to the pit itself the spray nozzles 24 may be arranged at any selected spacing thereby to enable maximum saturation per volume of air immediately over the reserve pit surface in accordance with the invention an aeration wall 30 is used in surround of the reserve pit 10 in order to provide accelerated aeration and evaporation of the reserve pit fluid the aeration wall 30 may be used alone or in combination with the spray conduit 22 in an attempt to absolutely maximize liquid saturation in the area immediately over the reserve pit 10 thereby to maximize elimination speed in drying up the pit the aeration wall 30 may be fed by input directly off of spray conduit 22 from liquid pump 20 thus such as a pipe section 32 e g two inch pipe may be connected to extend up to the upward extremity of the aeration wall 30 referring to fig2 and 3 the aeration wall 30 consists of a plurality of end aligned drying panels 34 the panels 34 are supported in surround of reserve pit 10 by means of a plurality of periodically positioned supports or posts 36 as driven into the earth at the inside base of dike 12 it is contemplated that the posts 36 take the form of a generally square metal post having formation of slot indentions on two opposed sides thereby to seat or receive respective panels 34 many variants of this design are possible but it seems desirable to include the function of panel retention the drying panels 34 are utilized in such as 4 foot u00d7 8 foot panels and they are supported between adjacent posts 36 and a horizontal brace 42 connected therebetween near ground level a reduced diameter distribution pipe 44 having a large plurality of.