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HomeMy WebLinkAboutFDP201700002 Calculations Floodplain Development Permit 2017-02-28 IA t c., PAs v-z.c,f.._L.. t 3 _E) ‘:-....xi3 -c ----) i -1'4k t_.I.- 2. t4 ...•vti sk- Q-i--i''‘'E-1--4-t-f> - At.L.„c•JA 0 g. 0‘-c. "Q...4;2 -.-- AP_ I Nk-1-(..3 Exks-r‘ r--1 C.v At5...., -4T5 ; ,.....,_ ea.. --1-2...,.),...._tc.....--, 17-4 ...--. ----:-•-;._,..A-C...,,VE..... t • rktt-2--, A io -r- -cf.) vs, I L.A_. 3 •I-Z. \ it- \C ,... ç S ,":"5 - -Sit)\Al 4 -... .....L.40‘.45) 0 Av-‘) r-x- 1-4'c.c.. r...c._-..5.-; sk-tO...;-( . \ _ ,....... A r-A ,k-'<,-.:\,' I r-, r 51 t ‘ 0 t.. 2- V:.`i CO '..---. 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"c-IV\ iSiera AL---(S t-S_ (Cco•rt ' 1---72.z. ‘V•it- a _ ç ;. 0,6g,(30„.00:1.2" 111800,f51 e etal. :146 — — . \at _ call-z. 0 t2. cl € 1 --1 . o 3 p 1.03 & sJ C-kir is e34-.1 micoao If Lbs- --c1000 - (g.loota . . kc...-ro IRr la Z. c,4e.c-v--. .R.t•tz›C.-E_ 14, r4-0 k,r its Vertdt ei-4-r- ‘1,''‘4 Fmco:2Er,q e,, k---c -,k ->c % T.Ltt-.1G, k r--1 za. -S _ Zc., • 7,...5 . , . • ../-z_ si4A64 --- la 375 ' (Sr.7 _, k 13 , 3 T5 5i 001 17-II) ,_... cl) cict4, S v5 t < 19(800 1/ . . Vt)cri- t7c ---, : i.kTIVE-... CIA -Tim-r- -,... . _ ___. 1._____.... ______ — , _ 1 , _______, I I I . . I ! • ! i 1 ! 1 1 Worksheet 3: Time of concentration (Ta) or travel time (Tt) Projectn+�t3 CY�J�Y �---� BY V5Mg. Date Location ____ __' ,_&Q, '�, `_ +.-, pia :.1 .1:› Checked " Date Circle one: Present Developed F- ' Circle one; Tc through subarea NOTES: Space for as many as two segments per flow type can he used for each worksheet. Include a map, schematic, or description of flow segments. Sheecflow (Applicable to T only)Y) Se$menc IDS 1. Surface description (table 3-1) WCS L.1 T ;01Agi 1e.R 2. Manning's roughness coeff., n (table 3-1) e.4-c 3. Flow length, L (total L < 300 ft) ft 4. Two-yr 24-hr rainfall, PZ in Ar 5. Land slope, s ft/ft Q.•413 6. TC = 0.007 (nL)0.8 P 073 s0.4 • Compute Tt hr .7-3241 + I Shallow •concentrated flow Segment ID 13 C_ 7. Surface description (paved or unpaved) _ IIIMPAIIIIII 8. Flow length, L ft . ;-p 9. Watercourse slope, s ft/ft 0 je4_ 10. Average velocity, V (figure 3-1) Et/s ,x,. 11. Tc L 3b00 V Compute Tt hr WM + = I Channel flow Segment ID C•-P 12. Cross sectional flow area, a ft2 1t, 0 13. :=etted perimeter, pw ft t7,, (4 14. Hydraulic radius, r = e Compute r ft Pw� o.'1373 15. Channel slope, s ft/ft C.03 16. Manning's roughness coeff,, n y 17. V a 1.49 r2/3 s1/2 Ci. �� n Compute V ft/s 7.4Z- 18. Flow length, L L ft .b0© 19. T = t 3600 V Compute Tt hr 0.tZA- + _ C,.