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HomeMy WebLinkAboutWPO201100089 Review Comments Stormwater Management Plan 2011-11-11*/Adequate channhIs are to be addressed b a level�s' r #t the outlet, or a channel, t the discre ' f the county inspector. �� TOPO OF EXISTING CONDITIONS AT SWM BASIN AS FIELD LOCATED ON 8/18/11 CHARLOTTESVILLE SELF STORAGE Source: Roudabush Gale & Assoc. - _ % "'' _ ehiel cess � ry - e along this route u j ect to approval by x. county inspector. dr- li dation �sraded area Rip -rap or gabi e n d i x 2A basket weir to pro ' e Low flow channel forebay -typ. Proposed D L. F. 12" ADS N -12 @ 1.5% Improvements ' Riser= Agridrain Hiekenbottorn intake perforated Riser) 12" x 35" total height) (See detail extend�p jw delight �3 0 1 uta {ions For Worksheets 2.6 le Method fersion BMP Comk� Modified SIMP Water protection Ordinance: ❑evelo� man? area_~_,._ -.. __. -..- ... _._ }rye County Water Resources Area �_� .__� Ghattesv_i11e Self w' _ _•- -- on W hale Site a Design an �t Drainage Are p 2 72 ] storm pollutant export In pounds, * 0,0090) ftvil� 1 [ L } mean runoff coefficient- Rv = 0. 05 correulion factor, small storm percent imperviousness emarle annual preclpitrvn, 43" ln'4lG a area in acres in subject dra tag phosphorus Project area m A or pp 0 5!1 }r27 pollutant concentration. g erv• area = A(l)43560[ . factor appl1ed to RR 0.5" over irnp required treatment volume inf X Lire} required remflval . LRR OOIf post) IR removal efficiency , z--* P. square fed _..__ •• -- _— . l 1 IZV ervious cover Vj a� a0t Tae t V 4 vet 752 cover 4- 20% It existin im arvipUS ca % RR Area 7YPg Areas , r t} RR - -% Gevefoprner,t Area te"Gheds MITI. values R- vela rile it p• D. I i 4 pos. " m Water 7.54 Wa- 43.72 []ri ... -�-�_. 21.86 .�3° °" "w17'k ether Rural L_ ate__ ipsr�[ouFs v ac y 2D %� Rot A ( % nmPnt Area ft For Devera ,...._ - L I t red o- R 0 39 3618? 1 G n as 18.49 1 k lnterlm Manual, page 70 other rev. 16 Feb 1998 GEB III 2 nFa l rii q# ling Results Time(min) . Inflow(cfs),. torap_e(cy) WaterEl- fi):. Discti(cfs 1.0 ,0.0 228.322 _;349.9984 232.628 350.0209 10.269 2 .0 5.145 10.271 2 .0 10.291 249.17 350.1057 0.2Ti 2 :.0 15.436 277.131 350.2446 0.287 2 ,..0 20.582 316.501 350.4315 0.299 2 .0 25.727 367.274 350.6593 0.313 2 .0 30.872 429.449 350.9209 0.329 2 '.0 36.018 503.022 351.2093 0.346 2 :.0 32.937 578.853 351.4867 0.361 2 1.0 29.856 647.806 351.7238 0.373 2 0.0 26.774 709.887 351.9267 0.384 2 1.0 23.693 765.1 352.1 0.393 2 2.0 20.612 813.448 352.2479 0.4 2 3.0 17.531 854.917 352.3721 0.406 2 4.0 14.45 889.463 352.4739 0.411 2 5.0 11.369 917.101 352.5542 0.431 1 6.0 8.288 937.827 352.6138 0.49 1 Control !IL Routing: post deu Captured Water 8L 353.766 Discharge 10.030 Inflovz 12.053 Tang r[ p [nil �s .Storac a tai wal €�., ds o ai 0.272 0.0 0.0 228.322 349.9984 0.269 2, 1.0 1.722 228.826 350.0011 0.27 2, 2.0 3.444 233.965 350.0278 0.272 2, � 3.0 5.166 242.924 350.0739 0.275 2, 4.0 6.888 255.701 350.1387 0.279 2, 5.0 8.609 272.294 350.221 0.285 2, 6.0 10.331 292.7 350.3197 0.292 2, 7.0 12.053 316.917 350.4335 0.299 2, 8.0 12.053 343.029 350.5523 0.307 2, 9.0 12.053 369.125 350.6674 0.314 2, 10.0 12.053 395.206 350.779 0.321 2, 11.0 12.053 421.271 350.8875 0.327 2, 12.0 12.053 447.323 350.9929 0.333 2, 13.0 12.053 473.361 351.0955 0.339 2, 14.0 12.053 499.386 351.1956 0.345 2, 15.0 12.053 525.399 351.2931 0.35 2, 16.0 12.053 551.4 351.3884 0.356 2, 1:1.7-n. rl 2-aS r,=--2 Q 2SAAP1 ';R9 f Hyd2: post dev captured [routed] Hydi: approx target 'CSTbdSW.W jQLL :}e ii compute out wt Time (min) I_ -�y I q s _ Njg2 -[cfs: . 0 0.0 0.0 0 0.6587 0.27 0 1.3175 0.272 0 1.9762 0.275 0 2.6349 10.279 0 3.2937 10.285 In Q9 d_. 11 Q99A input help 11 Save file get file long prn ✓ stor -ind i 101 �-M file: / //C l/ Users / gbrooks /Documents/Eng_work/Eng_work_ 2011 /CvilleSelfStorage /comp_redo_l ONov20l l /C STbasin.txt BasinFlow printout INPUT: Basin: Charlottesville Self Storage downgrade 5 Contour Areas Elevation(ft) Area(sf) Computed Vol.