Shaw, Rod Removing silt manually from a drain Removing silt manually from a drain WEDC;Line drawings;Contextual;Drainage;Drain;Drains;Soakaway;International and Development Communication 2018-11-15
    https://repository.lboro.ac.uk/articles/figure/Removing_silt_manually_from_a_drain/7314713
10.17028/rd.lboro.7314713.v1