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<br />,~ : 'I. ~. ~ ".., <br />Uv ..i,t ! <br /> <br />. <br /> <br />transmissivity - the rate at which water is transmitted through a unit width of the <br />aquifer under a unit hydraulic gradient. It is equal to the hydraulic conductivity <br />multiplied by the thickness of the zone of saturation. It is expressed as gallons per <br />day per foot. <br /> <br />waterspreaders - a specialized form of surface water irrigation accomplished by <br />diverting flood runoff from natural channels or watercourses and spreading the flow. <br />The diversion and spreading is controlled by a system of dams, structures, dikes or <br />ditches, or a combination thereof, designed to accommodate a calculated rate and <br />volume of flow. Little or no manual control is needed. <br /> <br />Water spreading differs from conventional irrigation in that the timing and <br />volume of water applied are not made according to the needs of the crop. The <br />timing and volume are dependent upon the nature of the surface water runoff and the <br />infiltration capacity of the soil. A cutoff date of June I was assumed for this study <br />in Colorado and Wyoming. In Montana, North Dakota, South Dakota and Nebraska, <br />waterspreading was continued through June. <br /> <br />water table - refers to the common boundary between the saturated and unsaturated <br />zones. <br /> <br />water yield - a term relating to the total surface and <br />particular land parcel over a specified period of time. <br />hydrologic effects of forest management practices. <br /> <br />ground water runoff from a <br />It is used in describing the <br /> <br />. <br /> <br />. <br /> <br />1-13 <br />