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Introducing impermeable areas to greenfield sites generally increases the volume of surface water runoff downstream. Even when peak runoff rates have been limited to less than greenfield rates, the actual volume would have been increased. As such, even where attenuated, the discharge will still represent an increase from the agricultural discharge rate and more particularly increase the volume of water discharged into an Internal Drainage District. Where this is the case, the Board can apply a Development Contribution as a condition of consent. By way of an example, increases in the volume of water discharged into pumped catchments could require the relevant Board to operate its pumping stations for longer to maintain the same water levels as prior to development. Alternatively, if the capacity of the station is limited this may require the widening of drains and/or the creation of new off-line storage to ensure the volume of water can be accommodated at the pump.
September 22, 2025
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