Adjustments for (DCDQ2) DUNCAN - DUNCAN DAM are calculated from the following:

    Runoff Volume at DUNCAN - DUNCAN DAM
     Plus the Runoff Volume at DUNCAN - DUNCAN DAM
     Plus the Lake Storage Volume at DUNCAN - DUNCAN DAM

(DCDQ2) DUNCAN - DUNCAN DAM 30-Year Averages and Normals     Unit in KAF
Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
1970	-9999	-9999	-9999	-9999	-9999	-9999	-9999	-9999	-9999	85	61	59
1971	47	36	39	87	449	631	569	435	137	93	67	58
1972	67	42	67	83	417	856	684	488	152	98	56	62
1973	66	45	30	80	324	494	485	321	151	97	70	46
1974	51	41	39	112	283	802	682	396	184	67	47	61
1975	54	33	20	53	266	535	609	328	172	119	115	100
1976	62	50	29	92	437	484	806	590	352	135	68	47
1977	35	36	20	114	289	536	365	353	162	75	57	69
1978	38	18	54	123	296	580	619	322	291	149	87	62
1979	40	30	35	64	301	520	464	321	193	88	36	70
1980	33	31	31	179	610	551	442	246	177	110	72	89
1981	82	49	47	94	458	426	711	463	210	95	87	63
1982	68	39	38	59	299	793	613	393	242	113	75	62
1983	63	40	58	109	369	552	634	413	161	74	100	66
1984	60	36	43	100	188	597	582	423	184	87	73	58
1985	35	24	25	107	450	507	482	253	125	92	63	58
1986	50	31	68	118	403	736	490	358	137	88	72	68
1987	61	23	47	127	515	591	439	243	176	58	65	52
1988	40	23	46	189	417	667	501	308	149	129	81	68
1989	59	34	33	109	320	595	486	329	154	80	113	87
1990	70	33	40	163	332	601	663	372	171	101	131	90
1991	68	45	38	113	425	584	753	522	186	88	50	54
1992	54	56	65	144	430	636	362	269	128	119	62	53
1993	31	15	40	95	497	400	320	260	122	81	52	50
1994	66	41	40	189	488	504	519	312	159	85	49	47
1995	28	26	39	88	381	649	484	349	208	144	108	90
1996	67	45	47	125	324	661	806	433	168	114	76	59
1997	54	33	48	85	466	720	733	420	265	215	105	70
1998	69	37	60	130	573	450	481	350	205	105	65	48
1999	46	27	47	121	387	658	619	589	179	102	165	79
2000	72	47	40	134	338	536	664	388	230	-9999	-9999	-9999
Avg	55	35	42	113	391	595	569	375	184	103	78	65

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Standards - Every 30 years the international meteorological community comes together to produce a document that summarizes the normal climate for all of the nations of the world. The effort was originated by the International Meteorological Committee in 1872 as an effort to assure comparability between data collected at various stations. International agreements eventually determined that the appropriate interval for computing a normal would be 30 years. The World Meteorological Organization (WMO), which succeeded the International Meteorological Committee, defines normals as... period averages computed for a uniform and relatively long period comprising at least three consecutive 10-year periods. Normals are computed every decade by individual countries to keep up with any climatic changes that may take place, but a coordinated international effort to compile global standard normals is undertaken only once every 30 years. The National Weather Service updates these normals every 10 years. The latest global standard normals period is 1971-2000.

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US Dept of Commerce National Oceanic and Atmospheric Administration National Weather Service Northwest River Forecast Center (NWRFC) 5241 NE 122nd Avenue Portland, Oregon 97230-1089 Telephone: 503-326-7401 Last Modified: February 12, 2009

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