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Last modified
1/26/2010 2:21:45 PM
Creation date
10/12/2006 1:30:14 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8278.200
Description
Title I - Wellton-Mohawk
Basin
Colorado Mainstem
Date
8/1/1988
Author
USDOI/SCS
Title
Wellton-Mohawk ON-Farm Irrigation Improvement Program Post-Evaluation Report
Water Supply Pro - Doc Type
Publication
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<br />J' ~easure~ents include advance and recession of ~ater across t~e ~ie;~, so:: <br />=O:s:ure and ~ater applied. <br /> <br />~! The irrigation sJste~ distr:~ution uni:or=ity (DC), projected during <br />desigc. The D~ is so~etimes referrec to as irri~ation syste~ efficiency. lt <br />~eaSJr~s the irrigation systen's abi~ity to unifor~}y apply ~ater ~ithin t~e <br />plant root zu~€ i~ all field locations. <br /> <br />3/ The DV of the installed irrigation system is deter=ined by advance an: <br />recession of ~ater across the field or soil moisture ~easurements. Irrigatio~ <br />systems installed during the Arizona ~ellton-~ohawk On-Fare Irrigation <br />l~prove~ent Program generally function as anticipated. <br /> <br />Basin irrigation syste~s designs, on medium textured sails, were esti~ated <br />less than the a~ility of surface irrigation methods to unifornly apply large <br />flows. The continuous large flows advanced irrigation across the field ~ore <br />rapidly than traditional scalIer flo~s. Irrigation advance time on fine <br />textured soils is affected less by large turnout flows. Basin irrigation has <br />no r:.lnoft. <br /> <br />~I The Field application efficiency-management (FAt) in this table is the <br />average annual water used by the crop divided by the volu~e of water applied <br />by the irrigator during the crop year times 100. Irrigation water manage~ent, <br />ceaSurec by the FA! is generally belo~ the potential for the crops, soils, <br />water supply, water quality and the irrigation water delivery systec. FA! is <br />arl bc!ica:ion of :.he far-;:: olo.-ner, operator and/or irrigat.ors' abilit)' to <br />efficiently apply ~ater. This involves ceasuring or calculating the need for <br />~ater and applying it at the right ti~e to replace ~ater in the root zone used <br />by the crop, generally occurring follo~ing a previous irrigation. <br /> <br />Dr .ill :.y?ically be higher than the FAt. Some of the displayed FAts are <br />lo~er than expected, especially on mediu~ and fine textured soils. This ~av <br />be partially explained by water costs that were a relatively small portion ~f~~ <br />total production costs. Irrigation applications are typically on the wet side <br />in anticipation that less ~ater would lower yields. It has been sho~n on <br />alfalfa that ten percent over-irrigation results in about one-half the yield <br />red~c:.ion as does ten percent under-irrigation. <br /> <br />FAt above 75 percent usually requires ceasucing and/or calculating water used <br />by the crop since the last irrigation. ~any irrigators purchased soil <br />coisture readings using the neutron probe on selected fields. This helped <br />overcoce the tendency to schedule irrigations by tradition or using a fixed <br />frequency froc emergence to harvest. In the Arizona Wellton-~oha~k On-Far~ <br />Irrigation l=prove~ent Prograo, a raise of one percent in either the Dr or F~A <br />re5~l:.s in 8 water reduction of about one acre inch per acre. <br /> <br />-11- <br />
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