 � n %11 m u z z O Cn w z :�i 0- w :�i oo� O U � O w U 3: 0 3: w_ > w w w o LLJ O 3: a_:5i �O W Cn \ \ LLJ 00 Q O N 0 �Ln N W 0 0 N N U Zo E � � o � N U � - a z6, Y d � N Ln 00 W Qi O E- 04 �M_0 IT Up w Z �- E- I1 z W U U Cn CD w 0 W z z ISSUED FOR: DATE: BY: J REVIEW 02/25/19 RDH w APPROVAL 05/21/19 RDH APPROVAL 07/08/19 RDH = U c� c� z CD J JOB NO. Cj LCU2001 .02A Q SHEET CD E C4.0 0