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mqtivzmsyw#evie#mw#piww#xler#4/333#wuyevi#jiix/#qiermrk#xli#tvsnigx# mw#i|iqtx# jvsq#Gmx}#sj#Jsvx#Gsppmrw#hixirxmsr/#{exiv# uyepmx}/#sv#PMH#viuymviqirxw#tiv#Gmx}#gvmxivme1# CRRGPFKZ!C J[FTQNQIKE!ECNEWNCVKQPU RUNOFF COEFFICIENTS AND % IMPERVIOUS Strauss Cabin Church Subdivision, Fort Collins, CO Basin Design Pt. Composite NRCS Soil Total Total Roof (1) Asphalt Concrete (1) Gravel (1) Lawns (1) Imperviousness Type C2 C100 %I = 90% %I = 100% %I = 90% %I =40% %I=2% (%I) acres sf sf sf sf sf sf EX-WEST EX-WEST 0.54 23,598 1,481 18,462 1,641 - 2,014 90.3% C/D 0.89 1.00 EX-EAST EX-EAST 1.28 55,803 2,581 8,215 5,846 275 38,887 29.9% B 0.46 0.57 - - - - - 1.82 79,401 4,062 26,676 7,487 275 40,901 47.9% 0.59 0.73 Basin Design Pt. Composite NRCS Soil Total Total Roof (1) Asphalt Concrete (1) Gravel Lawns (1) Imperviousness Type C 2 C100 acres sf %I = 90% %I = 100% %I = 90% %I =40% %I=2% (%I) sf sf sf sf sf PR-WEST PR-WEST 0.54 23,598 1,929 18,335 1,438 - 1,896 90.7% C/D 0.89 1.00 PR-EAST PR-EAST 1.28 55,803 2,929 8,006 5,862 275 38,733 30.1% B 0.46 0.58 - 0.00 - - - - 1.82 79,401 4,858 26,340 7,300 275 40,629 48.1% 0.59 0.74 Notes: (1) Recommended % Imperviousness Values per USDCM Volume 1, Table 6-3. (2) Runoff C is based on %I and NRCS soil group per UDFCD Volume 1, Table 6-4. Proposed Total Composite Runoff Coefficients (2) Areas Existing Basins Proposed Basins Existing Total Areas Composite Runoff Coefficients (2) Date: 4/20/2020 P:\U19035 - Strauss Cabin Church\Reports\Drainage\Calculations\U19035-Drain Calcs Updated.xlsm 2-YEAR TIME OF CONCENTRATION Strauss Cabin Church Subdivision, Fort Collins, CO Basin Design Pt. Area C(1) Length Slope ti (2) Length Slope Cv Velocity (3) tt (4) Check tc? Total Length tc (5) acres ft % min ft % fps min min Urban? ft min min EX-WEST EX-WEST 0.54 0.89 105 3.5% 2.6 15 1.0% 20 2.0 0.1 2.7 Yes 120 11 5.0 EX-EAST EX-EAST 1.28 0.46 70 10.0% 4.5 0 20.0% 10 4.5 0.0 4.5 Yes 70 10 5.0 Basin Design Pt. Area C(1) Length Slope ti (2) Length Slope Cv Velocity (3) tt (4) Check tc? Total Length tc (5) acres ft % min ft % fps min min Urban? ft min min PR-WEST PR-WEST 0.54 0.89 105 3.5% 2.5 15 1.0% 20 2.0 0.1 2.6 Yes 120 11 5.0 PR-EAST PR-EAST 1.28 0.46 70 10.0% 4.5 0 20.0% 10 4.5 0.0 4.5 Yes 70 10 5.0 Notes: (1) C=Cx*Cf (2)ti = [1.87(1.1-CxCf)L1/2]/S1/3, S= slope in %, L=length of overland flow (300' max) (3)V=CvS0.5, S=watercourse slope in ft/ft, UDFCD Equation RO-4 (4)tt=L/(V*60 