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HomeMy WebLinkAboutSW6231002_Design Calculations_20240906 Land Use&CN Summary-SERENITY PH8-9-02190647 P-LU&CNCalcs 1. WithersRavenel Serenity Ph 8&9-Harnett Co.,NC Summary of Hydrology Inputs Per Sub-Drainage Area Proposed Conditions Project Area Land Use HSG CN %Total Imp Total Imp Area Area Area (sf) (sf) (ac) Drainage Area to POA 8A Sub-Drainage Area to SCM 6-WET POND ONSITE-PHASES 8&9 OPEN SPACE A 39 --- --- 10,882 0.25 ONSITE-PHASES 8&9 OPEN SPACE B 61 --- --- 13,279 0.30 ONSITE-PHASES 8&9 LOTS-LIGHT BLUE A 65 44% 24,707 56,598 1.30 ONSITE-PHASES 8&9 LOTS-LIGHT BLUE B 78 44% 27,874 63,852 1.47 ONSITE-PHASES 8&9 LOTS-RED A 67 46% 21,516 46,522 1.07 ONSITE-PHASES 8&9 LOTS-RED B 79 46% 97,103 209,959 4.82 ONSITE-PHASES 8&9 ROADWAY A 98 100% 19,866 19,866 0.46 ONSITE-PHASES 8&9 ROADWAY B 98 100% 41,072 41,072 0.94 ONSITE-PHASES 8&9 SCM A 98 --- --- 11,710 0.27 ONSITE-PHASES 8&9 SIDEWALK A 98 100% 6,013 6,013 0.14 ONSITE-PHASES 8&9 SIDEWALK B 98 100% 13,077 13,077 0.30 ONSITE-PHASES 8&9 WOODS B 60 --- --- 2,187 0.05 ONSITE-PHASES 8&9 AMENITY D 98 100% 20,000 20,000 0.46 Total Onsite Impervious Area: 271,228 6.23 Total Lot Impervious Area: 171,200 3.93 Total Phase 8&9 Area: 515,017 11.82 Total Onsite Area: 515,017 11.82 Total Sub-Drainage Basin Area: 515,017 11.82 Total Impervious Area: 271,228 6.23 Cumulative Curve Number(CN): 79 Sub-Drainage Area to SCM 7-WET POND ONSITE-PHASES 8&9 OPEN SPACE A 39 --- --- 67,604 1.55 ONSITE-PHASES 8&9 OPEN SPACE B 61 --- --- 17,664 0.41 ONSITE-PHASES 8&9 OPEN SPACE D 80 --- --- 998 0.02 ONSITE-PHASES 8&9 LOTS-BLUE A 69 50% 107,305 216,723 4.98 ONSITE-PHASES 8&9 LOTS-BLUE B 80 50% 127 257 0.01 ONSITE-PHASES 8&9 LOTS-BLUE D 89 50% 14,472 29,228 0.67 ONSITE-PHASES 8&9 LOTS-LIGHT BLUE A 65 44% 89,906 205,954 4.73 ONSITE-PHASES 8&9 LOTS-LIGHT BLUE B 78 44% 48,262 110,556 2.54 ONSITE-PHASES 8&9 LOTS-RED A 67 46% 60,117 129,985 2.98 ONSITE-PHASES 8&9 LOTS-RED B 79 46% 27,795 60,099 1.38 ONSITE-PHASES 8&9 ROADWAY A 98 100% 86,947 86,947 2.00 ONSITE-PHASES 8&9 ROADWAY B 98 100% 41,957 41,957 0.96 ONSITE-PHASES 8&9 ROADWAY D 98 100% 3,139 3,139 0.07 ONSITE-PHASES 8&9 SCM A 98 --- --- 24,793 0.57 ONSITE-PHASES 8&9 SIDEWALK A 98 100% 27,484 27,484 0.63 ONSITE-PHASES 8&9 SIDEWALK B 98 100% 12,444 12,444 0.29 ONSITE-PHASES 8&9 SIDEWALK D 98 100% 865 865 0.02 ONSITE-PHASES 8&9 WOODS A 36 --- --- 312 0.01 ONSITE-PHASES 8&9 