Evaluation of Agricultural Adjustment to Irrigation Water Salinity: A Case Study for Pinal County,Arizona.

摘要

The primary purpose was to develop a methodology for watershed managers to use in resource development and conservation decision making. Stochastic event-based precipitation models were derived to serve as inputs into deterministic watershed models with the result that a time series of hydrologic outputs could be obtained. These outputs,water and sediment yields and peak flow rates,could then be used to reflect the extent of man's activities in modifying the environment,as well as,for the optimal design and operation of water control facilities. The effort was directed for moderate-sized watersheds where little or no streamflow data was available,but precipitation information could be obtained from onsite or nearby locations. A variety of problems were modeled by this approach,such as,predicting snowmelt runoff,modeling hydrologic effects of land use changes,stochastic analyses of water yield increase from vegetation management,and the design of floodwater retarding structures. The project demonstrated that inventory control techniques could be adapted for obtaining an optimal irrigation policy, i.e.,one that maximizes net returns to farmers.