n the bars . On the descent of the chain the buckets are overturned and discharge their contents into a trough , from which they are removed by manual labour . The sewage , after being delivered from the pumps into the wrought - iron trough , is discharged through brick culverts into the reservoir… … set of culverts into the river . There are two tiers of eight openings in each compartment of the reservoir , the upper eight for the admis -
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