CATCHMENT 1: WILLOWS ROCK STACK CONTACT WATER CATCHMENT 3: SFA CATCHMENT 4: VPRE= 6,135 m3 PEAK Q= 1.1 m3/s VPRE= 13,715 m3 PEAK Q= 2.4 m3/s VPRE= 8,150 m3 PEAK Q= 1.4 m3/s TOTAL VPRE= 117,830 m3 PEAK Q= 1.36 m3/s VPOST= 14,070 m3 PEAK Q= 2.6 m3/s VPOST= 6,600 m3 PEAK Q= 1.4 m3/s VPOST= 8,310 m3 PEAK Q= 1.6 m3/s WAIHI MINE TREATMENT PLANT DEVELOPED SCENARIO 10year - 24hr EXISTING SCENARIO 10year - 24hr EXISTING WETLAND/MATAURA STREAM/NEW WETLAND NOTE FINAL DISTRIBUTION OF PREDEVELOPMENT FLOWS BACK TO THE RECEIVING ENVIRONMENT TO BE CONFIRMED DURING DETAILED DESIGN. TREATMENT/ATTENUATION (FOR 100YEAR ATTENUATION) COLLECTION POND V = 19,000 m3 PRE-DEV FLOW RATES FOR 2, 10 AND 100-YR STORMS WUG SURFACE FACILITIES AREA: STORMWATER MANAGEMENT SCHEMATIC DETENTION POND V = 3,250 m3 V = 0 m3 Q = 0 m3/s VOUT = 14,070 m3 QOUT = TBC VIA HYDRAULIC DESIGN TO RECEIVING ENVIRONMENT TO TREATMENT PLANT OPTION 1 - ALL FLOW TO TREATMENT PLANT SWALES WRS BASE COLLECTION POND SEEPAGE DRAINS AND LOWER ROCK STACK CHANNEL CATCHMENT 5: -MAGAZINE STORAGE AREA (C5B) WESTERN CATCHMENT/STREAM CATCHMENT 2: -MAGAZINE STORAGE AREA (C2B) -MAGAZINE ACCESS ROAD DIVERSION DRAINS/BUNDS VPOST= 12,000 m3 PEAK Q= 2.3 m3/s VPRE= 3,782 m3, PEAK Q= 0.7 m3/s VPOST= 4,300 m3 PEAK Q= 0.8 m3/s VPRE= 11,680 m3 PEAK Q= 2.0 m3/s VPOST= 3,970 m3 PEAK Q= 0.8 m3/s VPOST= 1,870 m3 PEAK Q= 0.2 m3/s CATCHMENT 6: VPRE= 5,375 m3 PEAK Q= 0.9 m3/s VPOST= 3,203 m3 PEAK Q= 0.6 m3/s CLEAN WATER DIVERSION CLEAN WATER DIVERSION MINE ACCESS ROAD AND MAIN CONTACT POND VPOST= 3,430 m3 PEAK Q= 0.6 m3/s DIVERSION DRAINS/BUNDS
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