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Last modified
9/26/2011 8:33:25 AM
Creation date
7/2/2008 9:35:31 AM
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Decision Support Systems
Title
RGDSS Task 4 - Basin Interviews
Description
Memo documenting interview with Manassa Land and Irrigation Company.
Decision Support - Doc Type
Task Memorandum
Date
6/21/1999
DSS Category
Surface Water
DSS
Rio Grande
Basin
Rio Grande
Contract/PO #
C153863
Grant Type
Non-Reimbursable
Bill Number
HB98-1189, SB99-173
Prepared By
Leonard Rice Engineering
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can be difficult to manage. If or when canal capacity is an issue, the Company gives priority to <br />direct flow water over water released from storage. <br />Water Measurement <br />Water is measured at each point in the river where the Company diverts. The Manassa No.3 <br />headgate has a continuous recorder, and was equipped with a satellite communications system in <br />1999 (part of the RGDSS surface water gaging activities). Diversions through the other diversion <br />structures (Manassa Eastfield and Manassa Westfield) are measured using Parshall flumes and <br />staff gages. In addition, there are measuring devices (staff gages) at every major lateral and at <br />individual turnouts along the ditches. <br />Geographic Location and Size of Service Area <br />The Company service area is primarily located in an area to the north of the north branch of the <br />Conejos River. There are approximately 18,760 acres irrigated under the Manassa Ditch system. <br />The Manassa system represents approximately 22 percent of all lands irrigated in the Conejos <br />District. <br />There are approximately 1,700 acres irrigated by the Company located on the south side of the <br />Conejos River and these lands are provided water diverted through the Heads Mill Ditch under <br />certain conditions.. Once the Company's No. 48 priority is in for at least 38.6 cfs, 30 cfs of the <br />No. 2 priority maybe delivered to these lands (known as the Finley Ranch) via the Heads Mill <br />Ditch. <br />Laterals <br />Water diverted from the Conejos River is delivered through one or more of five lateral systems <br />operated by the Company. These laterals include: <br />• Bountiful Lateral <br />• East Lone Star Lateral <br />• West Lone Star Lateral <br />• Main Manassa Canal (Manassa No. 3 Ditch) <br />• Eastfield Lateral <br />A sixth lateral, the Westfield, can be used to run water into the Main Manassa Canal prior to any <br />water deliveries to share holders. The locations of laterals are shown in Attachment 1. <br />Water Allocation Among Owners <br />Water under the Manassa system is delivered to share owners on a rotational basis. The <br />Company begins the rotation at the start of the irrigation season on a different lateral each year. <br />Water is delivered to each owner at an irrigation stream of about 7 cfs. The duration of this <br />delivery stream is dependent on the number of shares owned. A stream is delivered for a period <br />ranging from 4 to 12 hours for each 100 shares owned in the Company. Rotation deliveries may <br />extend beyond 12 hours depending on demand from Company shareholders and on water <br />availability in the River. During dry years, the owners share proportionately in any shortage and <br />owners cooperate well to minimize losses and improve efficiencies. <br />Use of Storage Water <br />C:\cdss\MANDitch.doc Manassa Land and Irrigation Company Interview June 21, 1999 -Page 5 of 7 <br />
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