Water Loss Calculation Table • Artemis Pool Systems

Swimming Pool Water Loss Calculation Guide

Water loss in open-surface swimming pools results from several factors, primarily evaporation and backwashing processes. While environmental parameters such as solar radiation, wind speed, air temperature, relative humidity, and water surface area directly affect the rate of evaporation, operational factors—such as the frequency and duration of filter backwashing— determine the portion of water loss related to pool operation. Therefore, accurate water loss calculation is achieved by evaluating both climatic conditions and pool operating practices together.

This calculation tool provides users with a scientifically based approach to optimizing water consumption in open-surface pools. The calculations take into account pool surface area, average depth, annual temperature distribution, backwash flow rate, and backwash frequency. Based on these inputs, the system estimates the total annual water loss according to specific climate conditions and operational parameters.

The results present not only the total water loss (m³/year), but also the percentage of loss relative to the pool volume (%), the annual water renewal factor (×/year), and evaporation differences occurring during different periods (peak season and hot–dry season). These insights provide a critical reference for water conservation planning and for determining the required capacity of pool automation systems.

Criteria Considered in the Calculation

1- Pool Surface Area (A) and Depth (h):

The pool surface area and average water depth allow the automatic calculation of the total pool volume (V = A × h).

2- Climate Data (°C):

Evaporation rate varies depending on ambient temperature.

0–20 °C → 3 mm/day
20–30 °C → 6 mm/day
30–40 °C → 9 mm/day
40 °C and above → 12 mm/day

These values are determined based on average evaporation rates for outdoor pools reported in the literature.

3- Peak Season (June–July–August):

During periods when maximum air temperatures reach 40–50 °C, evaporation occurs at its highest level. Therefore, a high evaporation rate of 12 mm/day is applied.

4- Hot–Dry Season (Remaining Months):

At average temperatures ranging between 25–35 °C, evaporation is calculated within the range of 6–9 mm/day.

5- Backwash Water Losses:

Weekly backwashing operations in the filtration system (typically lasting 4–6 minutes) result in direct water loss.

6- Total Water Loss:

The total annual water loss is calculated as the sum of:

evaporation and backwash water losses.

7- Volume Ratio (%) and Renewal Factor (×/year):

Indicates the ratio of the calculated annual water loss to the total pool volume, as well as how many times per year the pool volume needs to be renewed.

How Do I Use the Calculation Report?

You must carefully enter real and up-to-date values specific to your region into the empty fields provided in the calculation report. Parameters such as ambient temperature, average humidity level, pool surface area, backwash duration, and backwash frequency directly affect the calculation results. The more accurate and regionally appropriate these inputs are, the closer the results will be to real-world conditions.

The information entered into the tool is evaluated together with local climate characteristics, pool operating practices, and system flow rates. As a result, the calculated values more accurately reflect the estimated water loss, evaporation rates, and annual renewal factor specific to the environmental conditions of your pool. With accurate data entry, you can both improve water consumption efficiency and optimize maintenance, energy, and operational costs.

WATER LOSS CALCULATION REPORT

Evaporation and Backwash Water Loss Analysis

Water loss estimation tool for open-surface pools. Please enter all required climate data.

Parameter	Value	Notes
Pool Area (A)		(m²)
Pool Depth (h)		(m)
Pool Volume (V)		(m³) Automatic
Backwash Flow Rate (Qbw)		(m³/h)
Backwash Frequency		times/week
Backwash Duration		min
Climate (June–July–August)		(°C)
Climate (Remaining 9 Months)		(°C)
Peak Season Months		months
Other Months		months
Peak Season Evaporation (Ets)		mm/day
Other Months Evaporation (Eskd)		mm/day

Calculation	Result	Unit
Peak Season Evaporation	-	m³/year
Hot–Dry Period Evaporation	-	m³/year
Backwash Water Loss	-	m³/year
Total Annual Water Loss	-	m³/year
Volume Ratio	-	%
Renewal Factor	-	×/year

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