More details are required but ...
Published by Tim Acland, Anglian Water 1977-2017
More details are required but initial considerations need to include how many point sources and local ground conditions. If porous ground then contain the discharges and aggregate them to be passed onto storage and/or treatment. If fairly impervious ground construct a ditch to collect discharges and pass to treatment. Treatment may include a settlement pond and/or a reed bed type biological cleaning stage prior to use for irrigation or recycling to home use.