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4.1.4 "Flow Rate" means instantaneous flow, usually expressed in gallons per minute <br /> ("gpm") or cubic feet per second ('cfs"). <br /> 4.1.5 "Groundwater" means any water not visible on the surface of the ground under <br /> natural conditions, as defined in section 37-90-103(19), C.R.S. <br /> 4.1.6 "Headgate" means a structure sufficient to control the rate of Diversion of water <br /> at all ordinary stages, as more fully described in section 37-84-112(1), C.R.S. <br /> 4.1.7 "Inactive Diversion Structure" means a Diversion Structure for which a Water <br /> User files an affidavit, on a form prescribed by the State Engineer, with the <br /> Division Engineer declaring the Water User's intent to not use the Diversion <br /> Structure for any Diversion or water application purpose, as more fully described <br /> in Rule 9. <br /> 4.1.8 "Measuring Device" means a Measurement Method that is a permanently- <br /> installed device, such as a flume, weir, staff gage associated with a stage-storage <br /> curve, or totalizing flow meter, including a totalizing flow meter that may be <br /> removed in the winter when the structure is not in use, used to directly determine <br /> the Flow Rate, Total Volume, or volume of water diverted, stored in a Reservoir, <br /> released from a Reservoir, or delivered for any purpose within the standards of <br /> accuracy identified in these Rules. <br /> 4.1.9 "Measurement Method" means a method used to determine the Flow Rate, Total <br /> Volume, or volume of water diverted, stored in a Reservoir, released from a <br /> Reservoir, or otherwise delivered for any purpose within the standards of <br /> accuracy identified in these Rules, and includes Measuring Devices and <br /> Alternative Measurement Methods. <br /> 4.1.10 "Notice," "Notify," or"Notification" to the Division Engineer means submission <br /> of a written message to the Division Engineer by mail or email, or the submission <br /> of a completed form or other format prescribed by the State Engineer where <br /> specifically required by these Rules. <br /> 4.1.11 "On-Stream Reservoir" means a Reservoir that is located on a natural stream. <br /> 4.1.12 "Off-Stream Reservoir" means a Reservoir that is located such that a natural <br /> stream does not flow through the Reservoir and the Reservoir fills by diverting <br /> water from a natural stream by means of a control structure, ditch, canal, flume, <br /> bypass, pipeline, conduit, well, pump, or other structure or device, or is filled by <br /> spring water, stormwater runoff, precipitation, or return flows, including effluent. <br /> 4 <br />