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HomeMy WebLinkAboutLEMDP DebrisVolumeBULKING FACTOR DETERMINATION WORKSHEET 1) Determine the Debris Yield* Where: Dy = Debris Yield given in cubic yards per square mile P = Maximum one-hour precipitation (Usually 100-year as shown on isohyeatal map), inches RR = Relief Ratio given in feet-of-drop per mile (ft/mile) A = Area of the watershed, Acres FF = Fire Factor (Non-dimensional) User to Supply: Work sheet computes: *Based on Tatum method (US Army COE, Los Angeles District) 2) Use Dy (above) to determine the Bulking Factor: Where: Fb = Bulking Factor D = Debris Yield Worksheet Computes: Solution: = User entry required P = RR = A = FF = Dy Fb = Debris Basin ID DB1 DB2 DB3 DB4 DB5 DB6(4) DB7 DB9 DB10 Line A DB9A DB8 DB11 (1) NOAA 14 data, average point rainfall of 6 MDP regions (2) less than one year after 100% burn (3) U.S. Army Corps of Engineers (USACE)-Los Angeles District Method A-T factor of 0.65 was applied to DB6 (Parent Material = 0.25, Soils = 0.25, Channel Morphology = 0.05, Hillside Morphology = 0.10) (4) USACE Los Angeles District Debris Method Equation 2 used for area greater than 3.0 sqmi. 1.34 777.5 325 6.5 25526.505805082 1.21272088170902 Use LogDy = 36375.8591744742 Watershed ID A1 A2 A11 A12 A10 A5-1 A4-1 A6 A7 (Pac 1) A4-2 Watershed A A7-1 Pac10 T1 5.69190983707751 0.0625 0.0625 0.05 0.025 0.2 Watershed A: 2-Year Storm Inches/hr ft/mile acres Yds^3/mi.^2 1.21 1.38261811893713 Drainage Area (ac) 949.212 1425.369 191.678 243.919 821.779 5132.8 708.48 5133 1838 130.902 267.9 293 362.4 497.4 1.96116005248575 Drainage Area (sqmi) 1.48314375 2.2271390625 0.299496875 0.3811234375 1.2840296875 8.02 1.107 8.0203125 2.871875 0.204534375 0.41859375 0.4578125 0.56625 0.7771875 3.00121381182404 0.025 = Computed by worksheet * 0.437035088449478 100-Yr 1-Hr Rainfall (1) (in) 1.34 1.34 1.34 1.34 1.34 1.34 1.34 1.34 1.34 1.34 1.34 1.34 1.34 1.34 1.11228117468304 0.0125 0.78 Slope (ft/mi) 396.2 303.2 523.3 512.1 264.7 125.5 230.1 777.5 634.3 350.7 1456 713.1 765.2 765.2 0.148414850570431 Fire Factor (2) 6.5 6.5 6.5 6.5 6.5 4 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5 1.43 A-T Factor 1 1 1 1 1 0.65 1 1 1 1 1 1 1 1 Yield (3) (cy/sqmi) 20382.1723991445 18577.922066778 18159.6127455701 18712.0898220057 15466.1233496025 15355.3744 13805.9211792871 41948.7663182278 30734.2791326709 13229.0489839887 36375.8591744742 23746.9348742496 25775.8187367959 27287.6185530581 24066.5612400627 Debris Vol. (3) (ac-ft) 18.7374511258092 25.6460962786879 3.37113135192319 4.42043233235507 12.3092992797933 76.3328670497192 9.47304950481365 208.538996690993 54.7098294268734 1.67714931436281 9.43806134681791 6.73863609615874 9.04685189161362 13.1452315016557 ac-ft 10^(0.65*(LOG10(M40*100))+0.62*(LOG10(M41))+0.18*(LOG10(M42))+0.12*M43) cu-yd/sqmi 25526.5 sqmi 0.51 0.000619836 cu-yd 13018.515 ac-ft 8.06928065758791 BULKING FACTOR DETERMINATION WORKSHEET 1) Determine the Debris Yield* Where: Dy = Debris Yield given in cubic yards per square mile Q = Unit Peak Runoff (cfs/mi2) RR = Relief Ratio given in feet-of-drop per mile (ft/mile) A = Area of the watershed, Acres FF = Fire Factor (Non-dimensional) User to Supply: Work sheet computes: *Based on Tatum method (US Army COE, Los Angeles District) 2) Use Dy (above) to determine the Bulking Factor: Where: Fb = Bulking Factor D = Debris Yield Worksheet Computes: Solution: = User entry required Q = RR = A = FF = Dy Fb = 423.3 125.5 5133 4 23623.6529271124 1.1968637743926 Use cfs/mi2 ft/mile acres Yds^3/mi.