Board Meeting 12/09/1998 - Laserfiche WebLink

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~ Martin-Holn Ditch The Martin-Holn Ditch is decreed for 4 cfs for irrigation purposes. The Martin-Holn's decreed point of diversion is located on Tennessee Creek upstream of the Lucas Ditch. This ditch is junior to the Lucas Ditch and would have been called out by the Lucas Ditch is low flow years. However, sometime in the past the actual point of diversion for this ditch was moved downstream of the Lucas Ditch and within the proposed instream flow reach. No request for change of point of diversion was filed with the water court. This new point of diversion allows the Martin-Holn Ditch to divert more than it would have at its' original point of diversion because it now benefits from inflows from Longs Gulch and any seepage and/or return flows from the Lucas Ditc~.:... Table 4 below shows the average monthly diversion amounts for the Martin-Holn 1:;<:>1. This information was provided to the CWCB by the ESF (see attached Figure 6). Table 4: Shows the average diversions for the Lucas and Martin-Holn Ditches as provided to the CWCB by the PBWW (Figure 3) and ESF (Figure 6). MAY JUN JUL AUG SEP OCT NaY Lucas 1.7 8.2 7,9 6.\ 2,\ Ditch Martin- 1.5 1.8 1.2 0.94 0.72 0.70 0,13 Holn Total 3.2 10 9.\ 7.0 2.8 0.7 0.1 The following Table shows what the estimated median monthly flow is when you account for the average diversions from the Lucas and Martin-Holn Ditches: OCT NaY DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 6.4 3.9 3,\ 2,9 3.\ 3,\ 6.4 50 95 54 14 6,7 The Tennessee Creek instream flow recommendation benefits significantly from these early season irrigation practices by seeing delayed return flows to the segment in the fall and winter seasons when the PBWW stops importing transbasin water. However, it is difficult to tell exactly where these return flows will accrue to the stream. The Martin- Holn ditch is decreed for 4 cfs for irrigation uses and diversion records for the past 20 years indicate it rarely diverts after August. The duty of water identified in the decrees of the Lucas and Martin-Holn ditches indicates that 1 cfs. .is required to irrigate approximately 50 acres. The Aerial photo provided to the Board by the ESF, shows that the area currently irrigated by the Martin-Holn Ditch is only 85 acres. These acres are directly adjacent to Tennessee Creek. So if the Martin-Holn ditch does divert its full decreed amount of 4 cfs or two times the amount required to irrigate the 85 acres identified, return flows to the stream should occur very quickly.' This same photo shows the lands irrigated by the Lucas Ditch. The Lucas Ditch irrigated acres are further away from Tennessee Creek and would not return as quickly.