Ductulator Calculator Air duct also termed as ductulator is a passage that is used to provide fresh air into rooms, buildings etc., Air ducts may be in circular, square and in rectangular shapes. This online air duct calculator is used to calculate the velocity of air flow feet per minute (FPM), and feet per second (FPS) through any shaped ...

Simple to use Ohm's Law Calculator. Calculate Power, Current, Voltage or Resistance. Just enter 2 known values and the calculator will solve for the others.

Management Manual) for the shallow concentrated flow that normally develops within 100 to 300 feet into the watershed, after overland sheet flow. The NRCS method involves calculation of the velocity of the shallow concentrated flow based on information about the slope and the type of surface. Download free Excel spreadsheet templates for Darcy Weisbach equation/pipe flow calculations. Frictional head loss and pressure drop can be calculated for given pipe flow rate, pipe diameter and length, pipe roughness, and fluid density and viscosity.

segments: 1- sheet flow, 2- shallow concentrated flow, and 3- channel flow. Sheet flow travel time is likely to be the dominant component of the time of concentration for small watersheds. At the same time, sheet flow estimation procedure is the most subjective and theoretically questionable of the three. Select a media, enter your data and let the calculator do the rest. It features conversion calculators to help you convert between metric & imperial values. Download free Excel spreadsheet templates for Darcy Weisbach equation/pipe flow calculations. Frictional head loss and pressure drop can be calculated for given pipe flow rate, pipe diameter and length, pipe roughness, and fluid density and viscosity. T t = travel time for flow regime of interest (hr) - sheet, shallow concentrated, or channel flow. V = average velocity of water in each flow regime (ft/s). For channel flow, our calculation allows you to input the type of channel and the cross-section dimensions. Channel flow information is used for computing channel travel time. For example, if the open area of the perforated sheet is 30%, it means that 30% of the sheet is holes and 70% of the sheet is material. As our customers request, we list the way of open area formular for calculation of perforated sheet with round, square, slot and hexagon holes in straight or staggered row.