Orifice Outlet Control Required Area Calculator FHWA Orifice Outlet Control Required Area Calculator Calculate the required orifice area for an FHWA Orifice Outlet Control with free discharge. Using: \(\displaystyle A = \frac{Q}{C_d\sqrt{2\,g\,H}}\) * Enter the design flow rate \(Q\) (cfs), head \(H\) (ft), and discharge coefficient \(C_d\). Gravitational acceleration \(g\) is taken as 32.2 ft/s². […]
Read MoreSlotted Drain Length Calculator Slotted Drain Length Calculator Calculate the required length of a slotted drain for a design flow using Manning’s equation. \[ L = \frac{Q}{\frac{1.49}{n} A R^{\frac{2}{3}}\sqrt{S}} \] * Flow depth \(d\) must be ≤ 0.18 ft. Enter the design flow rate \(Q\) (ft³/s), slot width \(b\) (ft), flow depth \(d\) (ft), slope […]
Read MoreChannel Bend Water Surface Elevation Difference Calculator Channel Bend Elevation Difference Calculator Calculate the difference in water surface elevation for a channel bend using: \[ \Delta h = K \frac{V^2}{2g} \] * Enter the flow velocity \(V\) (ft/s) and the bend loss coefficient \(K\). Step 1: Enter Parameters Flow Velocity, \( V \) (ft/s): Example: […]
Read MoreEmitter Injection Efficiency Factor Calculator Emitter Injection Efficiency Factor Calculator Calculate the efficiency factor using: \[ \eta = \frac{I_{electron}}{I_{electron} + I_{hole}} \times 100\% \] * Enter the electron injection current \(I_{electron}\) (mA) and the hole injection current \(I_{hole}\) (mA). Step 1: Enter Parameters Electron Injection Current, \(I_{electron}\) (mA): Example: 10 mA Hole Injection Current, \(I_{hole}\) […]
Read MoreRetention cum Detention Pond Storage Volume Calculator Pond Storage Volume Calculator Calculate the storage volume of a retention cum detention pond using the Double-End Area Method: \[ V = \frac{A_1 + A_2}{2} \times L \] * Enter the upstream area \(A_1\) (ft²), downstream area \(A_2\) (ft²), and pond length \(L\) (ft). Step 1: Enter Parameters […]
Read MoreReduced Peak Discharge Calculator Reduced Peak Discharge Calculator Calculate the reduced peak discharge from a retention/detention pond storage volume using: \[ Q_r = \frac{V}{\Delta t} \] * Enter the storage volume \(V\) (ft³) and the discharge duration \(\Delta t\) (s). Step 1: Enter Parameters Storage Volume, \(V\) (ft³): Example: 5000 ft³ Discharge Duration, \(\Delta t\) […]
Read MorePipe Expansion Friction Loss (Partial Flow) Calculator Partial Flow Pipe Expansion Friction Loss Calculator Calculate the friction loss in a pipe expansion under partial flow using: \[ h_f = K_{ep} \frac{V^2}{2g} \] * Enter the expansion loss coefficient for partial flow \(K_{ep}\) and the flow velocity \(V\) (ft/s). Step 1: Enter Parameters Partial Flow Expansion […]
Read MorePipe Contraction Friction Loss Under Partial Flow Calculator Partial Flow Pipe Contraction Friction Loss Calculator Calculate the friction loss in a pipe contraction under partial flow using: \[ h_f = K_{cp} \frac{V^2}{2g} \] * Enter the contraction loss coefficient for partial flow \(K_{cp}\) and the flow velocity \(V\) (ft/s). Step 1: Enter Parameters Partial Flow […]
Read MoreThru Manhole Friction Loss Calculator Thru Manhole Friction Loss Calculator Calculate the friction loss in a thru manhole under straight flow using: \[ h_f = K_m \frac{V^2}{2g} \] * Enter the manhole loss coefficient \(K_m\) and the flow velocity \(V\) (ft/s). Step 1: Enter Parameters Manhole Loss Coefficient, \(K_m\): Example: 0.4 Flow Velocity, \(V\) (ft/s): […]
Read MorePipe Expansion Friction Loss Calculator Pipe Expansion Friction Loss Calculator Calculate the friction loss in a pipe expansion under pressure flow using: \[ h_f = K_e \frac{V^2}{2g} \] * Enter the expansion loss coefficient \(K_e\) and the flow velocity \(V\) (ft/s). Step 1: Enter Parameters Expansion Loss Coefficient, \(K_e\): Example: 0.8 Flow Velocity, \(V\) (ft/s): […]
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