WOODS B 60 --- --- 31,619 0.73 ONSITE-PHASES 8&9 AMENITY B 98 100% 30,000 30,000 0.69 Total Onsite Impervious Area: 550,820 12.65 Total Lot Impervious Area: 347,983 7.99 Total Phase 8&9 Area: 1,098,629 25.22 Total Onsite Area: 1,098,629 25.22 Total Sub-Drainage Basin Area: 1,098,629 25.22 Total Impervious Area: 550,820 12.65 Cumulative Curve Number(CN): 74 Sub-Drainage Area to SCM 13 ' ONSITE-OTHER PHASES OPEN SPACE A 39 --- --- 7,400 0.17 ONSITE-PHASES 8&9 OPEN SPACE A 39 --- --- 7,922 0.18 ONSITE-PHASES 8&9 LOTS-LIGHT BLUE A 65 44% 9,333 16,497 0.38 ONSITE-PHASES 8&9 ROADWAY A 98 100% 24,918 24,918 0.57 ONSITE-PHASES 8&9 SIDEWALK A 98 100% 6,270 6,270 0.14 II I Total Onsite Impervious Area: 40,521 0.93 Total Lot Impervious Area: 9,333 0.21 Total Phase 8&9 Area: 55,607 1.28 Total Onsite Area: 63,008 1.45 Total Sub-Drainage Basin Area: 63,008 1.45 Total Impervious Area: 40,521 0.93 Cumulative Curve Number(CN): 75 K:\19\19-0640\190647-Serenity Smith Betts-Harnett Co\Storm\SWMP\Phase 8-9 Docs&Design\SCM Sizing\Land Use&CN Summary-SERENITY PH8-9-02190647 Land Use&CN Summary-SERENITY PH8-9-02190647 P-LU&CNCalcs 1. WithersRavenel Serenity Ph 8&9-Harnett Co.,NC Summary of Hydrology Inputs Per Sub-Drainage Area Proposed Conditions Project Area Land Use HSG CN %Total Imp Total Imp Area Area Area (sf) (sf) (ac) Sub-Drainage Area Bypassing SCM to POA 8A ONSITE-PHASES 8&9 OPEN SPACE A 39 --- --- 119,903 2.75 ONSITE-PHASES 8&9 OPEN SPACE D 80 --- --- 29,337 0.67 ONSITE-PHASES 8&9 LOTS-BLUE A 69 50% 675 1,364 0.03 ONSITE-PHASES 8&9 LOTS-BLUE D 89 50% 596 1,203 0.03 ONSITE-PHASES 8&9 LOTS-LIGHT BLUE A 65 44% 3,159 7,237 0.17 ONSITE-PHASES 8&9 LOTS-RED A 67 46% 2,435 5,266 0.12 ONSITE-PHASES 8&9 SURFACE WATERS A 98 --- --- 6,241 0.14 ONSITE-PHASES 8&9 SURFACE WATERS D 98 --- --- 3,304 0.08 ONSITE-PHASES 8&9 WOODS A 36 --- --- 131,057 3.01 ONSITE-OTHER PHASES WOODS D 79 --- --- 25,995 0.60 ONSITE-PHASES 8&9 WOODS D 79 --- --- 129,619 2.98 Total Onsite Impervious Area: 6,866 0.16 Total Lot Impervious Area: 6,866 0.16 Total Phase 8&9 Area: 434,529 9.98 Total Onsite Area: 460,524 10.57 Total Sub-Drainage Basin Area: 460,524 10.57 Total Impervious Area: 6,866 0.16 Cumulative Curve Number(CN): 56 Drainage Area to POA 8B ONSITE-PHASES 8&9 OPEN SPACE A 39 --- --- 18,121 0.42 ONSITE-PHASES 8&9 OPEN SPACE B 61 --- --- 1,674 0.04 ONSITE-PHASES 8&9 LOTS-BLUE A 69 50% 869 1,755 0.04 ONSITE-PHASES 8&9 LOTS-BLUE B 80 50% 793 