The formulas to calculate the Water Demand are:
\[ ADWD = (225 \times P) + (225 \times P \times 0.10) \]
\[ ADD = \frac{ADWD}{86,400} \]
\[ MDD = 1.44 \times ADD \]
\[ PHD = 2.3 \times ADD \]
Where:
Water demand is defined as the total water usage of an area per unit of time. Typically, water demand is calculated in terms of daily usage, or average usage per second (L/s).
Consider an example where:
Using the formulas to calculate the Water Demand:
\[ ADWD = (225 \times 1000) + (225 \times 1000 \times 0.10) = 247,500 \text{ L/day} \]
\[ ADD = \frac{247,500}{86,400} \approx 2.86 \text{ L/s} \]
\[ MDD = 1.44 \times 2.86 \approx 4.12 \text{ L/s} \]
\[ PHD = 2.3 \times 2.86 \approx 6.58 \text{ L/s} \]
This means that for a population of 1000, the average daily water demand is 247,500 L/day, the average daily demand is 2.86 L/s, the maximum daily demand is 4.12 L/s, and the peak hourly demand is 6.58 L/s.
