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Hydraulic Command Center

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Manning's Equation — Open Channel Flow

Input Parameters

Channel ShapeManning's nChannel Slope (ft/ft or m/m)Bottom Width b (ft or m)Flow Depth y (ft or m)Side Slope z (H:V)Unit System

Results

Flow Area A: —

Wetted Perimeter P: —

Hydraulic Radius R: —

Velocity v: —

Discharge Q: — cfs

Rational Method — Stormwater Runoff

Input Parameters

Runoff Coefficient CRainfall Intensity i (in/hr or mm/hr)Drainage Area A (acres or hectares)Unit System

Results

Peak Discharge Q_p: — cfs

Q = C × i × A

Culvert Hydraulics — Inlet & Outlet Control

Input Parameters

Culvert Diameter D (ft or m)Headwater Depth HW (ft or m)Tailwater Depth TW (ft or m)Culvert Length L (ft or m)Manning's nEntrance Loss Coefficient KeUnit System

Results

Inlet Control Q: —

Outlet Control Q: —

Design Discharge: — cfs

(minimum of inlet/outlet control governs)

Storm Sewer Pipe Sizing

Input Parameters

Design Discharge Q (cfs or m³/s)Pipe Slope (ft/ft or m/m)Manning's nUnit System

Results

Required Diameter: — in

Detention Basin — Storage Volume Estimation

Input Parameters

Inflow Volume V_in (ft³ or m³)Max Allowable Outflow Q_out (cfs or m³/s)Storm Duration t_d (hours)Orifice Coefficient C_dUnit System

Results

Required Storage Volume: — ft³

Weir & Orifice — Flow Control Structures

Weir / Orifice Input

Structure TypeHead H (ft or m)Weir Width / Orifice Area (ft or m / ft² or m²)Discharge Coefficient C_dUnit System

Results

Flow Rate Q: — cfs

Time of Concentration — Tc Calculator

Input Parameters

Flow Length L (ft or m)Slope (%)Manning's n (overland)Rainfall Intensity i (in/hr or mm/hr)Unit System

Results

Time of Concentration T_c: — minutes

Using NRCS (SCS) TR-55 method / kinematic wave