The sketch depicts water flows to satisfy the demand in the City of Los Angeles. The relative size of the arrows is representative of the City's situation in the 1980s, the decade when the City's rights to diversions from the Mono Basin were challenged. Total water demand in an average year was around 620,000 acre-feet per year, or 620 KAF/yr.

The majority of this need was served by the Los Angeles Aqueduct. The aqueduct collects diversions from the Owens Valley and the Mono Basin and brings the water south to Los Angeles. In an average year, Owens Valley Diversions were around 370 KAF/yr. Mono Basin diversions added another 100 KAF/yr. The combined flow of 470 KAF/yr provided Los Angeles with around 75% of its demand.

Local wells are depicted at the bottom of the drawing. Ground water pumping would deliver just over 100 KAF/yr in an average year. The combination of supplies from local wells and from the Los Angeles Aqueduct would deliver over 90% of the City's demand.

The long, thin arrow depicts the remaining 10%, around 60 KAF/yr. This is the marginal supply of water to the City. This is purchased from the MET, the Metropolitan Water District. The MET's supply was small in the 1980s, but it grow to be quite significant in the future.

A link to water reclamation information also applears at the bottom of the drawing. Reclamation of used water has been quite limited due to capital requirements and concerns over the health effects.

The final link connects to a page of information on the potential for improvements in the efficiency of water use. Improved efficiency has the poential to lower the City's demand in a cost-effective manner. Reduced demand, in turn, may reduce the need for Mono Basin diversions and for larger purchases from the MET.