2. Outline of the Tokyo Waterworks 第2 東京都水道局の概要 1 Service Area 1 給水区域等
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2. Outline of the Tokyo Waterworks 第2 東京都水道局の概要 1 Service Area 1 給水区域等 The Bureau of Waterworks supplies water to the 23 wards 水道局は、23 区と多摩地区の 25 市町に給水して and 25 cities and towns in the Tama area. In addition, the いるほか、給水区域に含まれていない未統合3市に対 bureau diverts water to three unincorporated cities in the して分水を行っている。 Tama area that are not included in the service area. このうち多摩地区の5市については、それぞれの地 For the five cities in the Tama area, we commission the 域のお客さまと密接にかかわる水道料金徴収等の業務 affairs related to customer service, such as the collection を、各市に委託している。これについては、今後、順 of water bills, to the cities. We will dissolve these 次解消していく予定である。 commissions sequentially in the future. Table : Basic Data on Water Supply (As of March 2009 (Heisei 21)) 表 給水区域面積等（平成21年3月現在） Service area 2 給水区域面積 1222.78km Population served 給水人口 12,554,106人（people） Pervasion 普及率 100％ Number of service connections 給水件数 6,831,308件（cases） Total length of distribution pipes 配水管延長 25,823km Total capacity of facilities 3 3 施設能力 6,859,500m /日（m /day） Total distribution amount per year 3 3 年間総配水量 1,581,925×10 m Maximum distribution amount per day 3 3 一日最大配水量 4,824,000m /日（m /day） Ave. distribution amount per day 3 3 一日平均配水量 4,334,000m /日（m /day） （note）Service area, population served, pervasion and number of service connections are numbers as of October 1st, 2008（Heisei 20）. (注)給水区域面積、給水人口、普及率及び給水件数については、平成20年10月１日を基準日とした。 7 Figure : Outline of Water Resources and Service Areas by River Systems 図 水道水源と水系別給水区域概要図 Yagisawa Dam Crest height 131 m Naramata Dam Effective storage capacity 175.8 million m3 Water utilization capacity 115.5 million m3 Crest height 158 m Effective storage capacity 85.00 million m3 Water utilization capacity 85.00 million m3 Fujiwara Dam Crest height 95 m Aimata Dam Effective storage capacity 35.89 million m3 Water utilization capacity 31.01 million m3 Kusaki Dam Crest height 67 m Effective storage capacity 20.0 million m3 Sonohara Dam Naka River Water utilization capacity 20.0 million m3 Akaya River Crest height 140 m Effective storage capacity 50.50 million m3 Kasumigaura Yanba Dam Water utilization capacity 50.50 million m3 Crest height 77 m Water Conveyance Effective storage capacity 14.14 million m3 Katashina River Water utilization capacity 13.22 million m3 Agatsuma River Effective storage capacity 90.0 million m3 Construction period From 1976 to 2015 Water utilization capacity 90.0 million m3 Construction period From 1967 to 2015 Watarase River S51～H27 Tone Weir Kasumigaura kaihatsu Lake Kasumigaura Shimokubo Dam Effective storage capacity 617.0 million m3 Crest height 129 m Tone River Water utilization capacity 278.0 million m3 Effective storage capacity 120.0 million m3 Watarase Reservoir Water utilization capacity 120.0 million m3 Kanna River Sekiyado Lock Gate Takizawa Dam Musashi Channel Effective storage capacity 26.4 million m3 Nakatsu River Water utilization capacity 26.4 million m3 Hitachigawa Floodgate Effective storage capacity 58.0 million m3 Water utilization capacity 58.0 million m3 Urayama Dam Construction period From 1969 to 2010 Ara River Edo River Crest height 156 m Saitama Goguchi Stage Ⅱ Tone River Estuary Weir S44～H22 Effective storage capacity 56.0 million m3 Water utilization capacity 56.0 million m3 Akigase Intake Weir Tone Chuo Naka Futase Dam Ogouchi Dam Yamaguchi Reservoir Arakawa Reservoir