^2 1.2 Debris Basin DB6: 100-Year Storm = Computed by worksheet * A-T Factor 0.65 Adjust Dy 15355.374402623 vol. (cy) 123150.102709037 vol. (ac-ft) 76.3328670627585 Debris Basin (name) Line A Line B Line F Line I Line K Line N Line O-10 Line O-20 Drainage Area (sqmi) Debris Volume (ac-ft) 9.3 15.7 2.6 3 7.4 9.3 9.1 6.7 50000 50000 50000 R-W Area (ac) 1.5 1.6 1.9 0.9 4.8 2.9 1.8 2.1 48665 48665 48665 Embankment Height (ft) 20 27 13 24 36 33 28 23 105 0.21 0.21 0.21 Construction Cost ($) 187917 307965 164115 134205 771489 389992 196342 Debris Basin (name) DB8 DB9 DB9A Engr Cost ($) 20% of Total Cost 71895 117825 62789 51346 295166 149208 75119 Debris Vol (ac-ft) 9 54.7 6.7 R-W Cost ($) 111000 120000 437000 68000 360000 218000 135000 R/W (0.21 ac/Debris Vol) 1.89 11.487 1.407 Total Cost ($) 370812 541000 661000 251000 1414000 751000 403000 R/W Cost ($50,000/ac) 94500 574350 70350 Debris Vol/R-W (ft) 6.2 9.8125 1.36842105263158 3.33333333333333 1.54166666666667 3.20689655172414 5.05555555555556 Average(Constr Cost+Engr Cost) per ac-ft of Debris Vol. = Average = Constr+Engr Cost ($) 437985 2661975.5 326055.5 R-W/Debris Vol 0.161290322580645 0.101910828025478 0.730769230769231 0.3 0.648648648648649 0.311827956989247 0.197802197802198 0.214566261079514 R-W Cost/ac ($/ac) 74000 75000 230000 75555.5555555555 75000 75172.4137931034 75000 R/W ac/Debris Vol (Constr+Engr Cost)/Debris Vol ($/ac-ft) 27936.7741935484 27120.3821656051 87270.7692307692 61850.3333333333 144142.567567568 57978.4946236559 29830.8791208791 48664.6054446318 0.193885311154979 0.21779112754159 9.49909228441755E-02 0.204565737051793 0.20874540311174 0.198679094540613 0.186399503722084 50000 50000 50000 50000 50000 50000 50000 50000 50000 50000 50000 50000 50000 50000 48665 48665 48665 48665 48665 48665 48665 48665 48665 48665 48665 48665 48665 48665 0.21 0.21 0.21 0.21 0.21 0.21 0.21 0.21 0.21 0.21 0.21 0.21 0.21 0.21 Debris Basin (name) DB1 DB2 DB5 DB6 DB8 DB9 DB9A DB10 DB11 (3) (1) Estimated R/W needed based on average from Lakeland MDP (2) Estimated cost based on average from Lakeland Village MDP (3) Estimated detention storage volume needed Drainage Sytem (name) - - - Line L14 Line A02 Line A04 Line A04 Line T10-01 Line L22 Drainage Area (ac) 949 1425 822 5133 362 1838 293 131 497 Debris Vol (ac-ft) 18.7 25.6 12.3 76 9 54.7 6.7 1.7 25 15-0169 R/W (1) (0.21 ac/Debris Vol) 3.927 5.376 2.583 15.96 1.89 11.487 1.407 0.357 5.25 R/W Cost ($50,000/ac) 196350 268800 129150 798000 94500 574350 70350 17850 262500 Constr Cost + Engr Cost (2) ($) 910035.5 1245824 598579.5 3698540 437985 2661975.5 326055.5 82730.5 1216625 Total Cost ($) 1106385.5 1514624 727729.5 4496540 532485 3236325.5 396405.5 100580.5 1479125