Our contribution briefly introduces the Methodology for the assessment of sediments, which was certified by the Ministry of agriculture of the Czech Republic under the registration number 13084-2017-MZE-15000. The Methodology finds its use especially among the managers and owners of various water works, reservoirs, and ponds, but also project architects and implementation companies who come across and need to resolve many sediment-related problems. The Methodology also serves as a basic introduction into the problematics of reservoir sediments, but primarily offers the correct and most effective procedures, which should ensure significant savings and eliminate potential risks.