River Kita-chiba Water Conveyance Channel Asaka Channel Misato Crest height 149 m Okutama town 3 Crest height 95 m Effective storage capacity 185.4 million m3 Effective storage capacity 34.35 million m 3 Effective storage capacity 10.6 million m3 Effective storage capacity 21.8 million m3 3 Water utilization capacity 34.35 million m Water utilization capacity 185.4 million m Water utilization capacity 10.2 million m3 Nakagawa River/Edo River Water utilization capacity 20.0 million m3 Oume city Ozaku Intake Weir Asaka Connection Water Conveyance Channel Murayama Reservoir Misono Adachi ward Tama River Kiyose city Ozaku Kanamachi Water conservation forests Hamura Intake Weir Mizuho town Higashi-murayama Kita ward Higashi- Itabashi ward Katsushika murayama city ward 21,631ha Hamura city Higashi- Nerima ward Musashi- Higashi- Arakawa ward Hinode town kurume city murayama city yamato city Nishi- Toshima ward Fussa city tokyo city Nakano Bunkyo Taito ward Edogawa Kodaira city ward ward Sumida ward ward Akiruno city Musashino Shinjuku ward Gyotoku Movable Weir Hinohara village city Suginami Tachikawa Kokubunji city Koganei Chiyoda Akishima city city city Sakai ward Koto ward Kunitachi Mitaka city Suginami ward Shibuya city Chuo ward ward Fuchu city Minato Chofu city Setagaya ward ward Hino city Hachioji city Kinuta Meguro Edo River Kinutashimo Komae ward Lock Gate Tama city Inagi city city Nagasawa Shinagawa ward Sagami Dam Chofu Intake Weir Tamagawa (halted) Tone River Machida city Ota ward Tama River Tama River Siroyama Dam Mixed river system of the Tone and Tama Rivers Sagami River Intake Weir Sagami River Purification plant Dam (completed) Water conveyance channel (completed) Dam (under construction and planning) Water conveyance channel Agricultural water rationalization program (under construction and planning) 8 Outline of the Tokyo Waterworks/東京都水道局の概要 Yagisawa Dam Crest height 131 m Naramata Dam Effective storage capacity 175.8 million m3 Water utilization capacity 115.5 million m3 Crest height 158 m Effective storage capacity 85.00 million m3 Water utilization capacity 85.00 million m3 Fujiwara Dam Crest height 95 m Aimata Dam Effective storage capacity 35.89 million m3 Water utilization capacity 31.01 million m3 Kusaki Dam Crest height 67 m Effective storage capacity 20.0 million m3 Sonohara Dam Naka River Water utilization capacity 20.0 million m3 Akaya River Crest height 140 m Effective storage capacity 50.50 million m3 Kasumigaura Yanba Dam Water utilization capacity 50.50 million m3 Crest height 77 m Water Conveyance Effective storage capacity 14.14 million m3 Katashina River Water utilization capacity 13.22 million m3 Agatsuma River Effective storage capacity 90.0 million m3 Construction period From 1976 to 2015 Water utilization capacity 90.0 million m3 Construction period From 1967 to 2015 Watarase River S51～H27 Tone Weir Kasumigaura kaihatsu Lake Kasumigaura Shimokubo Dam Effective storage capacity 617.0 million m3 Crest height 129 m Tone River Water utilization capacity 278.0 million m3 Effective storage capacity 120.0 million m3 Watarase Reservoir Water utilization capacity 120.0 million m3 Kanna River Sekiyado Lock Gate Takizawa Dam Musashi Channel Effective storage capacity 26.4 million m3 Nakatsu River Water utilization capacity 26.4 million m3 Hitachigawa Floodgate Effective storage capacity 58.0 million m3 Water utilization capacity 58.0 million m3 Urayama Dam Construction period From 