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<br />N <br />.+-:... <br />r"" <br />00 <br /> <br />required a stilling well in many instances, required excessive power to <br />operate by battery for extended periods and dld not meet head-detection <br />accuracy requirements. The most economical approach presently available to <br />adequately monitor 'a number of water levels in the same proximity appears to <br />be a recently'introduced data'logging system (Easy Logger by OKNIDATA) couRled ' <br />with a bubbler/pressure transducer system rteveloped ,at the U.S. Water. "~ ," <br />Conservation Laboratory. BarteK, Inc., presently manufactures a waterleve1 <br />sensing system, based. on an acoustical (shock wave) ~ransducer that is simple' <br />to ,use in tl1e. ,field,',excee4s accUracy requirements but in its present form is' <br />too costly. The "company is interested in developing a unit that includes ,a <br />single sensor/logger with simplified electronics mounted directly on ,the side <br />of a concrete lined canal, without a 'stilling well. The expected marketing <br />price of such a unit is $750 or less if the development, manufacturing and <br />tOOling costs were defrayed by 'the ,Government or other interested entities; <br /> <br />~riculturalEnRineerinR Research Center <br /> <br />The prineipal research thrust of the Fort Collins group in ,1984 'was to better, <br />characterize tl1e infiltration cl1aracteristies of Grand Valley ,soils in order <br />to improve design and management of graded furrows. 'The,recirculating' <br />infiltrometer was developed, tested, and found to function well. It will be <br />used to study effects of controlled conditions, such as stream size; wetted ' <br />perimeter, water quality, tillage praetiees, etc., on infiltration. <br /> <br />The zero-inertia . model for furrow flow simulation was made operational on a", <br />'Wang 2200 computer system. Hodel simulations will 'be used to c~eckthe _ <br />,validity of infiltration predictions to improve furrow:irrigation efficieney. <br />Advance and infiltration 'data were collected on three' eOl1llllon soil tyPes for' <br />model verifi~ation and, for 'use in estimating spatial variability of infiltra- <br />tion. <br /> <br />The hydraulic weighing lysimeters were used in 1984 to develop a method by <br />whicl1 remotely sensed data ean,be used to estimate evapotranspiration (ET) of <br />agricultural crops., Refleeted visible and near-infraredeanopy radiation from <br />eorn Was: measur;addally . with a'three"-band radiometer. Measured values"were" , <br />"related to ,measured ETand :cliinatEidata to develop real time 'crop' coeffic.ients. <br /> <br />Snake River Conservation Research Center <br /> <br />The Kimberly group developed electronic open channel flow logging equipment <br />whieh is now being used in both Grand Valley and Unita Basin SCS monitoring <br />programs. <br /> <br />Three cablegation systems in the Grand Valley were monitored throughout the <br />1984 season. On one system, the farmer raised 185 bushels per acre of eorn <br />with 23 inches of infiltrated water, in spite of one-third of the field being <br /> <br />-21- <br />