The slotted pipes are designed for the discharge of the rain water and oil substances (leakage) from the reinforced surfaces, i.e. dewatering the most demanding roads, motorways, class I roads, tunnels, airports, parking spaces, etc. Internal descend of pipes 0.5 % provides reliable water drain and prevents the aquaplaning occurence. The elements are dimensioned for the class of transport load D400, E600 and F900. Interrupted inflow slot guarantees the element stability even during transverse travel. The elements of profile I with continual slot are not designed for transverse travel. The system consists of several basic elements: slotted pipe with interupted slot length 4 m without interior decline or with interior decline, complete drain piece including the plastic lid (alloy mesh), sludge basket and rectification cone, cleaning piece including the plastic lid (alloy mesh), slotted pipe arched, safety fireproof lid (syphon piece), plug. Profile I slot drains are suitable for draining rainwater contaminated with small quantities of oil products (drips) from surfaced areas such as high-capacity traffic structures (motorways, dual carriageways, main roads, tunnels, runways, lay-bys, large parking lots, etc.). Profile I-1 slot drains are designed for D400, E600 and F900 class traffic loads and transversal vehicle travel. Profile I-0 slot drains and slot drains with kerbstones are designed for D400 class traffic load and no transversal vehicle travel.  The slot drains are made with the original, patented double-ring seal called Aquafest.