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31	Aerial Snowpack Mapping Warksow, William L. 12 April 1975 (has links) From the Proceedings of the 1975 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - April 11-12, 1975, Tempe, Arizona / Arizona's continued growth and development depends upon sound management of water resources, especially melted snow which is the primary source of water for the 1.1. Million residents of Maricopa county. The method for snowpack information gathering practiced by watershed specialists of the Salt River project in Arizona is described. The method is outlined, describing aircraft reconnaissance, direct enroute mapping of extent and depth of snowpack, and techniques for identifying ice and/or melt conditions. Under optimal conditions, this technique is considered more than acceptable for determining snowpack levels. Limitations of the technique result from the observer's tolerance of vertigo which can arise under flying conditions; cloud cover, which can reduce contrast and shadows thereby reducing accuracy of observation; and vegetation zones where density of plant matter screens much of the snow. Hydrology -- Arizona. Water resources development -- Arizona. Hydrology -- Southwestern states. Snowpacks Snow surveys Snow management Snow cover Mapping Snow Melt water Snowmelt Runoff Snowfall Watershed management Aerial photography On-site investigations Maricopa County (Ariz) Salt River project
32	An Analysis of Yearly Differences in Snowpack Inventory-Prediction Relationships Ffolliott, Peter F., Thorud, David B., Enz, Richard W. 06 May 1972 (has links) From the Proceedings of the 1972 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - May 5-6, 1972, Prescott, Arizona / Inventory-prediction relationships between snowpack conditions and forest attributes may be useful in estimating water yields derived from snow, but such relationships are developed usually from source data collected over a short time period. Analyses of long-term data suggest inventory-prediction relationships developed from limited data may have more general application, however. Available records from 18 snow courses in the ponderosa pine type in Arizona provided source data in this study, which was designed to empirically analyze inventory-prediction relationships developed from long-term snow survey records. The primary hypothesis tested and evaluated by statistically analyzing the family of regression equations representing a snow course, was that, given a precipitation input, the distribution of snowpack water equivalent at peak seasonal accumulation is determined by the spatial arrangement of the forest cover, e.g. basal area. Generally 12 of the 18 snow courses evaluated appeared to support the hypothesis, three courses did not, and three courses were considered inconclusive. Hydrology -- Arizona. Water resources development -- Arizona. Hydrology -- Southwestern states. Runoff forecasting Snowpacks Spatial distribution Forest management Vegetation effects Arizona Forecasting Census Forests Watershed management Snow surveys Water equivalent Water yield Snow management Canopy Inventory-prediction Ponderosa pine

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Aerial Snowpack Mapping

An Analysis of Yearly Differences in Snowpack Inventory-Prediction Relationships