(cy) 348.00 1400.00 0.0 350.00 5169.00 228.6 352.00 8594.00 733.0 354.00 11465.00 1473.4 356.00 14000.00 2415.0 Start—Elevation(ft) 350.00 Vol.(cy) 228.62 4 Outlet Structures Outlet structure 0 Orifice name: riser outlet area (sf) 0.785 diameter or depth (in) 12.000 width for rect. (in) 0.000 coefficient 0.500 invert (ft) 348.000 multiple 1 discharge out of riser Outlet structure 1 Orifice name: riser inlet area (sf) 0.785 diameter or depth (in) 12.000 width for rect. (in) 0.000 coefficient 0.500 invert (ft) 352.500 multiple 1 discharge into riser Outlet structure 2 Orifice name: riser inlet file: / / /Cl/ Users / gbrooks /Documents/Eng_work/Eng_work_ 2011 /CvilleSelfStorage/ comp redo_lONov2011 /CSTbasin.txt (1 of 4)11/10/20114:23:28 PM file: / //C l/ Users / gbrooks /Documents/Eng_work/Eng_work_ 2011 /CvilleSelfStorage /comp_redo_l ONov20l l /C STbasin.txt area (sf) 0.049 diameter or depth (in) 3.000 width for rect. (in) 0.000 coefficient 0.500 invert (ft) 348.000 multiple 1 discharge into riser Outlet structure 3 Weir name: emergency spillway length (ft) 15.000 side angle 0.000 coefficient 3.300 invert (ft) 353.500 multiple 1 discharge through dam 4 Inflow Hydrographs Hydrograph 0 Modified Rational name: approx target C 0.300 Area (acres) 10.300 IDF file: al time of concentration (min) 15.00 receding factor 1.670 time increment 1.00 time limit (min) 200.00 fudge factor 1.00 storm: peak intensity (zero duration) volume (cy) 439.70 peak flow (cfs) 9.881 intensity (in/hr) 3.198 time to peak (min) 15.000 duration of peak (min) 0.00 routed false Hydrograph 1 Modified—Rational name: post dev captured C 0.800 Area (acres) 10.300 file: / / /Cl/ Users / gbrooks /Documents/Eng_work/Eng_work_ 2011 /CvilleSelfStorage/ comp redo_lONov2011 /CSTbasin.txt (2 of 4)11/10/20114:23:28 PM file: / //C l/ Users / gbrooks /Documents/Eng_work/Eng_work_ 2011 /CvilleSelfStorage /comp_redo_l ONov20l l /C STbasin.txt IDF file: al time of concentration (min) 7.00 receding factor 1.670 time increment 1.00 time limit (min) 200.00 fudge factor 1.00 storm: peak intensity (zero duration) volume (cy) 747.97 peak flow (cfs) 36.018 intensity ( in/hr) 4.371 time to peak (min) 7.000 duration of peak (min) 0.00 routed true Hydrograph 2 Modified Rational name: post dev captured C 0.800 Area (acres) 10.300 IDF file: al time of concentration (min) 7.00 receding factor 1.670 time increment 1.00 time limit (min) 200.00 fudge factor 1.00 storm: crit. duration (102 iterations) volume (cy) 1516.18 peak flow (cfs) 12.047 intensity (in/hr) 1.462 time to peak (min) 7.000 duration of peak (min) 47.29 routed true Hydrograph 3 Difference (comparison) name: check hydrograph 0 hydrograph 2 OUTPUT: Routing Method: storage- indication file: / / /Cl/ Users / gbrooks /Documents/Eng_work/Eng_work_ 2011 /CvilleSelfStorage/ comp redo_lONov2011 /CSTbasin.txt (3 of 4)11/10/20114:23 :28 PM file: / //C l/ Users / gbrooks /Documents/Eng_work/Eng_work_ 2011 /CvilleSelfStorage /comp_redo_l ONov2011 /C STbasin.txt Hydrograph 0 approx target (not routed) Hydrograph 1 Routing Summa inflow (cfs) discharge (cfs) water level (ft) storage (cy) ry of Peaks: post dev captured 36.018 at 7.00 (min) 0.588 at 19.00 (min) 352.676 at 19.00 (min) 959.509 Hydrograph 2 Routing Summary of Peaks: post dev captured inflow (cfs) 12.053 at 7.00 (min) discharge (cfs) 10.030 at 56.00 (min) water level (ft) 353.766 at 56.00 (min) storage (cy) 1375.731 Hydrograph 3 Difference (comparison) name: check hydrograph 0 approx target peak flow (cfs) 9.881 at 15.000 (min) hydrograph 2 post dev captured (routed) peak flow (cfs) 10.030 at 56.000 (min) Thu Nov 10 16:16:36 EST 2011 file: / / /Cl/ Users / gbrooks /Documents/Eng_work/Eng_work_ 2011 /CvilleSelfStorage/ comp redo_lONov2011 /CSTbasin.txt (4 of 4)11/10/20114:23:28 PM