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Guanxian
Guanxian
Traditional Chinese	灌縣
Simplified Chinese	灌县
Postal	Kwanhsien
Hanyu Pinyin
Transcriptions
Standard Mandarin
Hanyu Pinyin	Guànxiàn
Wade–Giles	Kuan4-hsien4

Dujiangyan
Dujiangyan
Chinese	都江堰
Postal	Tukiangyen; Kwanhsien (until 1988)
Hanyu Pinyin
Transcriptions
Standard Mandarin
Hanyu Pinyin	Dūjiāngyàn
Wade–Giles	Tu1-chiang1-yan4

Dujiangyan

都江堰市
Dujiangyan 都江堰市
County-level city
	Dujiangyan skyline
	Etymology: Dujiangyan
	Location of Dujiangyan in Sichuan
	Dujiangyan Location in Sichuan Province
	Coordinates (Dujiangyan Government): 30°59′17″N 103°38′49″E / 30.988°N 103.647°E
Country	China
Province	Sichuan
Sub-provincial city	Chengdu
Municipal seat	Guankou Subdistrict
Area
• Total	1,208 km2 (466 sq mi)
Population (2020)
• Total	710,056
• Density	545/km2 (1,410/sq mi)
Time zone	UTC+8 (China Standard)
Postal code	6118XX
Chengdu district map
Subdivisions of Chengdu, Sichuan
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
	Core districts
1	Jinjiang
2	Qingyang
3	Jinniu
4	Wuhou
5	Chenghua
	Suburbs
6	Longquanyi
7	Qingbaijiang
8	Xindu
9	Wenjiang
11	Shuangliu
12	Pidu
15	Xinjin
	Satellite cities
16	Dujiangyan
17	Pengzhou
18	Qionglai
19	Chongzhou
20	Jianyang
	Rural
10	Jintang Co.
13	Dayi Co.
14	Pujiang Co.
Website	www.djy.gov.cn

Dujiangyan (Chinese: 都江堰; pinyin: Dūjiāngyàn) is a county-level city of Sichuan Province, Southwest China, it is under the administration of the prefecture-level city of Chengdu. Its north-west region forms a border with southern Ngawa Tibetan and Qiang Autonomous Prefecture. It has an area of 1,208 km² (466 sq mi) and had a population of 710,056 in 2020.^[1]

Dujiangyan was formerly a county named Guanxian or Guan County (灌县; 'irrigation" county'). The county became a county-level city in 1988 and was renamed after the Dujiangyan Irrigation System, in the city's northwest, famous for providing Chengdu with water for over two millennia, since around 250 BC.

History

Around 250 BC during the Warring States period, Li Bing, a governor of Shu (present Sichuan Province) in the Qin state with his son directed the construction of Dujiangyan. Li Bing gave up the old ways of dam building, which were simply directed at flood control, employing a new method of channeling and dividing the water of the Min River. He accomplished this by separating the project into two main parts: the headwork and the irrigation system. The whole system has functioned for 2,000 years, preventing floods and providing substantial irrigation and facilitating shipping and wood drifting. It has contributed greatly to the richness of Chengdu Plain with its reputation as "The Land of Abundance".^{[citation needed]}

On 12 May 2008, the city was the closest to the epicenter of the 2008 Sichuan earthquake and the city suffered severe damage. Xinjian Primary School, Juyuan Middle School, and Xiang'e Middle School collapsed in the earthquake.^[2]^[3]^[4]

Climate

Dujiangyan has a monsoon-influenced humid subtropical climate (Köppen Cwa) with cool, dry winters and hot, very wet summers.

Climate data for Dujiangyan, elevation 689 m (2,260 ft), (1991–2020 normals, extremes 1971–present)
Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Record high °C (°F)	17.9 (64.2)	21.0 (69.8)	29.7 (85.5)	31.3 (88.3)	33.4 (92.1)	34.7 (94.5)	35.5 (95.9)	37.9 (100.2)	34.2 (93.6)	28.2 (82.8)	24.8 (76.6)	17.7 (63.9)	37.9 (100.2)
Mean daily maximum °C (°F)	8.5 (47.3)	11.1 (52.0)	15.7 (60.3)	21.3 (70.3)	25.1 (77.2)	27.4 (81.3)	29.4 (84.9)	29.1 (84.4)	24.7 (76.5)	19.7 (67.5)	15.2 (59.4)	10.0 (50.0)	19.8 (67.6)
Daily mean °C (°F)	5.2 (41.4)	7.5 (45.5)	11.6 (52.9)	16.7 (62.1)	20.6 (69.1)	23.3 (73.9)	25.2 (77.4)	24.8 (76.6)	21.0 (69.8)	16.4 (61.5)	11.8 (53.2)	6.6 (43.9)	15.9 (60.6)
Mean daily minimum °C (°F)	2.7 (36.9)	4.9 (40.8)	8.4 (47.1)	13.1 (55.6)	17.0 (62.6)	20.0 (68.0)	21.9 (71.4)	21.6 (70.9)	18.5 (65.3)	14.2 (57.6)	9.5 (49.1)	4.2 (39.6)	13.0 (55.4)
Record low °C (°F)	−5.0 (23.0)	−3.6 (25.5)	−2.9 (26.8)	0.4 (32.7)	6.4 (43.5)	13.1 (55.6)	15.6 (60.1)	15.0 (59.0)	11.9 (53.4)	2.9 (37.2)	−0.2 (31.6)	−7.1 (19.2)	−7.1 (19.2)
Average precipitation mm (inches)	15.3 (0.60)	20.2 (0.80)	41.9 (1.65)	65.7 (2.59)	91.3 (3.59)	115.8 (4.56)	266.5 (10.49)	273.4 (10.76)	161.2 (6.35)	71.3 (2.81)	30.9 (1.22)	13.0 (0.51)	1,166.5 (45.93)
Average precipitation days (≥ 0.1 mm)	11.0	12.0	14.2	15.2	16.2	16.7	18.0	17.2	19.3	19.5	11.5	9.1	179.9
Average snowy days	3.2	1.3	0.1	0	0	0	0	0	0	0	0.1	0.7	5.4
Average relative humidity (%)	80	79	76	74	71	75	78	79	83	84	82	81	79
Mean monthly sunshine hours	46.2	45.8	67.2	93.9	96.9	86.6	108.4	106.6	46.8	39.0	47.7	49.7	834.8
Percent possible sunshine	14	15	18	24	23	21	25	26	13	11	15	16	18
Source 1: China Meteorological Administration^[5]^[6]all-time extreme temperature^[7]
Source 2: Weather China^[8]