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Drainage ReportDrainage Report for May2004 Our Saviour's Lutheran Church Exhibit C-1 Rational Formula Drainage Calculations By: PAP Grassy Areas OUR SAVIOUR'S LUTHERAN CHURCH RATIONAL DRAINAGE CALCULATIONS Area #1 Conditions DRAINAGE AREA TYPES May 2004 MBESI # 00325 EXISTING Area Runoff Coefficient (acres) 2.38 0.40 Grassy/Landscaped Areas Pavement, Building, Impervious Areas Total: 2.3780 0.400 Existinc Flow Path Description Length Slope Data Slope (ft) ~egin Elev End Elev. (%) Overland Flow 300 NA NA 3.00 131 NA NA 1.26 Proposed Flow Path Description Length Slooe Data Slope (ft) 3egin Elev End Elev. (%) Overland Flow 112 NA NA 4.00 Time of Concentration Tc Used PROPOSED Area Runoff Coefficient (acres) 0.53 0.55 0.5300 0.550 Velocity Time (fps) (min.) 0.5 10.0 1.8 1.2 TOTAL: 11 .2 Velocity Time (fps) (min.) 0.5 3.7 TOTAL: 3.7 Existin Conditions 10 min. 11 .2 min. 11.2 min. Pro sed Conditions 10 min. 3.7 min. 10.0 min. Intensity= b/ (Tc+ d)Ae Storm BRAZOS COUNTY Period Existing Prooosed Existing Prooosed Increase b d e Intensity Intensity Runoff Runoff (Year) (in/hr) (in/hr) (cfs) (cfs) (cfs) 2 65 8.0 0.806 6.0 6.3 5.70 1.84 -3.86 5 76 8.5 0.785 7.3 7.7 6.95 2.24 -4.71 10 80 8.5 0.763 8.2 8.6 7.81 2.52 -5.30 25 89 8.5 0.754 9.4 9.9 8.93 2.87 -6.06 50 98 8.5 0.745 10.6 11 .1 10.10 3.25 -6 .85 100 96 8.0 0.730 11 .1 11 .6 10.54 3.39 -7.15 By: PAP Grassy Areas OUR SAVIOUR'S LUTHERAN CHURCH RATIONAL DRAINAGE CALCULATIONS Area #2 Conditions DRAINAGE AREA TYPES May 2004 MBESI # 00325 EXISTING Area Runoff Coefficient (acres) 5.30 0.35 Grassy/Landscaped Areas Pavement, Building, Impervious Areas Total: 5.3000 0.350 Existin~ Flow Path Description Length Slooe Data Slope (ft) ~eain Elev End Elev. (%) Overland Flow 300 NA NA 3.67 345 NA NA 2.03 Proposed Flow Path Description Length Slope Data Slope (ft) 3egin Elev End Elev. (%) Shallow Gutter/Pavement Flow 289 NA NA 2.5 765 NA NA 0.7 Shallow Concentrated Flow 208 NA NA 1.89 Time of Concentration Tc Used PROPOSED Area Runoff Coefficient (acres) 3.49 0.65 3.72 0.90 7.2100 0.78 Velocity Time (fPS) (min.) 0.5 10.0 1.4 4.1 TOTAL: 14.1 Velocity Time (fps) (min.) 3.25 1.5 1.75 7.3 0.8 4.3 TOTAL: 13.1 Existin Conditions 10 min. 14.1 min. 14.1 min. Pro sed Conditions 10 min. 13.1 min. 13.1 min. Intensity= b/ (Tc+ d)"e Storm BRAZOS COUNTY Period Existing Prooosed Existing Proposed Increase b d e Intensity Intensity Runoff Runoff (Year) (in/hr) (in/hr) (cfs) (cfs) (cfs) 2 65 8.0 0.806 5.4 5.6 9.94 31 .26 21 .32 5 76 8.5 0.785 6 .6 6.8 12.19 38.26 26.07 10 80 8.5 0.763 7.4 7.7 13.74 43.09 29.34 25 89 8.5 0.754 8.5 8.8 15.73 49.28 33.55 50 98 8.5 0.745 9.6 9.9 17.81 55.78 37.97 100 96 8.0 0.730 10.0 10.4 18.58 58.21 39.63 Drainage Report for May2004 Our Saviour's Lutheran Church Exhibit C-2 Hydrograph/Pond Routing Calculations and Graphs 1 2 3 5 ff! !if! i Sf! Hydraflow Hydrographs Diagram I Project: 0325.gpw I 05-20-2004 Hydrograph Summary Report Page1 Hyd. Hydrograph Peak Time Time to Volume Inflow Maximum Maximum Hydrograph No. type flow interval peak hyd(s) elevation storage description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 