sec/min) (5)tc check (for urban or developed areas only) = total length/180 + 10 (6)min tc = 5 min Existing Basins Travel/Channelized Time of Flow (tt) ti+tt tc Check for Urbanized Basins Final tc (6) Proposed Basins Travel/Channelized Time of Flow (tt) ti+tt tc Check for Urbanized Basins Final tc (6) Date: 4/20/2020 P:\U19035 - Strauss Cabin Church\Reports\Drainage\Calculations\U19035-Drain Calcs Updated.xlsm 100-YEAR TIME OF CONCENTRATION Strauss Cabin Church Subdivision, Fort Collins, CO Basin Design Pt. Area C(1) Length Slope ti (2) Length Slope Cv Velocity (3) tt (4) Check tc? Total Length tc (5) acres ft % min ft % fps min min Urban? ft min min EX-WEST EX-WEST 0.54 1.00 105 3.5% 1.2 15 1.0% 20 2.0 0.1 1.3 Yes 120 11 5.0 EX-EAST EX-EAST 1.28 0.57 70 10.0% 3.7 0 20.0% 10 4.5 0.0 3.7 Yes 70 10 5.0 Basin Design Pt. Area C(1) Length Slope ti (2) Length Slope Cv Velocity (3) tt (4) Check tc? Total Length tc (5) acres ft % min ft % fps min min Urban? ft min min PR-WEST PR-WEST 0.54 1.00 107 3.5% 1.2 15 1.0% 20 2.0 0.1 1.4 Yes 122 11 5.0 PR-EAST PR-EAST 1.28 0.58 70 10.0% 3.7 0 20.0% 10 4.5 0.0 3.7 Yes 70 10 5.0 Notes: (1) C=Cx*Cf (2)ti = [1.87(1.1-CxCf)L1/2]/S1/3, S= slope in %, L=length of overland flow (300' max) (3)V=CvS0.5, S=watercourse slope in ft/ft, UDFCD Equation RO-4 (4)tt=L/(V*60 sec/min) (5)tc check (for urban or developed areas only) = total length/180 + 10 (6)min tc = 5 min Existing Basins Travel/Channelized Time of Flow (tt) ti+tt tc Check for Urbanized Basins Final tc (6) Proposed Basins Travel/Channelized Time of Flow (tt) ti+tt tc Check for Urbanized Basins Final tc (6) Date: 4/20/2020 P:\U19035 - Strauss Cabin Church\Reports\Drainage\Calculations\U19035-Drain Calcs Updated.xlsm RATIONAL METHOD PEAK RUNOFF Strauss Cabin Church Subdivision, Fort Collins, CO Basin Design Pt. Area 2-Year 100-Year acre tc tc C2 C100 I2 I100 Q2 Q100 min min in/hr in/hr cfs cfs EX-WEST EX-WEST 0.54 5 5 0.89 1.00 2.85 9.95 1.37 5.39 EX-EAST EX-EAST 1.28 5 5 0.46 0.57 2.85 9.95 1.68 7.33 3.05 12.72 Basin Design Pt. Area 2-Year 100-Year acre tc tc C2 C100 I2 I100 Q2 Q100 min min in/hr in/hr cfs cfs PR-WEST PR-WEST 0.54 5 5 0.89 1.00 2.85 9.95 1.38 5.39 PR-EAST PR-EAST 1.28 5 5 0.46 0.58 2.85 9.95 1.69 7.36 3.07 12.75 Existing Basins Totals Totals Peak Discharge Proposed Basins Runoff Coefficients Rainfall Intensity Peak Discharge RunoffIntensity Coefficients Rainfall Date: 4/20/2020 P:\U19035 - Strauss Cabin Church\Reports\Drainage\Calculations\U19035-Drain