Published on 05 May 2020
About this good practice
The object is located in the territory of State JSC “Latvian Road laying Maintenance Company” (LAU) Tukums District Branch in Kandava. The company manages state roads. In summer roads are graded, but in winter covered with salt and sand. Service vehicles have to be washed regularly. Before rainwater treatment plant installation service vehicles were washed with drinking water, but dirty water was discharged into the pound without any purification. In the year of 2012, 20 m3 of storage tanks were reconstructed and rainwater treatment plants with a capacity of 15 l/s and sand catcher 5 m3 were built. Purified water is reused for washing car equipment with a Karcher-type unit with a capacity of 0.25 l / s. About 800 liters of water are consumed per unit. The number of units and the required water consumption were obtained from LAU. After rainwater treatment plants and storage tanks installation, the company savings on drinking water are around 600-700 EUR per year. As rainwater treatment plants are regularly cleaned, not just rainwater is reused for service vehicle car wash, but also, side product – accumulated sand is used in winter for road (anti-slippery) treatment.
The construction costs in 2012 were 4571 EUR. Reconstruction project price 1707 EUR. Construction work was carried out by company employees.
Evidence of success
After stormwater treatment plants and storage tanks installation, the company savings on drinking water are 4089 EUR per six years. The company no longer pays a fine for environmental pollution and stormwater is reused in a sustainable way.
Potential for learning or transfer
This good practice has already been implemented by several LAU organizations and there are currently 2 LAU units in the process of developing the project. Rainwater can be collected, treated, and reused several times. Service vehicle car wash with rainwater saves drinking water resources. Also, after treatment rainwater can be stored in the pond and used for firefighting.