Network modelling program – “LOOP” is a DOS based program, which do not runs by itself in Window 7. To run DOS program in Window 7, we need a DOS Emulator. An open source DOS emulator is DOSBOX which can be downloaded free from www.dosbox.com. Step by Step procedure for running “LOOP” in window 7 read more

# Calculator

# Plastic Pipe Calculator

An excellent calculator for plastic pipes covering all aspects of design. The calculator uses formula from handbook of polyethylene pipes by Plastic Pipe Institute. The link is as below; Plastic Pipe Calculator

# Partial Flow in Circular Pipes

Partial Flow in Circular Pipes Formula The velocity of flow for gravity flow is provided by mannings equation, which is as follows; Where, V = Velocity of Flow in m/s, R = Hydraulic Radius in meters, S = Slope, unitless, n = Manning’s Coefficient The circular channel running part-full is very commonly met with. The read more

# Pipe Headloss : Colebrook White

Pipe Headloss : Colebrook White Formula Formula The Darcy Weisbach Equation for calculating the pipe losses is as below; In the Darcy–Weisbach Equation, the friction factor f can be calculated from the equation of Colebrook–White. where k is the absolute roughness of the pipe wall (mm), D the inner diameter of the pipe (mm) and read more

# Runoff : Rational Method

Runoff : Rational Method Formula The Runoff from a catchment is as given below; Where, Q = Runoff in cum/hr, C = Runoff coefficient, i = Intensity of rainfall in mm/hour, A = Area of drainage district in Hectares

# Pump Power

Power of Pump Formula The Pump power is as given below; Where, P = Power of Pump i kilowatt, Q = Flow in litres/second, H = Head in meters, n = Combined Efficiency of Pumpset

# Pump : Specific Speed

Specific Speed of Pump Formula The calculation for Specific Speed of Pump is as given below; Where, nq = Specific Speed of Pump, N = Operating Speed of Pump in RPM, Q = Rate of Flow in Cu.m./sec, H = Rated Head Per Stage of Pump in meter,

# Allowable Leakage

Allowable Leakage in Pipes Formula Allowable leakage during the maintenance stage of pipe carefully laid and well tested during construction is given by: Where, qL = Allowable Leakage in Cu.cm per hour, N = Number of Joints in length D = Diameter of pipe in mm, P = Average Test Pressure during leakage Test in read more

# Ground Water Flow : Pressure Well

Ground Water Flow: Pressure Well Formula The Ground water flow in pressure well in equilibrium conditions is as follows: The discharge formula in pressure well is as given below; Where, Q = Discharge in cubic meter per day, k = Permeability meter/day, m = Depth of confined aquifer in meters, H = Depth of water read more

# Maximum Surge Pressure

Max Water Hammer Pressure in Pipes Formula The calculation for maximum Water Hammer pressure is as given below; Where, Hmax = Maximum Water Hammer Pressure in meters, C = Velocity of Pressure Wave Travel in meters/sec, V = Flow Velocity in meters/sec, The Pressure Wave Velocity is as given below; Where, k = Bulk Modulus read more

# Ground Water Flow : Gravity Well

Ground Water Flow: Gravity Well Formula The flow in gravity well in equilibrium conditions is as follows: The discharge formula in Gravity well is as given below; Where, Q = Discharge in cubic meter per day, H = Depth of water in well before pumping in meters, h = Depth of water in well after read more

# Discharge : Venturi Meter

Flow in closed conduits: Venturi Meter Formula The discharge through a venturi meter is as given below; Where, Q = Discharge in cubic meter per second, a1 = Area of pipe section in Sq meters, a2 = Area of throat section in Sq meters, h = head difference between inlet and throat section K = read more