IBCC (Interbasin Compact Committee) – The Interbasin Compact Committee (IBCC) was established by the Colorado Water for the 21st Century Act to facilitate conversations among Colorado’s river basins and to address statewide water issues. Composed of 27 members.
Instream Flow – water flowing in a natural stream bed; water required for maintaining stream flow or for fish.
Integrated Decision Support Consumptive Use (IDSCU) – an efficient model for computing field & farm consumptive use.
Interruptible Water Leasing – authorized by state statute in 2003, a method by which farmers are allowed to lease water to cities during drought emergencies.
Irrigation Allotment Contracts – legal documents used to provide augmentation to member wells. Also known as Class B, C and D contracts.
Leaching – the downward transport by percolating water of minerals into a soil.
MOU (Memorandum of Understanding) – Document signed between government entities to formally state a position or plan of action.
Nontributary Groundwater – groundwater outside of the boundaries of any designated groundwater basin, the withdrawal of which will not, within one hundred years, deplete the flow of a natural stream at an annual rate greater than one-tenth of one percent of the annual rate of withdrawal.
Not Nontributary Groundwater – Denver Basin groundwater, the withdrawal of which will deplete the flow of a natural stream at an annual rate of greater than one-tenth of one percent of the annual rate of withdrawal.
NWRA (National Water Resources Association) – National water lobbying organization located in Washington, DC.
Priority – the ranking of a water right in relation to all other water rights drawing on the same stream system. Priority is determined by the year in which the application for the water right was filed.
Prior Appropriation – the water law doctrine that confers priority to use water from natural streams based upon when the water rights were acquired. Also referred to as “First in time, first in right”.
Quota – defines the percentage of well usage on each member contract. This amount is determined annually by the Board of Directors.
Recharge – the process of adding water to an aquifer by injection or infiltration. Dug basins, injection wells, or the simple spreading of water across a land surface all are means of artificial recharge.
Return Flow – water that returns to streams and rivers after it has been applied to beneficial use. It may return as a surface flow, or as in in-flow of tributary groundwater.
Riparian – referring to land or habitat immediately adjacent to the stream channel.
SPWRAP (South Platte Water Related Activities Program) – an organization created to help expedite the process of obtaining permits.
Substitute Supply Plan – a State Engineer approved temporary plan of replacement supply allowing an out-of-priority diversion while a plan for augmentation is proceeding through the water court.
Three-States-Agreement – documents signed by the governors of Nebraska, Wyoming, and Colorado to use a basin-wide approach to protect endangered species in central Nebraska.
Transmissivity – a measure of the ability of an aquifer to transmit water.
Tributary Groundwater – all subsurface water hydraulically connected to a surface stream, the pumping of which would have a measurable effect on the surface stream within one hundred years.
Water Right – a property right to the use of a portion of the public’s surface or tributary groundwater resource obtained under applicable legal procedures.
Glossary Definitions taken from the Denver Water Community Relations publication “Denver Water Glossary of Frequently Used Water Terms”, published 2001 and the Colorado Foundation for Water Education’s Citizen Guide “Colorado Water Law”, 2nd edition, published 2004.
A more comprehensive glossary can be found at: The Groundwater Foundation