<br />001933
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<br />TABLE OF CONTENTS
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<br />LIST OF APPENDiCES......................................................................',.....,......................,........ V
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<br />LIST OF T ABLES.................,.........................................................................,......................... VI
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<br />LIST OF FIGURES .................................................................................................................. VII
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<br />CHAPTER 1 - OVERVIEW .............................................,...........................................................1
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<br />San Juan RIP Background ...,.....,.....,..,..,.....,...........,..........,........,.....,.......,.....,................1
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<br />Overview of Hydrology Modeling ....,.....,....",........,..,....".....,.....",..,.."....,.,........"..,'.......,,1
<br />Hydrologic Simulation Analysis. ,...."..,.. .........,....,... ,..............,.,..'.."........'.....,..,....... 1
<br />Computer Modeling tools........................., ,.......,.."....",...."............,...."...,....,..,',..... 1
<br />Natural flows and Historic Depletions ,............,............,.......,..,.....,..,.............,..,......,2
<br />Model Validation and Calibration...........,...."......."..,..,..,......",....,.."..,...."...."..,......2
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<br />Operating Rules,...,..,..,..",............"..,.. ..,....",..."...,........,.....",..,..,.....".,..,.,..",..,....2
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<br />Overview of Hydrology Modeling Documentation ...............,....................,......................,..3
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<br />Two Documents.,......"",..,.. ,.. ,.... ,....'".... ,........,..',.. ,..,..,..,..,..'"..,.."".."",..', ,.."...",3
<br />Contents of This Document.....,.................." .................."..""...,..,...",..,..",....",."..,3
<br />Natural Flow and Historic Depletion Analysis ....,..,.............,............................3
<br />Computer Based Modeling Tools ,.........,......,....................,..,..,.........,............,3
<br />Model Input Data and Operating Rules .................,................,....,....,..............3
<br />Model Calibration and Verification..,.."......."....".."..,...."""..",....,..."..,...,.."..3
<br />Simulation Scenarios and Model Runs,....,......................,..,........,...................3
<br />Analysis of Model Output ...."....,.....""...".."..,...."...,..".....".....,..,..,',......,...,..3
<br />Model Limitations and Recommendations..........,.."...""...."....,........"...,.."..,,3
<br />States' Qualifications and Objections ............,............................,..,....,......,....,3
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<br />CHAPTER 2 - NATURAL FLOW AND HISTORIC DEPLETION ANALYSIS .............................4
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<br />USGS Stream Gages in the San Juan River Basin..,.........................,............................,..4
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<br />Historic Depletions."......,..,.,....,.."",......"",.... ,..........,..."..,."...""..".,.....,......,....,",.....,. ,1 0
<br />Irrigation Depletions .... ,...............,......",......., ,.......... '.....',..,...'""......,.."""",..."',.. 10
<br />Consumptive Irrigation Requirement (CIR) Methodology ..............................10
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<br />Climate Data"",......""..,....,..,..,..,............. ,.....,...,.......""...".... ,..",....,..,.,..... 13
<br />Crop Growing Seasons ..,.........................,....,..........,..,...,.........,..,..".."...,..,'14
<br />Irrigated Acres and Cropping Patterns .....,....,.....................................,.........18
<br />Distribution of County Crop Data...............,....,............,........,........,........,......19
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<br />Shortages....,........., ,...................'..",..",..'..,...,..".. ,.. ,..,..'"",..,........,.,....",.. .20
<br />Sprinkler Evaporation ",," ,."""." ,.. ,..... ,..." ,. "."... ,.... ". ,.., '" ,."",."",., '...'"",. ,20
<br />Proportioning Unit Irrigation Depletions to Gauging Stations ..,........,........,....20
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<br />Ground Water Storage.",.......".. ,....".,....""",..,...,..,.....".....",...,"',.,..."..,.., ,23
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<br />DRAFT - SJRIP Hydrology Model Documentation
<br />June 18. 1999
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