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OOHG8 est vegetation following timber barvest or other dis- turbance. remote sensing - collection of information or data about certain objects or conditions from a distance without physical contact. Examples are aerial pho- tography and satellite-borne sensor systems. reservoir inflow - a record of streamflow into any of the man-made reservoirs, given in acre-feet per month. return flow - that portion of the water diverted for a beneficial use that returns to the stream system for potential rediv€rsion or in stream uses. return flow distribution pattern - a temporal pattern which distributes the total return flow from a partic- ular month's activity over the next 12 months on a monthly percentage basis. It recognizes that return flow is not instantaneous, but rather is logged over a period of time. response curve - is a curve showing the relation be- tween pumping time and volume of stream depletion. rounding - the process of adjusting a numeric value according to some rule. run - the execution of a computer program or routine. software - computer programs and documentation. specific yield of an aquifer - the change that. occurs in the volume of water in storage per unit area of unconfined aquifer as the result of a unit change in head, expressed as a dimensionless ratio to the de- watered volume or the drainage porosity. storage - pertaining to a device into which data can be entered, in which they can be held, and from which they can be retrieved at a IHter time. stream depletion - either a direct depletion of the stream or reduction of ground water flow to the stream as a result of pumping a well in units of acre-feet. stream depletion factor (SDF) - defined as of ' which has a dimension of time with "a" the distance from the well to the stream in feet, "S" the specific yield and "T" t.he transmissivity. The SDF has a unit of time and is the result of analyzing aquifer properties such as transmissivity, specific yield, and well loca- tion. When the well is pumped continuously and when the volume of stream depletion reaches 28 percent of the total volume pumped, t.he pumping time would be approximately equal to one sdf at the well. subroutine - a part of a computer program. surface water irrigation - irrigation utilizing water diverted by gravity systems, pumped from lakes or streams, or supplied from surface reservoirs. terraces - an earth embankment, a channel. or a com- bination ridge and channel constructed across a slope. lest site - a specific location where classification tech- niques and ground truth informat.ion for a remote sen- sing study are evaluated and modified prior to implementation of a !luger scale operational study. transmissivitv - the rate at which water is transmit- ted through;' unit width of the aquifer under a unit hydraulic gradient. It is equal to the hydraulic con- ductivity multiplied by the thickness of the zone of saturation. It is expressed as gallons per day per foot. waterspreaders - a specialized form of surface water irrigation accomplished by diverting flood runoff from natural channels or watercourses and spreading the flow. The diversion and spreading is controlled by a system of dams. structures, dikes or ditches, or a com- bination thereof, designed to accommodate a calcu- lated rate and volume of flow. Little or no manual control is needed. ' Wa\erspreading differs from conventional irrigalion in that the timing and volume of water applied are not made according to the needs of the crop. The tim- ing and volume are dependent upon the nature of the surface water runoff and the infiltration capacity of the soil. A cutoff date of June 1 was assumed for this study in Colorado and Wyoming. In Montana, North Dakota, South Dakota and Nebraska, waterspreading was continued through June. water table - refers t.o the common boundary between the saturated and unsaturated zones. water yield - a term relating to the total surface and ground water runoff from it particular land parcel over a specified period of time. It is used in describing the hydrologic effects of forest management practices. 11