1,601 0.04 ONSITE-OTHER PHASES SURFACE WATERS A 98 --- --- 1,466 0.03 ONSITE-PHASES 8&9 SURFACE WATERS A 98 --- --- 12,112 0.28 OFFISTE WOODS A 36 --- --- 327,947 7.53 ONSITE-OTHER PHASES WOODS A 36 --- --- 528,126 12.12 ONSITE-PHASES 8&9 WOODS A 36 --- --- 94,170 2.16 OFFISTE WOODS B 60 --- --- 37,919 0.87 ONSITE-OTHER PHASES WOODS B 60 --- --- 10,713 0.25 ONSITE-PHASES 8&9 WOODS B 60 --- --- 25,034 0.57 OFFISTE WOODS D 79 --- --- 108,033 2.48 ONSITE-OTHER PHASES WOODS D 79 --- --- 292,629 6.72 ONSITE-PHASES 8&9 WOODS D 79 --- --- 1,264 0.03 Total Onsite Impervious Area: 1,662 0.04 Total Lot Impervious Area: 1,662 0.04 Total Phase 8&9 Area: 155,730 3.58 Total Onsite Area: 988,665 22.70 Total Sub-Drainage Basin Area: 1,462,564 33.58 Total Impervious Area: 1,662 0.04 Cumulative Curve Number(CN): 50 Drainage Area to POA 9A Sub-Drainage Area to SCM 8-WET POND ONSITE-PHASES 8&9 OPEN SPACE A 39 --- --- 11,168 0.26 ONSITE-PHASES 8&9 OPEN SPACE B 61 --- --- 25,602 0.59 ONSITE-PHASES 8&9 OPEN SPACE D 80 --- --- 1,034 0.02 ONSITE-PHASES 8&9 LOTS-BLUE A 69 50% 25,747 52,001 1.19 ONSITE-PHASES 8&9 LOTS-BLUE B 80 50% 74,135 149,731 3.44 ONSITE-PHASES 8&9 LOTS-LIGHT BLUE A 65 44% 698 1,599 0.04 ONSITE-PHASES 8&9 LOTS-LIGHT BLUE B 78 44% 28,845 66,077 1.52 ONSITE-PHASES 8&9 ROADWAY B 98 100% 28,242 28,242 0.65 ONSITE-PHASES 8&9 SCM B 98 --- --- 14,084 0.32 ONSITE-PHASES 8&9 SIDEWALK B 98 100% 8,891 8,891 0.20 ONSITE-PHASES 8&9 WOODS B 60 --- --- 4,702 0.11 ONSITE-PHASES 8&9 AMENITY B 98 100% 25,000 25,000 0.57 I Total Onsite Impervious Area: 1919,558 4.40 Total Lot Impervious Area: 129,425 2.97 Total Phase 8&9 Area: 388,130 8.91 Total Onsite Area: 388,130 8.91 Total Sub-Drainage Basin Area: 388,130 8.91 Total Impervious Area: 191,558 4.40 Cumulative Curve Number(CN): 79 K:\19\19-0640\190647-Serenity Smith Betts-Harnett Co\Storm\SWMP\Phase 8-9 Docs&Design\SCM Sizing\Land Use&CN Summary-SERENITY PH8-9-02190647 Land Use&CN Summary-SERENITY PH8-9-02190647 P-LU&CNCalcs 1. WithersRavenel Serenity Ph 8&9-Harnett Co.,NC Summary of Hydrology Inputs Per Sub-Drainage Area Proposed Conditions Project Area Land Use HSG CN %Total Imp Total Imp Area Area Area (sf) (sf) (ac) Sub-Drainage Area to SCM 9-WET POND ONSITE-PHASES 8&9 OPEN SPACE B 61 --- --- 16,847 0.39 ONSITE-PHASES 8&9 OPEN SPACE D 80 --- --- 13,885 0.32 ONSITE-PHASES 8&9 LOTS-BLUE B 80 50% 66,372 134,052 3.08 ONSITE-PHASES 8&9 LOTS-BLUE D 89 50% 10,828 21,870 