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WSP07488
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Last modified
1/26/2010 2:27:33 PM
Creation date
10/12/2006 2:25:39 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8111.805
Description
Arkansas River Compact Administration - Keesee Ditch
Basin
Arkansas
Date
1/1/1986
Author
HRS Engineering
Title
Keesee Ditch Change of Water Rights Technical Information Request Responses
Water Supply Pro - Doc Type
Publication
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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Mr. Pope and Mr. Genova <br />September 21, 1988 <br />Page thr'ee <br /> <br />Keesee Ditch <br />Monthly Maximum Irrigation Efficiency <br />(percent) <br /> <br />Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct <br /> <br />63 <br /> <br />58 <br /> <br />53 <br /> <br />58 <br /> <br />62 <br /> <br />68 <br /> <br />71 <br /> <br />71 <br /> <br />72 <br /> <br />71 <br /> <br />71 <br /> <br />68 <br /> <br />~ Request for explanation of how effective precipitation was handled in the <br />model. <br /> <br />Effective precipitation was calculated using the technique described in <br />Soil Conservation Service Technical Release No. 21 (Revised 1970). This <br />technique combines monthly precipitation with monthly potential <br />evapotranspiration calculated using the Modified Blaney-Criddle Method (same <br />reference) to estimate effective precipitation. The net depth of application <br />used for the calculation was 3.0 inches, which was assumed typical for most <br />crops. The calculated monthly effective precipitation was subtracted from the <br />calculated potential evapotranspiration to arrive at the monthly crop <br />irrigation water requirements. In the HRS Volume 1 report, page 9 further <br />describes; effective precipitation and Appendix C provides the calculation <br />results. <br /> <br />~ Request for ~ detailed explanation of water bud~et model. <br /> <br />For ~ general description of the water budget analysis and the underlying <br />assumptions, refer to the HRS Volume 1 report, pages 14-15. The water budget <br />program was developed to combine diversions, crop information, irrigation <br />water requirement data derived from the Modified Blaney-Criddle/effective <br />precipitation analysis, winter evaporation and soil moisture availability to <br />calculate irrigation water consumptive use and return flows. The following <br />assumptions and methods were used in the program and Figure 1 provides a <br />simplified flow chart of the monthly accounting. <br /> <br />- Inputs to the program included monthly diversions, monthly crop <br />irrIgation water requirements (including winter evaporation), crop <br />acreages, maximum available soil moisture capacity and maximum <br />irrigation efficiency. <br /> <br />- Monthly total available water is the sum of the beginning of the <br />month soil moisture storage and monthly diversions less delivery <br />losses. <br /> <br />Delivery losses were based on the maximum irrigation efficiency. <br /> <br />Individual crop acreages were apportioned so as to <br />maximum of 1400 acres on a percentage of total irrigated <br />basIs. <br /> <br />total a <br />acreage <br /> <br />- Consumptive use was accounted for only once during the month of <br />dIversion. either as direct evapotranspiration or as soil moisture <br />storage. Subsequent evapotranspiration of stored soil moisture in <br />
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