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Inlet/Outlet Ditch Capacity: Conveyance capacities of the various locations into and out of <br />Boyd Lake are as follows: <br />• Boyd Lake can be filled completely by gravity from Horseshoe Lake and Heinricy <br />Lake, and from the Loveland Greeley Canal when storage is less than 41,328 ac-ft. <br />• The Horseshoe Lake pass-through to Boyd Lake is an underground pipe limited to <br />300 cfs capacity. <br />• The concrete chute with board slots between Heinricy Lake (Lake No. 4) and Boyd <br />Lake can convey 100 cfs through the box chute. <br />• Releases up to 300 cfs can be made by gravity from Boyd Lake when storage is above <br />41,328 ac-ft (gauge height 52.5 feet). <br />• Boyd Lake releases to the Loveland Greeley Canal when storage is below 41,328 ac- <br />ft historically occurred via two pumps located on the southeast side of Boyd Lake at <br />gauge height 5 feet (567 ac-ft storage capacity). These releases were limited by a 150 <br />cfs pumping capacity until 2003 when a third pump was brought online, increasing <br />the pumping capacity to 225 cfs. <br />• Storage releases from Boyd Lake to the Big Thompson River are made through a <br />headgate and outlet ditch, limited to a capacity of 35 cfs down to a storage capacity of <br />22,486 ac-ft (gauge height 28.0 feet). <br />Elevation Capacity Data: An elevation-capacity curve for the reservoir was provided by the <br />GLIC. A subset of points from the curve is provided in Table 3. <br />Table 3 <br />Boyd Lake <br />Stage -Area -Capacity Curve <br />Elev. Area Capacity <br />(ft) (Acres) (Ac-Ft) <br />0 NA 0 <br />3 NA 202 <br />6 NA 838 <br />9 NA 1914 <br />12 NA 3277 <br />15 NA 4870 <br />18 NA 6651 <br />21 NA 8588 <br />24 NA 10683 <br />27 NA 12926 <br />Elev. Area Capacity <br />(ft) (Acres) (Ac-Ft) <br />30 NA 15311 <br />33 NA 17832 <br />36 NA 20542 <br />39 NA 23502 <br />42 NA 26803 <br />45 NA 30530 <br />48 NA 34618 <br />51 NA 39043 <br />54 NA 43794 <br />57.1 1680 49048 <br />Source: GLIC. Survey September 9, 1955. <br />Notes: Dead storage of 567 ac-ft. (elevation 5 feet). <br />NA -not available. <br />Enlargement History: Boyd Lake has not been enlarged. <br />Greeley Loveland Irrigation Company Operating Memorandum.doc 11 of 18 January 5, 2005 <br />