Where does Los Angeles get its water from
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- The precipitation in October is 2.5 inches in a 1400 mi² watershed. The ET rate is 0.8 inch/mo. A river flows out of the watershed at 1000 cfs. What is the groundwater recharge rate for the month of October (ft3/mo)? Assume no groundwater exfiltration or other surface flows. What are some assumptions you should make for this problem? What is precipitation in units of ft³/mo? What is ET in ft3/mo? What is the river flow in ft³/mo? What is the groundwater recharge rate in October in ft3/mo?Question 03 In a given year, a catchment with an area of 9536 km? received 1.3 m of precipitation. The average rate of flow measured in a river draining the catchment was 30 m³s1. a. How much total river runoff occurred in the year (in m³)? b. What is the runoff coefficient? c. How much water is lost due to the combined effects of evaporation, transpiration, and infiltration. (Express in m).Question 2 5 points The following is relevant water demand information for the town of Goodborough for the design year of 2050: Design Population = 10000 Annual average per capita water demand = 250 L/d Assume a water supply system of Type C is considered for the town, as shown below: Elevated Storage WTP HLP LP Smce Community camouners) Assuming that BOTH equalization storage AND fire storage provided are sufficient, determine the following to meet the water needs of the community in the design year, as per Ontario guidelines A) Design capacity of the WTP (in ML/d; ignore losses) B) Design capacity of Conduit III (in ML/d)
- Example-1 A 4-hour storm occurs over an 80 km² watershed. The details of the catchment are as follows. Sub Area (km²) 15 25 35 5 Index (mm/hour) 10 15 21 16 1st hour 16 16 12 15 Hourly Rain (mm) 2nd hour 48 42 40 42 3rd hour 22 20 18 18 4th hour 10 Calculate the runoff from the catchment and the hourly distribution of the effective rainfall for the whole catchment.TRUE OR FALSE 1. Baguio water district is covered by DOH Administrative Order 2017-0010.2. The acceptable maximum allowable level of total coliform in drinking water is<500 colony-forming units per mL.3. Community water systems serving 4-6 households within 25 meters of distancemust be tested with all the mandatory parameters of drinking water quality.The data in Table 1 and Table 2 show the monthly precipitation (P) and evapotranspiration (E) for two cities – Munoz City and San Jose City. Compute for the total accumulated water budget for each cities. The first two months have been filled in for you. Table 1. Precipitation and Evapotranspiration of Munoz City Month Precipitation (P) Evapotranspiration (E) | Water budget (mm) |FM|A M J_ JA soN D J 47 42 43 58 80 86 80 65 69 61 40 37 0 0 24 93 | 120 100 | 57 47 105 Table 2. Precipitation and Evapotranspiration of San Jose City JFM Month A MJ J A S N D Precipitation (P) Evapotranspiration (E) Water budget (mm) 17 20 42 62 81 32 42 37 39 34 26 18 65 127 207 103 | 37 33 32 13
- 1. The New York City water supply system is one of the most extensive municipal water systems in the world. This complex system relies on a combination of tunnels, aqueducts and reservoirs to meet the daily needs of millions of residents of the city. The watersheds that feed into NYC reservoirs have a total surface area of 1,969 mi?, and receive an average annual rainfall of 47 inches per year. a. If all of the rain falling on the watersheds is collected in reservoirs, how much water will be collected in the reservoirs? billion gallons per day Check b. Would you expect all of the rain falling on the watersheds to reach the reservoirs? Briefly explain. c. If 35% of the rain falling on the watersheds is collected in reservoirs (i.e., the surface runoff coefficient = 0.35), how much water will be collected in the reservoirs? billion gallons per day d. If we experienced a prolonged period of drought with an annual rainfall of 22 inches per year, (For this part, again consider that 35% of…What is the long-term runoff from a watershed of 225 km2 where Precipitation = 2100 mm/y, Groundwater inputs = 110 mm/yr, Groundwater outputs = 110 mm/y, Evapotranspiration = 1650 mm/yr? 3.211 3.21 3.2 3. None of the answers offeredQuestion 1: You have been assigned to design primary clarifiers for a wastewater treatment plant. The average flow rate of the wastewater is 256000 m3/day with a BOD5 of 120 mg/L and suspended solids concentration of 300 mg/L. The goal is to remove 35% BOD5 and 60% suspended solids in primary treatment. Determine the following: 1) The diameter of the primary clarifier for a surface overflow rate of 50 m3/m2-day.2) The detention time in the primary clarifier and the mass of solids removed in kg/day.Assume a depth of 4m.
- #2 An estimated 60 percent of the annual precipitation in a watershed (drainage area = 20,000 acres) is evaporated. If the average annual river flow at the outlet of the basin has been observed to be 2.5 cfs, determine the annual precipitation (inches) in the basin.A Palm Spring golf course has requested a permit to install a 40000 ft2 pond to enhance the beauty of its facilities. Since the evaporation rates are very high in Palm Springs, it is likely they will need to pump a lot of groundwater to keep the pond full. The city has hired you (a water resources engineer) to determine how much water needs to be pumped per year in order to keep the pond filled. There is a small creek that discharges an average of 0.25 m3/s into the pond. The outlet valve from the pond releases an average rate of 0.30 m3/s (to keep the pond from getting stagnant). Precipitation on the pond is 260 mm/year, and the annual evaporation is estimated to be 105 inches/year. The pond will be lined with concrete to prevent any drainage or seepage from the bottom. Using a water balance, what volume (on average) of groundwater (in cubic meters) must be added to the lake each year to keep the pond at a constant level? Draw a schematic of the problem to identify the control volume…Q2: A municipal wastewater treatment plant discharges secondary effluent to a river. The worst condition occurs in the summer when the treated wastewater in summer is found to have a maximum flow rate of 10000 m³/day, a BODs of 30 mg/L, dissolved oxygen concentration of 1.5 mg/L and temperature of 25°C. At upstream of the disposal point the minimum flow in the stream is 0.65 m³/sec with BODs of 3.0 mg/L, dissolved oxygen concentration of 7.0 mg/L and temperature of 22°C. The mixing of wastewater and stream is almost instantaneous at the point of disposal and velocity of the mixture is 0.2 m/sec. The reaeration constant is estimated to be 0.4 per day at 20°C the dissolved oxygen sag curve a (100-km) (D20,40,50,75,100) temperature. Determine and sketch reach of the stream below the discharge?. Do