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Bulbourne river at Berkhamsted Silting What might be regarded as the final insult to the river, was that as Berkhamsted grew surface water drainage was discharged into the river. These large surface water drainage pipes can be seen in the river banks of the town stretch  at regular intervals along its length.                            Apart from being an ugly unnatural feature these pipes bring in oil and silt from the roads. The silt settles on the gravel, making it unsuitable for fish hatching;  oil floats on the surface, blocking the oxygen necessary for a healthy ecosystem.                                * * * * *                 Drain on St Johns Well Lake