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- Question : 1Q - What is the stream flow in MGD (MLD) for a catchment area of 80 mile2 (207.2 km2) where rainfall rate is 45 in./year (114.3 cm/year) and evaporation rate is 20 in./year (50.8 cm/year)?
- Question : 2Q - A city is served by a raw water reservoir that has a water surface of 5.8 mile2 (15.02 km2) and an average effective depth of 18 ft (5.49 m). Determine the water storage volume.
- Question : 3Q - The population of a city is 400,000, and the average daily per capita water demand is 150 gpcd (567.75 Lpcd). Determine the city
- Question : 4Q - How many days of draft can a raw water reservoir support for a city of 400,000 people? The reservoir has a water surface of 5.8 mile2 15.02 km2 and an average effective depth of 18 ft 5.49 m.
- Question : 5Q - What percentage of mean annual runoff is to be consumed by a city of 400,000 people in an area with (a) rainfall rate 45 in./ year 114.3 cm/year; (b) evaporation rate 20 in./year 50.8 cm/year; and (c) watershed catchment or drainage area 80 mile2 207.2 km2?
- Question : 6Q - Determine the net yield and water storage volume of a rainwater system assuming that (a) the net yield of a rain collection facility approximates two-thirds of its gross yield; (b) the mean annual rainfall 25 in./year 63.5 cm/year; (c) the mean annual evaporation rate is 8 in./year 20.32 cm/year; (d) the rain collection roof area equals 3,200 ft2 297.28 m2; and (e) water storage volume equals 50% of annual net yield.
- Question : 7Q - Determine the storage volume of a new raw water reservoir in accordance with the following given technical information: (a) city population 400,000; (b) water consumption 150 gpcd 568 Lpcd; (c) watershed or catchment area 80 mile2 207.2 km2; (d) rainfall rate 45 in./year 114.3 cm/year; (e) evaporation rate 20 in./year 50.8 cm/year; (f) minimum reservoir volume 50% annual net yield, or half of a year
- Question : 8Q - Determine the number of people who can be sustainably supported by a watershed under the following conditions: (a) watershed area 80 mile2 207.2 km2; (b) annual rainfall rate 45 in./year 114.3 cm/year; (c) annual evaporation rate 20 in./year 50.8 cm/year; (d) water resource development 75%; (e) raw water reservoir volume to store 50% net annual yield or provide half of a year
- Question : 9Q - Determine the number of people who can be adequately supported by a watershed under the following conditions: (a) watershed area 80 mile2 207.2 km2; (b) water supply system with no reservoir for water storage; (c) low-water flow 0.1 ft3/s 64,600 gpd per mile2 2.83 L/s 0.00283 m3/s; and (d) water consumption rate 150 gpcd 568 Lpcd.
- Question : 10Q - Make a rough estimate of the groundwater movement velocity (ft/day or m/day) if (a) all of the groundwater laterally within 400 ft (122 m) of the well comes fully within its influence; and (b) the yield of the aquifer is 258 gpm (gallon per minute) 976.53 L/min 16.28 L/s; and the aquifer through which the groundwater moves is 25 ft (7.62 m) deep.
- Question : 11Q - Estimate the surface area (ft2, or m2) of a slow sand filter that is to deliver water to a village of 1,000 people assuming that (a) the average daily water demand 100 gpcd 378.5 Lpcd; (b) the slow sand filter
- Question : 12Q - Estimate roughly the size of a water supply pipe leading to a water distributing reservoir serving a small village of 2,000 people assuming that (a) the water consumption rate is 100 gpcd 378.5 Lpcd, and (b) water velocity in the pipe 3 ft/s 0.91 m/s.
- Question : 13Q - Determine the diameter of a water main to serve a residential area, assuming (a) an average water demand of 150 gpcd 568 Lpcd; (b) population 30,000; (c) fire flow requirement 500 gpm 2,082 L/min 32 L/s; and (d) recommended water velocity 3.5 ft/s 1.07 m/s.
- Question : 14Q - Roughly, what is the replacement cost of the waterworks of a city of 10,000 people?

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