Powder/Tongue River Basin Water Plan
Technical Memoranda

SUBJECT:	Appendix J Storage Operation and Description DULL KNIFE
PREPARED BY:	HKM Engineering Inc.
DATE:	March 2002

KEY STORAGE FACILITIES

Reservoir:	DULL KNIFE (or ENL OF 6800R)
Date:	28 Feb. 2001
Location:	SWSE 22,T47N,R85W
Owner:	NORTH FORK POWDER RIVER WATER USERS ASSN
Year of Construction:	1966
Enlargement History:	1967
Total Storage:	5003 acre-feet
Active Storage:	4345 acre-feet
Dead Storage:	3.055 acre-feet
Area/Capacity Data:	(Source: Undated table on file with State Engineer's Office, Water Div. II)
	Contour Area (acres) Average Area (acres) Capacity (af) Cum. Vol. (af) 8075 0.00 0.99 5.0 5.0 8080 1.98 4.09 20.5 25.4 8085 6.20 9.54 47.7 73.1 8090 12.87 18.38 90.9 164.0 8095 23.89 31.14 155.7 319.7 8100 38.39 44.11 220.6 540.2 8105 49.83 56.01 277.6 817.8 8110 62.19 67.72 338.6 1156.4 8115 73.24 79.13 395.7 1552.0 8120 85.02 89.56 447.8 1999.8 8125 94.10 98.03 490.2 2490.0 8130 101.96 106.40 532.0 3022.0 8135 110.84 115.25 576.3 3598.2 8140 119.66 123.65 618.3 4216.5 8145 127.64 128.07 128.5 4345.0 8146 128.50
Dam Construction Type:	Compacted earth fill
End-of-Month Storage Records:	No
Water Rights:	(Source: Tabulation of Adjudicated Surface Water Rights of the State of Wyoming, Water Division Number Two, Oct. 1999.)
	Reservoir Permit Number Permitted Use Priority Date Volume (af) Headgate Location (S-T-R) Dull Knife Res. 6800R I 08-27-1959 4216.71 22-47-085 Enl. Dull Knife Res 6915R I 06-19-1967 128.51 22-47-085
Designated Use:	Irrigation
Recreational Use:	Fishing
Associated Irrigation Diversions:	(Source: Carmine LoGuidice, Div. II water commissioner/hydrographer)
	Diversion Tributary Webb Perkins N. Fork Powder Canon N. Fork Powder Morgareidge & Francis N. Fork Powder Jones N. Fork Powder Capitola N. Fork Powder Strickler & Rinke N. Fork Powder Dry Bob N. Fork Powder Blaine N. Fork Powder Ritter N. Fork Powder Affalter N. Fork Powder Jarrard N. Fork Powder Buck 1 & 2 N. Fork Powder Burris N. Fork Powder Jarrard 2 N. Fork Powder Miles N. Fork Powder Sahara N. Fork Powder
Associated Industrial Diversions:	None
References:	Carmine Loguidice, water commissioner, State Engineer's Office Div. 2, 20 Feb. 2001.
	Active Dams, State Engineer's Office Safety of Dams Engineering Div. Database, transmitted by Larry Stockdale, Safety of Dams engineering consultant, 16 Feb. 2001.
	Tabulation of Adjudicated Surface Water Rights of the State of Wyoming, Water Division Number Two, Oct. 1999, database transmitted by Rebecca Mathisen, SEO Technical Services Division administrator, 8 Sept. 2000.

Net Evaporative Losses from Dull Knife Reservoir:

Lewis Annual Evaporation (in.)	45
Total Storage (acre-feet)	5,003

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Average percent of total storage	56.72	57.55	57.87	60.80	71.16	72.71	68.17	64.03	57.62	57.03	58.79	60.84
Generated storage (acre-feet)	2838	2879	2895	3042	3560	3638	3411	3203	2883	2853	2941	3044
Corresponding area (acres)	98.03	98.03	98.03	106.4	106.4	115.25	106.4	106.4	98.03	98.03	98.03	106.4
Calculations:
Monthly Lewis Evap. (inches)	1.215	1.125	1.755	3.6	5.175	5.895	7.695	7.02	5.175	3.42	1.755	1.17
Monthly Precipitation (inches)	1.25	1.25	2.25	2.75	3.25	2.75	1.25	1.25	1.75	1.75	1.75	1.25
Net Evaporation (inches)	0	0	0	0.85	1.925	3.145	6.445	5.77	3.425	1.67	0.005	0	TOTAL
Total Net Evaporation (acre-feet)	0	0	0	8	17	30	57	51	28	14	0	0	205