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<br />. <br /> <br />. <br /> <br />001870 <br /> <br /> <br />soils. The trenches are aligned in random patterll, but it was noted that <br /> <br />in charcos having ,a north-south alignment, which is about normal to the <br /> <br />prevailing wind direction and which ~lso should give the least solar radi- <br /> <br />ation, an,d having the spoil bank on the windward side, the water level on <br /> <br />the average was from 1 to 2. feet higher than in.other ponds. It was re- <br /> <br />ported that an ponds had been fuU a,bout 3 months earlier during the <br /> <br />spring snowmelt. Abo, there appeared to be little difference inthe <br /> <br />seepage in any of the ponds as the rate .of recessil)p. in all ponds not <br /> <br />aligned normal to the prevailing wind was aboat equivalent to the <br /> <br />measured pan evaporation in the vicinity. Thus, the reduced evapo;r- <br /> <br />ation appeared to be directly at,tributable to reduc~ solar radiation <br /> <br />and to partial insulation from the wind currents resulting from the <br /> <br />position of the spoil bcyk. <br />Suppression o{ evaporation by the applicatidn of monomolecular' <br /> <br />films has been the object of consideraple research in recent years. <br /> <br />Procedures for applying the film and some of the results obtained in <br /> <br />reducing evaporation have been described in the literature and will <br /> <br />be mentioned only briefly. <br /> <br />The mos~ widely used compound is a~cetyl alcohol, hexadecanol, <br /> <br />a wax.like sO.lid, insoluble in water, but forming a film on the water <br /> <br />surface one molecule in thickness when disp.ensed in the water. <br /> <br />Several other related compounds have been tested, the most c.ommon <br /> <br />49 <br />