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assist in resolving water management problems, and also to learn more about the voluminous data which are avail. able on both surface and ground water resources in the Arkansas Valley, Other Conservancy Districts throughout the State felt the Symposium served a very useful purpose, and they in turn conducted Symposiums within their own Districts. It is expected that similar programs will he conducted, from time to time, in the future. o w ~ N COMMON CONVERSION FACTORS VOLUME 1 Acre Foot = 43,560 Cubic Feet I ^= Foot = 325,851 Gallons 1 Acre Inch = 3,630 Cubic Feet 1 Million Gallons = 3.07 Acre Feet 1 Cubic Foot = 7.48 Gallons I MiUion Gallons = 133,681 Cubic Feet FLOW RATE 50 Miner's Incbes = 1 Cubic Foot Per Second in Idaho, Kan. sas, Nebraska, New Mexico, North Dakota, Northern Califor. nia, WashingtOn and Utah. 40 Miner's Inches = 1 Cubic Foot Per Second in Arizona Southern California, Montana and Oregon. ' 38,4 Miner's Inches = 1 Cubic Foot Per Second in Colorado. 1 Cubic Foot Per Second = 449 Gallons Per Minute I Cubic Foot Per Second = 646,317 Gallons Per Day 1 Cubic Foot Per Second = 1 Acre Inch Per Hour (Approxi. mately) 1 Cubic Foot Per Second = 0.99 Acre-Inches Per Hour 1 Cubic Foot Per Second = 1.98 Acre-Feet Per Day I Million Gallons Per Day = 1.55 Cubic Feet Per Second I Cubic Foot Per Second = 724 Acre-Feet Per Year WEIGHT I Gallon of Water = 8,33 Pounds 1 Cubic Foot of Water = 62,4 Pounds \,. ;:'~~-:-:"::-":; '.-:;::,~::;.;,~"'.~:".":.-:".::~-:: . ...:.... . ... ,... :!'.' ':-.,. .' _ '.. J.. .,' ..-;. .:.... ..-. :' ,. " ,;; ~. " ..,:~ -.:. " .,..; ",.-: ~.'. ~ .",. ;.-:: .;'."_..; ~ . :::::'-..' ~: ~'.'.;'.': .t'. :...,.... ?'.. :- ,.-::' . :.... .~; ., ~' .., " r ~@~}~'1 ;".':_'-"'.::.. ,... GLOSSARY OF SELECTED WATER TERMS AQUIFER . A porous water-bearing geologic fonnation, AREA, INFLUENCE - The surface area surrounding a well, or group of wells, during pumping, within which the water table or other piezometric surface is lowered by wilhdrawal of the water. The area varies in extent with the rate and duration of pumping. BEDROCK Any solid rock underlying soil. s~nd, clay, silt, etc. .'.;..... :.- ~,', ..: f ,-,'.... CAPACITY, l\10ISTURE, FIELD - The approximate quantity of water which can be J'ermanently relained in the soil in op- position to the downwar pull of gravity. h may be expressed in percent of dry weight or in inches depth for a given depth of soil. The lenJ<:th of lime required for a soil to reach field moisture capacity varies considerably with various soils, being approximately 24 to 48 hours for sandy soils, 5 to 10 days for sih clay soils, and longer for clays. Also called capillary capacity, field .carrying capacity, maximunl -water holding.capacit)., moist- ure holding capacily, and ,lOrmal moisture capacity. See reten- tion, specific; capacily, field. CAPACITY, ,^-'ELL - The maximum rate at which a well will yield water under a stipulated set of conditions, such as a given drawdown, pump and motor or engine size. It may be ex- pressed in terms of gallons per minute, cubic feet per second, or other similar units. CYCLE, HYDROLOGIC - The circuit of water movement from the atmosphere to the eanh <lnd rcturn to the atmosphere through various staf::es or processes as precipitation, interception, runoff, infiltralion, percolation, storage, e\.aporation and transpiration. :.;:. :. ....~ .' .~ . .... :..~:;>-.;:.:::, ..... .;.. .......- .. ~: ;.. :-:,'i.'. ..~,; ..;.~ DEPLETION . ( I) The continued withdra.....al of water from a surface or ~round.water stream, reservoir, or basin at a rate greater than the rate of replenishment. (2) In appraisal work the Quantilative exhaustion of natural resources, usually in con- nection with commercial exploitation and usually recorded in monelary tenns. .',.. -, ~:;<, t 1 FLO\V, RETURN. Any flow wlllch returns to a Slream chan- nel afler diversion for beneficial use or other purposes. In irri- gation, water applied. 10 an area which is not consumed in evaporation or transpiration, and returns to a surface stream or ground.water aquifer. HYDROLOGY. The applied science concerned with Ihe waters of the earth in all its states - their occurrences, dislribulion, and circulation through the unending hydrologic cycle of: precipita- tion; consequent runoff, stream flow, infiltration, and slorage; eventual evaporalion; and reprecipil3tion. It is concerned with the physical, chemical. and physioloJ<:ical reactions of water with the rest of the earth, and its relation to the life of the earth. HYDROLOGY, GROUND.WATER . The bunch of h"dml. ogy that treats of ground water, ils occurrence and mo\.ementsi its repleni!>hmenls anJ Jepletion; the properties of rods that control ground.waler mo\'ement and stofaRe, and the methods of investir;::ation and utilization of ground water. .-.. " \{. r.;:...-:.'.... i: '~;'::.,::;:::. ,.' .. ::. '.'.~: ";". .":"".. ('.'~. :.~ .. ,<'.. .. ',;~. ., >-::.'<~.:. ~l:~~t~: ~:~ ~:....:-'\:;-': LOG, WELL. A chronolo.'tical record 01 the soil and rock fonnations which \\'cre encountered in Ihe oper,llion of sinking a well, with either their thickness, or the cle\'3tlon of the lop and oouom of each fonnalion Ri\'cn. It also u!>ually incluJcs Slatl'ments it!> 10 the litholoRic compuSltlon ;Jnu \\'.Jtcr-bc,lfing characteristics of each formation. METHOD, ELECfRICAL.ANALOGY . A method bv which the phenomena pertaining 10 one phYSical system, such as flow of water through porous media, are stuJied bv experiments in another physical system, namely Ihe flow of electricity thrlJl.Il::h :.;~. '. r ..;.... >" . ..':.-:- . -;.~ -.: _.~._-' T~':;;~:':: -~. ..-.~' :. ", '" '.~, '.,' .. ... ..,,: . .... ~.' ~.