0.50 ONSITE-PHASES 8&9 LOTS-LIGHT BLUE B 78 44% 136,063 311,687 7.16 ONSITE-PHASES 8&9 LOTS-LIGHT BLUE D 88 44% 3,078 7,050 0.16 ONSITE-PHASES 8&9 LOTS-RED B 79 46% 534 1,154 0.03 ONSITE-PHASES 8&9 ROADWAY B 98 100% 75,764 75,764 1.74 ONSITE-PHASES 8&9 ROADWAY D 98 100% 14,680 14,680 0.34 ONSITE-PHASES 8&9 SCM B 98 --- --- 10,595 0.24 ONSITE-PHASES 8&9 SCM D 98 --- --- 5,214 0.12 ONSITE-PHASES 8&9 SIDEWALK B 98 100% 22,576 22,576 0.52 ONSITE-PHASES 8&9 SIDEWALK D 98 100% 4,155 4,155 0.10 ONSITE-PHASES 8&9 WOODS B 60 --- --- 21,639 0.50 ONSITE-PHASES 8&9 AMENITY B 98 100% 20,000 20,000 0.46 Total Onsite Impervious Area: 354,051 8.13 Total Lot Impervious Area: 216,875 4.98 Total Phase 8&9 Area: 681,171 15.64 Total Onsite Area: 681,171 15.64 Total Sub-Drainage Basin Area: 681,171 15.64 Total Impervious Area: 354,051 8.13 Cumulative Curve Number(CN): 82 Sub-Drainage Area Bypassing SCM to POA 9A ' M7 OFFISTE OPEN SPACE A 39 --- --- 4,318 0.10 OFFISTE OPEN SPACE B 61 --- --- 21,161 0.49 ONSITE-PHASES 8&9 OPEN SPACE B 61 --- --- 84,324 1.94 OFFISTE OPEN SPACE D 80 --- --- 99,733 2.29 ONSITE-PHASES 8&9 OPEN SPACE D 80 --- --- 36,711 0.84 OFFISTE 1 ACRE RES B 68 20% 14,049 70,243 1.61 ONSITE-PHASES 8&9 LOTS-BLUE A 69 50% 2,072 4,186 0.10 ONSITE-PHASES 8&9 LOTS-BLUE B 80 50% 117 236 0.01 ONSITE-PHASES 8&9 LOTS-LIGHT BLUE B 78 44% 27,324 62,593 1.44 ONSITE-PHASES 8&9 LOTS-LIGHT BLUE D 88 44% 9,963 22,823 0.52 ONSITE-PHASES 8&9 SCM B 98 --- --- 618 0.01 ONSITE-PHASES 8&9 SIDEWALK B 98 100% 154 154 0.00 ONSITE-PHASES 8&9 SURFACE WATERS A 98 --- --- 708 0.02 ONSITE-PHASES 8&9 SURFACE WATERS D 98 --- --- 20,974 0.48 ONSITE-PHASES 8&9 WETLAND A 98 --- --- 4,241 0.10 OFFISTE WETLAND B 98 --- --- 383 0.01 ONSITE-PHASES 8&9 WETLAND B 98 --- --- 26,810 0.62 OFFISTE WETLAND D 98 --- --- 347 0.01 ONSITE-PHASES 8&9 WETLAND D 98 --- --- 70,512 1.62 OFFISTE WOODS A 36 --- --- 174,837 4.01 ONSITE-PHASES 8&9 WOODS A 36 --- --- 83,134 1.91 OFFISTE WOODS B 60 --- --- 782,636 17.97 ONSITE-PHASES 8&9 WOODS B 60 --- --- 150,929 3.46 OFFISTE WOODS D 79 --- --- 25,501 0.59 ONSITE-PHASES 8&9 WOODS D 79 --- --- 278,499 6.39 Total Onsite Impervious Area: 39,630 0.91 Total Lot Impervious Area: 39,477 0.91 Total Phase 8&9 Area: 847,451 19.45 Total Onsite Area: 847,451 19.45 Total Sub-Drainage Basin Area: 2,026,610 46.52 Total Impervious Area: 53,679 1.23 Cumulative Curve Number(CN): 65 K:\19\19-0640\190647-Serenity Smith Betts-Harnett