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-0 ' -i . . . 1.3 and recorders are maintained, The amounts of rain and the water con- tents of snowfalls are considered "true" measurements and are used for analysis of the spatial distribution of precipitation and the variation at each site of monthly and seasonal amounts. The recording gauges, with collection efficiencies varying from 50% to 100%, are also used to determine the temporal distribution of precipitation for each storm; the data are tabulated by hourly amounts in hundredths of an inch of water, Twelve of the recorders have time resolutions of one minute and this can be valuable in case studies, The hourly data are sent to ETI for inclusion in the SCPP data files and, for the case studies, rele- vant precipitation rates on a finer temporal scale will be available, The measurement of precipitation in the mesoscale network requires a year-round commitment, over 2,000 miles of travel per month, and during most winters, two to five days per week of field work, Because these measurements have been carried out for almost 20 years, they provide a valuable record of precipitation variations and thus provide a useful perspective for assessment of cloud seeding experiments. (2) Snow surveys, In addition to the measurement of new snow- fall following each storm, monthly cores of the snowpack at many sites are taken to determine the snow depth and water content. These measure- ments are DRI's contribution to the Cooperative Snow Survey coordi- nated by the Soil Conservation Service (SCS) and the Nevada Department of Conservation and Natural Resources. These measurements together with those made by the SCS and other federal and state agencies are available to all agencies concerned with water resources, For SCPP, the SCS SNOTEL data and complementary snow survey measurements are extremely important for monitoring increases of precipitation and assessing possible flood or avalanche hazards.