(c7,9 • 20. Watershed or subarea Tc or Tt (add TC in steps 6, 11, and 19) - hr u 4-7-11(‘ s)1 (210-VI-TR-55, Second Ed., June 1986) D•3 Worksheet 4: Graphical Peak Discharge method Project C-,Re. ..o y��,,AJ1 � By KMS Date Location AL:mip_t✓ tzi . (�,, -�'M 1(c pm( i,3E7 Checked h Date Circle one: Present Developed 1. Data: Drainage area Am = mi2 (acres/640) Runoff curve number . ... CN = (,E(t, (From worksheet 2) Time of concentration .. Tc = 0.75 hr (From worksheet 3) Rainfall distribution type = (I, IA, II, III) Pond and swamp areas spread throughout watershed = ^� percent of Am ( acres or mi2 covered) Storm #1 Storm #2 Storm #3 2. Frequency yr 3. Rainfall, P (24-hour) in Co 4. Initial abstraction, Ia in t 03c) (Use CN with table 4-1.) 5. Compute Ia/P 0.11(1 6. Unit peak discharge, qu csm/in 400 (Use Tc and Ia/P with exhibit 4- ) 7. Runoff, Q in it •3(' (From worksheet 2). C. 8. Pond and swamp adjustment factor, F (Use percent pond and swamp area p with table 4-2. Factor is 1.0 for zero percent pond and swamp area.) 9. Peak discharge, qP cfs (Where q = quAmQF ) D-4 (210-VI-TR-55, Second Ed., June-1986) v______sL -4. 00. : - ,9)0,i;%.5 _ 8Z4 d L--0 v) z. IAO-r- et-L0QC-tt — [ C-4\12.C- yth-774/4--._____ V or, i i' .. 7Retri 1 Otk.C.... Ns) ,.. o -6(.3.c 4- 1 9 Z.'S - 1 q c.-- 4 ki _.... ___________ z5 1-41. 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V, 2 m2o. 3 � � S �� a H X n X- 1/11/2017 Web Soil Survey alibiE477 ur !^� .�. .•,.__... ,, is ; j ; Area of Interest(AOI) Soil Data Explorer Download Soils Data Shopping Cart(Free) Printable Version Add to Shopping Cart) I I I I K `li I\ tm,I 9jj I ul ,F))J � scalej_(not to scafe) e Albemarle County,Virginia(VA003) Map Map Unit Name Acres Percent Unit in of AOI Symbol AOI 76 Braddock loam,2 to 7 13.6 7.2% percent slopes 7C Braddock loam,7 to 15 39.4 20.7% 111 percent slopes ' 7D Braddock loam, 15 to 25 18.3 9.6% percent slopes 9C Braddock very stony 7.7 4.0% s. � loam,7 to 15 percent I/ slopes a 1 9D Braddock very stony 3.1 1.6% loam, 15 to 25 percent slopes E "i 14C Chester loam,7 to 15 0.8 0.4% percent slopes • 36C Hayesville loam,7 to 15 2.2 1.1% percent slopes •• 38D Hayesville very stony 7.6 4.0% h loam, 15 to 25 percent slopes 66C Parker very stony loam, 0.5 0.3% 7 to 15 percent slopes •66D Parker very stony loam, 0.2 0.1% 4 , h{��; 15 to 25 percent slopes Warning:Soil Map may not be valid at this scale. 66E Parker very stony loam, 34.4 18.1% 25 to 45 percent slopes 81C Thurmont loam, 7 to 15 30.2 15.9% percent slopes FOIA I Accessibility Statement I Privacy Policy I Non-Discrimination Statement 1 Information Quality l USA.gov I White House https://websoilsurvey.sc.egov.usda.gov/App/VVebSoilSurvey.aspx 1/1