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MUNICIPAL RESIDENTIAL WATER CONSUMPTION All of the following communities get their water from one source, For many reasons, however, the homes in each community use different amounts of water, The data below shows these differences, MUNICIPAL RESIDENTIAL WATER CONSUMPTION DATA July, 1966 - June, 1973 CITY MEAN GALLONS I RESIDENTIAL ACCOUNT I DAY 68-69 69-70 70-71 71-72 72-73 July, 1968-June, 1973 Alameda 366 405 398 422 412 401 Albany 233 262 247 255 242 248 Berkeley 326 354 345 355 333 343 EI Cerrito 307 330 317 330 305 318 Emeryville 256 270 273 293 346 288 Oakland 306 334 325 336 330 326 Piedmont 438 512 476 502 453 476 Pinole-Hercules 354 449 408 425 401 407 Richmond 291 316 307 318 311 309 San Leandro 359 399 373 391 377 380 San Pablo 321 346 337 345 351 340 Walnut Creek 738 873 815 869 865 832 TOTAL MEAN 358 404 385 403 394 458 TOTAL MEDIAN 486 568 531 562 554 540 TOTAL RANGE 505 611 568 614 623 584 Plot the residential water consumption for .Oakland and Walnut Creek on the graph below, 900 Why do you think there is such a difference .... / between the two? (Note: can the data on 800 p. 8 help you?) /' 1) Walnur Creek has larger lots, 50% of residential water goes on the garden. 700 Walnut Creek, with its warmer weather, uses very large amounts of water in the summer months. 2) Excessive planting of non. 600 Mediterranean zone vegetation which reo quires more water. 3) Newer houses with more water consumptive devices. 4) Oif- 500 (erent lifestyles which encourage greater water consumption. Now plot out the data for another community, 400 Do the results look more like that of Oakland or Walnut Creek? Why do you think this is so? 300 Oakland, With the exception of Walnut Creek, al/ of the rest of the communities cited are west of the Oakland-Berkeley hills and share 200 the water-saving climatic benefits. 1969 1970 1971 1972 1973 YEAR ENDING JUNE 30 -22-