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<br />- 6 - <br /> <br />The monthly rainfall for this area in the Duero river valley is ac~ording to <br /> <br />Table 1. <br /> <br />TABLE 1. - Monthly precipitation data for the Duero <br />basin for the months January through May <br /> <br /> Jan. Feb. Mar. Apr. May : Monthly <br /> . Average <br />Monthly Precipitation (mm) 47 43 50 37 42 44 <br />No. of days with precipitation: <br /> Valladolid 11 10 11 9 8 10 <br /> Salamanca 10 10 lO 8 7 I 9 <br /> <br />~ <br /> <br />There are 90 rain gauge stations and 9 recording gauges in the area. The fr:equency of <br />occurrence of clouds is according to Table 2. <br /> <br />TABLE 2 - Frequency of occurrence of clouds with <br />vertical development at Villanubla for <br />the months January through May <br /> <br /> , , <br /> Jan. Feb. Mar. I Apr. May Aver~ge days <br /> per: month <br />No. of days per month wiLh <br />low or middle clouds 25 23 26 26 26 25 <br />No. of days per month with <br />clouds of vertical develop- 1 <br />ment 3 4 7 9 10 6 <br /> <br />Radio sonde stations are in Villanubla (Valladolid airport), Madrid, Palma, ~ibraltar, <br />Lisbon, La CoruDa, and Bordeaux. <br /> <br />3.3 The Precipitation Enhancement Experiment <br /> <br />3.3.1 Description: Despite the unknown outcome of SSP-3, with its informat:ion on cloud <br />systems and cloud microphysics - which will determine the operational plan for PEP - one <br />can nevertheless make a series of statements about the type of experiment being considered <br />with some of the points just repeating already-stated objectives: <br /> <br />(a) The Plan is to test a technique which utilizes the addition of ice crystals to super- <br />cooled clouds for the purpose of enhancing precipitation. <br /> <br />(b) The clouds considered are those associated with cyclonic activiLY. The associated <br />airmasses could be either maritime or continental. <br /> <br />(c) The direct target area is about 104km2 with a total experimental area available for <br />,controls and the study of extended area effects of approximately 5 x 104km2. <br /> <br />(d) Intervention with the rain-forming process generally is to be accomplished by the <br />release of AgI from aircraft, either from burners or by droppable flares. The use of <br /> <br />~ <br />