1969 to 2010 Ara River Edo River Crest height 156 m Saitama Goguchi Stage Ⅱ Tone River Estuary Weir S44～H22 Effective storage capacity 56.0 million m3 Water utilization capacity 56.0 million m3 Akigase Intake Weir Tone Chuo Naka Futase Dam Ogouchi Dam Yamaguchi Reservoir Arakawa Reservoir River Kita-chiba Water Conveyance Channel Asaka Channel Misato Crest height 149 m Okutama town 3 Crest height 95 m Effective storage capacity 185.4 million m3 Effective storage capacity 34.35 million m 3 Effective storage capacity 10.6 million m3 Effective storage capacity 21.8 million m3 3 Water utilization capacity 34.35 million m Water utilization capacity 185.4 million m Water utilization capacity 10.2 million m3 Nakagawa River/Edo River Water utilization capacity 20.0 million m3 Oume city Ozaku Intake Weir Asaka Connection Water Conveyance Channel Murayama Reservoir Misono Adachi ward Tama River Kiyose city Ozaku Kanamachi Water conservation forests Hamura Intake Weir Mizuho town Higashi-murayama Kita ward Higashi- Itabashi ward Katsushika murayama city ward 21,631ha Hamura city Higashi- Nerima ward Musashi- Higashi- Arakawa ward Hinode town kurume city murayama city yamato city Nishi- Toshima ward Fussa city tokyo city Nakano Bunkyo Taito ward Edogawa Kodaira city ward ward Sumida ward ward Akiruno city Musashino Shinjuku ward Gyotoku Movable Weir Hinohara village city Suginami Tachikawa Kokubunji city Koganei Chiyoda Akishima city city city Sakai ward Koto ward Kunitachi Mitaka city Suginami ward Shibuya city Chuo ward ward Fuchu city Minato Chofu city Setagaya ward ward Hino city Hachioji city Kinuta Meguro Edo River Kinutashimo Komae ward Lock Gate Tama city Inagi city city Nagasawa Shinagawa ward Sagami Dam Chofu Intake Weir Tamagawa (halted) Tone River Machida city Ota ward Tama River Tama River Siroyama Dam Mixed river system of the Tone and Tama Rivers Sagami River Intake Weir Sagami River Purification plant Dam (completed) Water conveyance channel (completed) Dam (under construction and planning) Water conveyance channel Agricultural water rationalization program (under construction and planning) 9 2 Forecasting of the maximum ２ 一日最大配水量の予測 distribution amount per day The water demand in Tokyo has been increasing each 東京の水道需要は、年々増加を続けてきた。特に昭 year. In particular, during the high economic growth 和30年代後半から昭和40年代にかけての経済の高 period from the early 60s（ second half of Showa 30s） 度成長期には、東京を始めとする首都圏に人口や産業 to the first half of the 70s（ Showa 40s）, water demand が集中したため、大幅な増加を記録した。 recorded a substantial increase due to the concentration しかし、昭和 48 年秋のオイルショック以降、経済 of population and industries in the metropolitan areas of の低成長への移行や水道需要抑制策の浸透等により、 Tokyo. 水道需要の増加傾向は急激に緩和された。最近では、 However, after the oil crisis in the fall of 1973（ Showa 48）, the upward trend of water demand slowed sharply 長期にわたる景気の低迷等の影響を受け、一日最大配 due to the shift to a lower economic growth rate and 水量は横ばい、又は減少傾向で推移している。 penetration of a restrictive water demand policy. In recent 今後の水道需要は、平均世帯人員の減少等により一 years, due to the long economic slump, the maximum 人当たりの使用水量の増加が見込まれることなどか distribution amount per day leveled off or has been on a ら、一日平均使用水量は引き続き増加傾向を示すと考 declining trend. えられる。それに伴い、一日最大配水量は平成 25 年 As for the water demand in the future, the average 度には600万m3 程度になるものと予測している。 consumption amount per day is forecasted to increase continuously because water usage per person is expected to increase from the decrease in the average number of persons in the household.