a. Estimate the ultimate saturation population, L. b. Estimate the community pop

Question

a. Estimate the ultimate saturation population, L.     

b. Estimate the community population in the year 2020, employing the logistic method.    

c. How well do the population data fit the logistic model?    

d. Estimate community water supply requirements in the year 2020.     

e. Estimate community wastewater production in the year 2020.

A historical summary of population, water supply, and wastewater production for a given community is presented below: Year Average Water Supply (mgd) No data No data No data No data 23.8 26.8 25.3 28.0 Population 1900 1910 1920 1930 1940 1950 1960 1970 60,000 95,000 125,000 150,000 170,000 185,000 195,000 200,000 Average Wastewater Supply (mgd) No data No data No data No data 15.3 17.6 16.6 18.0 The community planning department has provided the following on projected land-use and estimated saturation population densities. Estimated Saturation Projected (acres) 800 800 1100 5000 Land-Use Population Density acre Commercial Industrial Residential-Apartments Residential-Single 15 10 100 20

Explanation / Answer

Answer: Year Population Average water average waste water 1900 60000 1910 95000 1920 125000 1930 150000 1940 170000 23.8 15.3 1950 185000 26.8 17.6 1960 195000 25.3 16.6 1970 200000 28 18 Population at saturation = [2P0P1P2..Pn - P1^2(P0+P2)]/(P0P2-P1^2) = 160410 Average population = 147500 Forecasted population in 2020 = 937500

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