Rational 7.02 1 11 6,951 ---Ext DA 1 2 Rational 2.24 1 10 2,018 - --DA 1 3 Rational 38.45 1 13 44,985 - --DA 2 w/out detention 4 Reservoir 12.24 1 31 44,977 3 294.32 28,433 DA 2w/det 5 Rational 12.24 1 14 15,419 - --Ext DA2 Proj. file: 0325.gpw I Return Period: 5 yr Run date: 05-17 -2004 Hydraflow Hydrographs by lntelisolve Hydrograph Summary Report Page1 Hyd. Hydrograph Peak Time Time to Volume Inflow Maximum Maximum Hydrograph No. type flow interval peak hyd(s) elevation storage description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 Rational 7.89 1 11 7,811 ---Ext DA 1 2 Rational 2.52 1 10 2,265 - --DA 1 3 Rational 43.30 1 13 50,659 -- -DA 2 w/out. detention 4 Reservoir 13.17 1 31 50,651 3 294.64 32,613 DA2w/det 5 Rational 13.79 1 14 17,382 - - -Ext DA 2 Proj. file: 0325.gpw I Return Period: 10 yr Run date: 05-17 -2004 Hydraflow Hydrographs by lntelisolv« Hydrograph Summary Report Page 1 Hyd. Hydrograph Peak Time rmeto Volume lnftow Maximum Maximum Hydrograph No. type now interval peak hyd(s) elevation storage description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 Rational 9.02 1 11 8,925 ---Ext DA 1 2 Rational 2.87 1 10 2,587 - - -DA 1 3 Rational 49.52 1 13 57,936 -- - DA 2 w/out. detention 4 Reservoir 14.26 1 32 57,928 3 295.05 38,070 DA 2w/det 5 Rational 15.78 1 14 19,887 ---Ext DA2 Proj. file: 0325.gpw I Return Period: 25 yr Run date: 05-17-2004 Hydraflow Hydrographs by lnteliS<>M Hydrograph Summary Report Page 1 Hyd. Hydrograph Peak Time Time to Volume Inflow Maximum Maximum Hydrograph No. type flow interval peak hyd(s) elevation storage description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 Rational 10.20 1 11 10,094 ---Ext DA 1 2 Rational 3.25 1 10 2,925 - --DA 1 3 Rational 56.05 1 13 65,581 -- -DA 2 w/out detention 4 Reservoir 15.24 1 32 65,573 3 295.44 44,007 DA 2w/det 5 Rational 17.87 1 14 22,520 ---Ext DA2 Proj. file: 0325.gpw I Return Period: 50 yr Run date: 05-17 -2004 Hydraflow Hydrographs by lntelisolvE Hydrograph Summary Report Page 1 Hyd. Hydrograph Peak rune Time to Volume Inflow Maximum Maximum Hydrograph No. type flow interval peak hyd(s) elevation storage description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 Rational 10.64 1 11 10,536 ---Ext DA 1 2 Rational 3.39 1 10 3,054 ---DA 1 3 Rational 58.49 1 13 68,433 - --DA 2 w/out. detention 4 Reservoir 15.59 1 32 68,425 3 295.59 46,253 DA2w/det 5 Rational 18.65 1 14 23,497 ---Ext DA2 Proj. file: 0325.gpw I Return Period: 100 yr Run date: 05-19-2004 Hydraflow Hydrographs by lntelisolvt i!! u 0 6 4 2 Our Saviour's Lutheran Church Drainage Area 1 - 5 Year Hydrograph Hydrograph(s) 1 to 2 QL-.:----+~--+~-+-~-+-~-+-~-l-~+-~!-=--.--~ 0. 0 3 .4 6 . 8 1 0 . 2 1 3. 6 1 7 . 0 2 0 .4 2 3. 8 2 7 . 2 3 0. 6 34 . 0 Time (min) Hyd. 1: Pre-developed Site Hyd. 2: Developed Site / Hyd . 1 / Hyd. 2 ~ u O' 6 4 2 Our Saviour's Lutheran Church Drainage Area 1 -10 Year Hydrograph Hydrograph(s) 1 to 2 OL-----4~--+~--+-~--+-~--+-~-+-~+-~~9-I--' ... 0 .0 3 .4 6 .8 10 .2 13 .6 17 .0 20 .4 23 .8 27 .2 30 .6 34 .0 Time (min) Hyd. 1: Pre-developed Site Hyd. 2: Developed Site / Hyd . 1 / Hyd . 