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PDS PLC has always offered a full design service for both bridges and roads.
PDS PLC are pleased (and in fact prefer) to carry out all Hydraulic designs on behalf of both the Designer and the Contractor. This service is free of charge on the Envirokerb bridge drainage range and on Envirodeck and Hydrodeck bridge drainage. We feel that this ensures the contract incorporates the most cost-effective and hydraulically efficient depth/width drainage unit.
It is a mistake to incorporate units that are 'over sized' in your design as they may be ineffective at obtaining a self-cleansing velocity. Establishing the correct size of unit enables products that offer cost savings over large, heavy drainage units to be installed. In our experience, a large number of contracts are designed using ineffective sizes that struggle to drain the required areas, due to the velocity of run-off being too low.
Please click here view an Example Hydraulic calculation table.