Laserfiche WebLink
<br />1 <br />' <br /> <br />' <br /> <br /> <br />' <br /> <br />' DITCH DESIGN SPREADSHEET (DITCHIT.WKQ) {M.W.BROOKS,SRK,08/24/89) <br />UTILIZING MANNINGS EQUATION FOR THE DETERMINATION OF FLOW CAPACITY <br />IN TRAPEZOIDAL, V-SECTION, AND RECTANGULAR CHANNELS <br />PROJECT TITLE: SAN LUIS PROJECT 14705 <br />DESIGN FEATURE: NORTH DFRAINAGE AREA CHANNEL IMPROVEMENTS <br />ENGINEER: G.MULLER <br />DATE: JANUARY 3 1989 <br />COMMENTS: <br /> INPUT PARAMETERS: <br /> Smi~l~ d /j'/urr.~-rl <br />' REQUIRED CAPACITY= 97.0 cfs <br /> CHANNEL SLOPE= 9.0 ~ /~so r Q, 7/ ~/~ ~/ <br /> BASE WIDTH= 20.0 ft ~` <br />~ N = Go. 03 ~S ~ <br />N = O 3 ~ <br /> TRIAL FLOW DEPTH= 0. 6 ft 3 <br />JO J <br />' FREEBOARD REQUIRED= 0.0 ft <br /> BANK SLOPE (?H:1V)= 3 :1 <br />' ROUGHNESS.COEF...... ..0:0373 ..•...•• ...•••••..,.........•.....••...•. <br /> OUTPUT VALUES: <br />1 WETTED PERIMETER= 23.67 ft FLOW WIDTH= 23.5 ft <br /> X-SECTIONAL AREA= 12.61 sq ft FROUDE NUMBER= 1.9 <br /> HYDRAULIC RADIUS= 0.53 ft FLOW STATE: supercritical <br />' FLOW VELOCITY= 7.9 fps <br /> DISCHARGE= 99.0 cfs 2 ~ extra capacity <br /> CHANNEL DEPTH= 0.6 ft satisfactory <br />t dimensions <br /> RIPRAP REQUIREMENTS: <br />' <br /> INPUT PARAMETERS: <br />1 <br />1 <br /> <br />1 <br />1 <br />UNIT WEIGHT= 165 PCF <br />OUTPUT VALUES :....................................................... <br />METHOD 1: AWWA <br />WEIGHT OF RIPRAP= 5.2 lbs <br />EQUIV. SPHERICAL <br />DIAMETER= 0.4 ft <br />5.0 in <br />ROUGHNESS COEF.= 0.035-0.045 <br />METHOD 2: USDCM <br />SPEC. GRAV. RIPRAP= 2.64 <br />d50 RIPRAP SIZE= 0.9 ft <br />11.3 in <br />ROUGHNESS COEF.= 0.035-0.045 <br />METHOD 3: MAYNARD - valid for subcritical flow <br />SAFETY FACTOR 1.0 SAFETY FACTOR = 1.5 <br />d50 RIPRAP SIZE= 0.8 ft d50 RIPRAP SIZE= 0.9 ft <br />9.2 in 10.4 in <br />ROUGHNESS COEF.= 0.035-0.045 ROUGHNESS COEF.= 0.035-0.045 <br />1 <br />