# Flow Rate Calculation Using Hazen-Williams Equation

## How can we determine the flow rate between two reservoirs connected by multiple pipes?

Given two reservoirs connected by three clean cast-iron pipes in series with different lengths and diameters, how can we calculate the flow rate using the Hazen-Williams equation?

## Flow Rate Calculation Method

To determine the flow rate between two reservoirs connected by multiple pipes, we can use the Hazen-Williams equation. This equation takes into account the properties of the pipes and the difference in water levels to calculate the flow rate.

Calculating the flow rate between two reservoirs connected by multiple pipes involves considering the lengths, diameters, and materials of the pipes. In this case, the Hazen-Williams equation is a useful tool for determining the flow rate based on these parameters.

The Hazen-Williams equation is expressed as: Q = k * CHW * D^2.63 * S^0.54, where Q is the flow rate, k is the unit conversion factor, CHW is the Hazen-Williams friction coefficient, D is the diameter of the pipe, and S is the hydraulic gradient.

When applying the Hazen-Williams equation to each section of the pipe separately, taking into account the different lengths and diameters, the total flow rate can be determined. It is important to average the flow rates in the three pipes connected in series to get the final flow rate.

Ensure that all measurements are in consistent units to accurately calculate the flow rate. By using the Hazen-Williams equation, we can effectively determine the flow rate between two reservoirs connected by multiple pipes.