Gatew-1.1/PP-CS 900308 (3) GATEWAY BUSINESS PARK
WATER AND WASTEWATER DEMAND ANALYSIS
I. POPULATION FORECAST FOR LIGHT ENDUSTRIAL LAND USE
A. Assumptions
1. 85% of gross land area is developab!e land.
2. 50% of developable land is gross floor space.
3. 50% of gross floor space is office area.
4. One person per 150 square feet of office area.
B. Calculations
1. For one acre of land zoned light industrial:
43,560 S.F. (0.85) (0.50) (0.50) 1/150 = 61.71 people / AC
~ 62 P/AC.
2. Tributary area population:
103 Ac Onsite
30 Ac Offsite
133 Ac Total (62 P/AC) = 8246 People
H. WASTENVATER DF~MAND FORECAST
A. Assumptions (Source: Texas Department of Health and Texas Departa~ent
of Water Resources)
1. Daily Demand = 20 Gallons per day per persov
2. Peaking Factor = 4
3. Infiltration = 150 Gallons per day per acre
B. Calculation of peak flow plus infiltration
Qr = 8246 P (20 gpd/c) (4) + 133 AC (150)
= 659,680 + 19,950
= 679,630 gpd
= 0.68 MGD
HI. WATER DEMAND FORECAST - (Onsite area only)
A. Assumptions
1. Daily Demand = 24 Gallons per day per person (Source: Texas
Department of Health).
2. Peaking factor for conversion of average day to maximum day = 2.
3, Peaking factor for conversion of maximum day to maximum hour =
2.
B. Calculation of maximum hour demand:
O,~n = 103 AC (62 P/AC) 24 gpd/c) (2) (2)
= 613,056 gpd
= 0.61 MGD