2 Our Saviour's Lutheran Church Drainage Area 1 -25 Year Hydrograph Hydrograph(s) 1 to 2 OL-.:---+~-+~-+-~-+-~+-~~---4~--+~_.._...-.~ 0.0 3.4 6.8 10 .2 13 .6 17 .0 20.4 23 .8 27 .2 30 .6 34 .0 Time (min) Hyd. 1: Pre-developed Site Hyd . 2: Developed Site / Hyd. 1 / Hyd . 2 Our Saviour's Lutheran Church Drainage Area 1 -50 Year Hydrograph Hydrograph(s) 1 to 2 OL!::.---+~--+-~-+-~-l-~-+-~+-----~~--=J:~-i-~- 0.0 3.4 6.8 10 .2 13 .6 17 .0 20.4 23 .8 27.2 30.6 34 .0 Time (min) Hyd. 1: Pre-developed Site Hyd . 2: Developed Site / Hyd. 1 / Hyd. 2 Our Saviour's Lutheran Church Drainage Area 1 -100 Year Hydrograph Hydrograph(s) 1 to 2 Time (min) Hyd. 1: Pre-developed Site Hyd. 2: Developed Site / Hyd. 1 / Hyd . 2 ~ Our Saviour's Lutheran Church Drainage Area 2 - 5 Year Hydrograph Hydrograph(s) 3 to 5 u 20 ---------~---~--~--~--~--~--~--~--~---4 0 o ~-L~LL..I:~bd:-l 0.0 12.6 25.2 37 .8 50 .4 63 .0 75.6 88.2 100.8 113.4 126.0 Time (min) I Hyd. 3 I Hyd. 4 I Hyd. 5 Hyd. 3:Developed Site Hyd. 4: Developed Site w/Detention Hyd 5: Pre-developed Site Our Saviour's Lutheran Church Drainage Area 2 -10 Year Hydrograph Hydrograph(s) 3 to 5 ~ 30-t----+---+-~-t--~t-----it----~~~---~---~--1 u 0 204-----~~--~~---4-~----'"-~----~--~--~---- 1 3 2 6 3 g 5 2 6 5 7 8 g 1 1 04 11 7 1 3 0 Time (min) I Hyd . 3 / Hyd . 4 / Hyd. 5 Hyd. 3:Developed Site Hyd. 4: Developed Site w/Detention Hyd 5: Pre-developed Site 11'1 ~ u o· 50 40 30 20 Our Saviour's Lutheran Church Drainage Area 2 -25 Year Hydrograph Hydrograph(s) 3 to 5 o ~L-L~__JLL...J:=t:::lb:d:-J 0 .0 13 .5 27 .0 40 .5 54 .0 67 .5 81 .0 94 .5 1 08 .0 121 .5 1 35 .0 Time (min) I Hyd. 3 / Hyd . 4 / Hyd. 5 Hyd. 3:Developed Site Hyd. 4: Developed Site w/Detention Hyd 5: Pre-developed Site J!? Our Saviour's Lutheran Church Drainage Area 2 -50 Year Hydrograph Hydrograph(s) 3 to 5 60~~~~~~~~~~~~~~~~~~ 50------------~--~----~--~--~t----+-~~ 40-+--+-T-+---+-~--+-~+-----+~-t-~-+-~t----+-~~ I Hyd. 3 u 30+-+-+----++-~+-____,~____,~--+~-+~-+~-+~---t I Hyd . 4 0 20 ------~---~--~----~--~--~t----+-~~ 1 o 1Llk2s:It::~~~_J-L_J__J_J o llL.L--L~--L-..L-C:::t==t::::~..J I Hyd . 5 0 14 2 8 4 2 5 6 7 0 84 g 8 112 1 2 6 14 0 Time (min) Hyd. 3:Developed Site Hyd. 4: Developed Site w/Detention Hyd 5: Pre-developed Site .- 60 50 40 J!? t..) 30 0 20 10 0 Our Saviour's Lutheran Church Drainage Area 2 -100 Year Hydrograph Hydrograph(s) 3 to 5 ,\ I \ I \ ~ ' l 'J ~ \ ~ \ V/ ~~ ~ """""- 0.0 14.2 28.4 42 .6 56.8 71 .0 85 .2 99 .4 113.6 127 .8 142.0 Time (min) I Hyd. 3 / Hyd . 4 / Hyd. 5 Hyd. 3:Developed Site Hyd. 4: Developed Site w/Detention Hyd 5: Pre-developed Site Our Saviour's Lutheran Church Drainage Area 2 -Stage Discharge Curve ,,......, +""" Detention Pond ~ 3+-~~--+~--+-~-+-~-t----,~~--+~--1 Q) O') ro m 2+-~~--+~--+-~c.+--~-+-~~--+~--1 o----~--~--~--~----~---~-o.oo 2.04 4.07 6.11 8.15 10.18 12.22 14.26 16.29 Discharge (cfs) /Total ,.--.... Our Saviour's Lutheran Church Drainage Area 2 -Stage Storage Curve Detention Pond s 3+-~-+-~~fo--~-+-----:~~~.,__~-t-~-+-~~ Q) O') ro m 2+-~-+-~----=~~-+-~-+-~~1--~-+-~--+-~~ o--~--~--~----~--~--~--~~---~-o .0 6361 .5 1 2723 .1 1 9084 .6 25446 .2 31807. 7 38169 .2 44530 .8 50892 .3 Storage (cuft) f ' j ,. ... , ' .. • l .. ' ·- • • . . • • I ' • ' •