Calcs Updated.xlsm CRRGPFKZ!D FTCKPCIG!GZJKDKVU LIMITS OF DISTURBANCE FFE=4894.00 LIMITS OF DISTURBANCE EAST 1.28 0.46 0.58 WEST 0.54 0.89 1.00 3.7% 5.7% 4.5% 3.0% 2.0% 1.2% 3.5% 10.1% 5.7% 7.7% 1.4% 6.5% 25.1% 12.0% 2.3% 3.2% 32.2% 33.3% 34.3% 31.3% 22.4% 15.8% 12.5% 22.9% 5.4% 2.5% 45.0% 37.5% 4.3% 1.5% EXISTING DRAINAGE SWALE FOSSIL CREEK INLET CANAL FOSSIL CREEK CONCEPTS, LLC 04/22/2020 U19035 1" = 30' 1" = N/A STRAUSS CABIN CHURCH SUBDIVISION NORTH 4/20/2020 11:04:04 AM P:\U19035 - STRAUSS CABIN CHURCH\CADD\ET\DRAINAGE PLAN.DWG DRAINAGE PLAN KRB JRS 1 1 DRAINAGE PLAN 0 30' 60' SCALE: 1" = 30' 15' 1 LOT LINE PROPERTY BOUNDARY RIGHT OF WAY EASEMENT CENTERLINE EXISTING MAJOR CONTOUR EXISTING MINOR CONTOUR LIMITS OF DISTURBANCE LEGEND EXISTING CURB & GUTTER ASPHALT PAVEMENT CONCRETE PAVEMENT OR SIDEWALK SITE NOTES 1. EXISTING UNDERGROUND AND OVERHEAD PUBLIC AND PRIVATE UTILITIES AS SHOWN ARE INDICATED ACCORDING TO THE BEST INFORMATION AVAILABLE TO THE ENGINEER. THE ENGINEER DOES NOT GUARANTEE THE ACCURACY OF SUCH INFORMATION. EXISTING UTILITY MAINS AND SERVICES MAY NOT BE STRAIGHT LINES OR AS INDICATED ON THESE DRAWINGS. THE CONTRACTOR SHALL BE RESPONSIBLE TO CALL ALL UTILITY COMPANIES (PUBLIC AND PRIVATE) PRIOR TO ANY CONSTRUCTION TO VERIFY EXACT UTILITY LOCATIONS. 2. THE CONTRACTOR SHALL PROTECT ALL EXISTING FEATURES THAT ARE NOT TO BE REMOVED ADJACENT TO THE CONSTRUCTION AREA INCLUDING, BUT NOT LIMITED TO, SIDEWALKS, PRIVATE FENCES, ABOVE GROUND OR UNDERGROUND UTILITIES, STRUCTURES, AND UNDERGROUND FOUNDATIONS. THE CONTRACTOR SHALL BE RESPONSIBLE FOR ANY DAMAGE THAT SHOULD OCCUR TO ANY ON-SITE, OFF-SITE, PUBLIC OR PRIVATE FACILITY OR FEATURE AS A RESULT OF THE CONSTRUCTION PROCESS FOR THIS PROJECT. PROPOSED MAJOR CONTOUR PROPOSED MINOR CONTOUR GRADING X.XX XX.X X.XX X BASIN DESIGNATION BASIN AREA (ACRE) 5 - YR RUNOFF COEFF. 100 - YR RUNOFF COEFF. FLOW DIRECTION DP DESIGN POINT D1 PREPARED FOR: JOB NUMBER SHEET NUMBER OF SHEETS DATE SUBMITTED: The engineer preparing these plans will not be responsible for, or liable for, unauthorized changes to or uses of these plans. All changes to the plans must be in writing and must be approved by the preparer of these plans. NO. BY DATE CAUTION REVISIONS: VERTICAL: HORIZONTAL: SCALE 1501 Academy Ct. Ste. 203 Fort Collins, CO 80524 (970) 530-4044 www.unitedcivil.com Civil Engineering & Consulting PROJ. MGR: DRAWING NAME: PATH: DATE: TIME: DESIGNER: UNITED CIVIL Design Group LLC 04.22.20