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Cascades and stream built in Clapgate, Herts. The brief here was 'build whatever you want'! Mr and Mrs Blakeman wanted a low maintenance pondless water feature. A below ground reservoir holds 200 gallons of water & can be built to harvest roof rainwater.  - Landscaping and Water Features -  Creative Cascades Cascades and stream built in Clapgate, Herts. The brief here was 'build whatever you want'! Mr and Mrs Blakeman wanted a low maintenance pondless water feature. A below ground reservoir holds 200 gallons of water & can be built to harvest roof rainwater.