PLUV is an autonomous rainwater collection tank for allotment gardens. Rainwater is collected by a water funnel-roof and stored in a polyethylene cistern. The water is used in situ for watering plants, gardens and vegetable gardens. This device is installed on natural ground and does not require earthworks. Large staked support plates ensure stability in bad weather. An overflow system is integrated into the tank to relieve excess water, in the event of overflow. The system purges itself automatically in the event of severe frost. The valve can be fitted with a padlock to control the access of water. Benches are arranged on either side to create a social spot in the shade.