Co\Storm\SWMP\Phase 8-9 Docs&Design\SCM Sizing\Land Use&CN Summary-SERENITY PH8-9-02190647 Land Use&CN Summary-SERENITY PH8-9-02190647 P-LU&CNCalcs 1. WithersRavenel Serenity Ph 8&9-Harnett Co.,NC Summary of Hydrology Inputs Per Sub-Drainage Area Proposed Conditions Project Area Land Use HSG CN %Total Imp Total Imp Area Area Area (sf) (sf) (ac) Drainage Area to POA 9B Ai illi Ai. Sub-Drainage Area to SCM 10-WET POND ONSITE-PHASES 8&9 OPEN SPACE A 39 --- --- 14,513 0.33 ONSITE-PHASES 8&9 OPEN SPACE B 61 --- --- 14,487 0.33 ONSITE-PHASES 8&9 LOTS-BLUE A 69 50% 49,419 99,812 2.29 ONSITE-PHASES 8&9 LOTS-BLUE B 80 50% 77,208 155,937 3.58 ONSITE-PHASES 8&9 LOTS-BLUE D 89 50% 3,211 6,484 0.15 ONSITE-PHASES 8&9 LOTS-LIGHT BLUE A 65 44% 70,516 161,535 3.71 ONSITE-PHASES 8&9 LOTS-LIGHT BLUE B 78 44% 53,883 123,433 2.83 ONSITE-PHASES 8&9 LOTS-LIGHT BLUE D 88 44% 1,238 2,837 0.07 ONSITE-PHASES 8&9 ROADWAY A 98 100% 48,003 48,003 1.10 ONSITE-PHASES 8&9 ROADWAY B 98 100% 54,610 54,610 1.25 ONSITE-PHASES 8&9 SCM A 98 --- --- 19,403 0.45 ONSITE-PHASES 8&9 SIDEWALK A 98 100% 14,644 14,644 0.34 ONSITE-PHASES 8&9 SIDEWALK B 98 100% 16,986 16,986 0.39 ONSITE-PHASES 8&9 WOODS A 36 --- --- 14,092 0.32 ONSITE-PHASES 8&9 WOODS B 60 --- --- 13,886 0.32 ONSITE-PHASES 8&9 AMENITY B 98 100% 45,000 45,000 1.03 i Total Onsite Impervious Area: 434,718 9.98 Total Lot Impervious Area: 255,475 5.86 Total Phase 8&9 Area: 805,662 18.50 Total Onsite Area: 805,662 18.50 Total Sub-Drainage Basin Area: 805,662 18.50 Total Impervious Area: 434,718 9.98 Cumulative Curve Number(CN): 78 Sub-Drainage Area to SCM 11-WET POND ONSITE-PHASES 8&9 OPEN SPACE A 39 --- --- 5,168 0.12 OFFISTE OPEN SPACE B 61 --- --- 1,172 0.03 ONSITE-PHASES 8&9 OPEN SPACE B 61 --- --- 15,454 0.35 ONSITE-PHASES 8&9 OPEN SPACE D 80 --- --- 5,882 0.14 ONSITE-PHASES 8&9 LOTS-BLUE A 69 50% 18,185 36,728 0.84 ONSITE-PHASES 8&9 LOTS-BLUE B 80 50% 54,701 110,479 2.54 ONSITE-PHASES 8&9 LOTS-LIGHT BLUE A 65 44% 11,877 27,207 0.62 ONSITE-PHASES 8&9 LOTS-LIGHT BLUE B 78 44% 59,783 136,949 3.14 ONSITE-PHASES 8&9 LOTS-LIGHT BLUE D 88 44% 854 1,957 0.04 ONSITE-PHASES 8&9 PUMP STATION B 98 100% 3,014 3,014 0.07 ONSITE-PHASES 8&9 PUMP STATION D 98 100% 623 623 0.01 ONSITE-PHASES 8&9 ROADWAY A 98 100% 13,038 13,038 0.30 ONSITE-PHASES 8&9 ROADWAY B 98 100% 39,541 39,541 0.91 ONSITE-PHASES 8&9 ROADWAY D 98 100% 30,338 30,338 0.70 ONSITE-PHASES 8&9 SCM B 98 --- --- 2,351 0.05 ONSITE-PHASES 8&9 SCM D 98 --- --- 6,889 0.16 ONSITE-PHASES 8&9 SIDEWALK A 98 100% 3,557 3,557 0.08 ONSITE-PHASES 8&9 SIDEWALK B 98 100% 11,840 11,840 0.27 ONSITE-PHASES 8&9 SIDEWALK D 98 100% 8,940 8,940 0.21 ONSITE-PHASES 8&9 WOODS A 36 --- --- 3,268 0.08 OFFISTE WOODS B 60 --- --- 13,801 0.32 ONSITE-PHASES 8&9 WOODS B 60 --- --- 10,529 0.24 ONSITE-PHASES 8&9 WOODS D 79 --- --- 8,984 0.21 ONSITE-PHASES 8&9 AMENITY B 98 100% 28,500 28,500 0.65 Total OnsiteTotalLot ImperviousImpervious Area: Area: 284,790 6.54 145,400 3.34 Total Phase 8&9 Area: 511,235 11.74 Total Onsite Area: 511,235 11.74 Total Sub-Drainage Basin Area: 526,207 12.08 Total Impervious Area: 284,790 6.54 Cumulative Curve Number(CN): 81 K:\19\19-0640\190647-Serenity Smith Betts-Harnett Co\Storm\SWMP\Phase 8-9 Docs&Design\SCM Sizing\Land Use&CN Summary-SERENITY PH8-9-02190647 Land Use&CN Summary-SERENITY PH8-9-02190647 P-LU&CNCalcs 1. WithersRavenel Serenity Ph 8&9-Harnett Co.,NC Summary of Hydrology Inputs Per Sub-Drainage Area Proposed Conditions Project Area Land Use HSG CN %Total Imp Total Imp Area Area Area (sf) (sf) (ac) Sub-Drainage Area to SCM 12 ONSITE-PHASES 8&9 OPEN SPACE A 39 --- --- 853 0.02 ONSITE-PHASES 8&9 OPEN SPACE B 61 --- --- 5,661 0.13 ONSITE-PHASES 8&9 LOTS-BLUE A 69 50% 4,265 8,615 0.20 ONSITE-PHASES 8&9 LOTS-BLUE B 80 50% 10,285 20,772 0.48 ONSITE-PHASES 8&9 ROADWAY A 98 100% 2,553 2,553 0.06 ONSITE-PHASES 8&9 ROADWAY B 98 100% 17,504 17,504 0.40 ONSITE-PHASES 8&9 SIDEWALK A 98 100% 1,010 1,010 0.02 ONSITE-PHASES 8&9 SIDEWALK B 98 100% 4,925 4,925 0.11 Total Onsite Impervious Area: 40,541 0.93 Total Lot Impervious Area: 14,550 0.33 Total Phase 8&9 Area: 61,892 1.42 Total Onsite Area: 61,892 1.42 Total Sub-Drainage Basin Area: 61,892 1.42 Total Impervious Area: 40,541 0.93 Cumulative Curve Number(CN): 84 Sub-Drainage Area Bypassing SCM to POA 9B OFFISTE OPEN SPACE A 39 --- --- 6,999 0.16 ONSITE-PHASES 8&9 OPEN SPACE A 39 --- --- 83,380 1.91 OFFISTE OPEN SPACE B 61 --- --- 24,934 0.57 ONSITE-PHASES 8&9 OPEN SPACE B 61 --- --- 84,891 1.95 OFFISTE OPEN SPACE D 80 --- --- 20,420 0.47 ONSITE-PHASES 8&9 OPEN SPACE D 80 --- --- 138,074 3.17 OFFISTE 1 ACRE RES B 68 20% 2,546 12,729 0.29 ONSITE-PHASES 8&9 LOTS-BLUE A 69 50% 37,703 76,150 1.75 ONSITE-PHASES 8&9 LOTS-BLUE B 80 50% 22,589 45,622 1.05 ONSITE-PHASES 8&9 LOTS-BLUE D 89 50% 5,177 10,456 0.24 ONSITE-PHASES 8&9 LOTS-LIGHT BLUE A 65 44% 43,341 99,285 2.28 ONSITE-PHASES 8&9 LOTS-LIGHT BLUE B 78 44% 15,060 34,500 0.79 ONSITE-PHASES 8&9 LOTS-LIGHT BLUE D 88 44% 6,233 14,279 0.33 ONSITE-PHASES 8&9 LOTS-RED A 67 46% 1,288 2,785 0.06 ONSITE-PHASES 8&9 LOTS-RED B 79 46% 412 891 0.02 OFFISTE ROADWAY A 98 100% 3,711 3,711 0.09 ONSITE-PHASES 8&9 ROADWAY A 98 100% 149 149 0.00 OFFISTE ROADWAY B 98 100% 14,640 14,640 0.34 ONSITE-PHASES 8&9 ROADWAY B 98 100% 1,404 1,404 0.03 OFFISTE ROADWAY D 98 100% 1,992 1,992 0.05 OFFISTE ROW CROPS A 72 --- --- 11,413 0.26 OFFISTE ROW CROPS B 81 --- --- 9,585 0.22 OFFISTE ROW CROPS D 91 --- --- 1,383 0.03 ONSITE-PHASES 8&9 SIDEWALK A 98 100% 66 66 0.00 ONSITE-PHASES 8&9 SIDEWALK B 98 100% 576 576 0.01 ONSITE-PHASES 8&9 SURFACE WATERS A 98 --- --- 3,069 0.07 ONSITE-PHASES 8&9 SURFACE WATERS B 98 --- --- 14,013 0.32 ONSITE-PHASES 8&9 SURFACE WATERS D 98 --- --- 8,078 0.19 ONSITE-PHASES 8&9 WETLAND A 98 --- --- 47,865 1.10 ONSITE-PHASES 8&9 WETLAND B 98 --- --- 22,428 0.51 OFFISTE WETLAND D 98 --- --- 12,189 0.28 ONSITE-PHASES 8&9 WETLAND D 98 --- --- 154,793 3.55 OFFISTE WOODS A 36 --- --- 754,852 17.33 ONSITE-PHASES 8&9 WOODS A 36 --- --- 106,501 2.44 OFFISTE WOODS B 60 --- --- 796,603 18.29 ONSITE-PHASES 8&9 WOODS B 60 --- --- 120,745 2.77 OFFISTE WOODS D 79 --- --- 403,734 9.27 ONSITE-PHASES 8&9 WOODS D 79 --- --- 131,552 3.02 I Total Onsite Impervious Area: 133,999 3.08 Total Lot Impervious Area: 131,804 3.03 Total Phase 8&9 Area: 1,201,551 27.58 Total Onsite Area: 1,201,551 27.58 Total Sub-Drainage Basin Area: 3,276,736 75.22 Total Impervious Area: 156,887 3.60 Cumulative Curve Number(CN): 62 K:\19\19-0640\190647-Serenity Smith Betts-Harnett Co\Storm\SWMP\Phase 8-9 Docs&Design\SCM Sizing\Land Use&CN Summary-SERENITY PH8-9-02190647 Land Use&CN Summary-SERENITY PH8-9-02190647 P-LU&CNCalcs ;O WithersRavenel Serenity Ph 8&9-Harnett Co.,NC Summary of Hydrology Inputs Per Sub-Drainage Area Proposed Conditions Project Area Land Use HSG CN %Total Imp Total Imp Area Area Area (sf) (sf) (ac) (Total Site Information Total Onsite Impervious Area: 2,350,383 53.96 Total Lot Impervious Area Bypassing SCMs: 179,808 4.13 Total Phase 8&9 Area: 6,756,606 155.11 Total Onsite Area: 7,622,935 175.00 Total Onsite Surface Waters: 69,964 1.61 Total Impervious Area: 2,387,320 54.81 Total Watershed Area: 11,366,150 260.93 K:\19\19-0640\190647-Serenity Smith Betts-Harnett Co\Storm\SWMP\Phase 8-9 Docs&Design\SCM Sizing\Land Use&CN Summary-SERENITY PH8-9-02190647