Referencing Styles : Harvard Determine the gross water supply reservoir volume for the following information: City population: 200,000 Water consumption rate: 568 Lpcd Catchment area: 103 Km2 Rainfall rate: 110cm/yr Average Class A pan evaporation: 7.5 mm/day Free surface evaporation coefficient: 0.7 Soil surface evaporation coefficient: 0.5 Minimum net reservoir volume: 50% of annual yield or half of a year water supply whichever is greater. If during the droughts 25% of water required is supplied from a deep well field, how many deep wells with 30 liter/second discharge are required if each well supplies water for 12 hours per day. (3 Marks) 2. How much energy in KJ is liberated when 1 mm of evaporated wastewater is condensed on the half empty space of a main concrete pipe with 900 mm diameter? The wastewater temperature is assumed as 30 degree of Celsius. a. What is the implication of condensation in the above sewer system? b. How the impacts can be alleviated? (2 Marks) 3. Estimate the capacity of the following water supply scheme if the future population estimated as 30,000 persons with 568 Lpcd and fire fighting capacity of 3875 L/min for 2 hours. If 30% of supplied water is retained within the consumption areas ( as garden water,…) determine daily average, daily maximum and daily minimum of wastewater using both tabulated coefficients and Peaking Factors using Gifft’s formula. (4 Marks) 4. Draw a street cross section with 12 m width and 3m sidewalk on each side. Triangular gutters on both sides have 25 cm depth. The street Center Line and sidewalks are at the same elevation. For the following utilities show the minimum depths of placement, order of placement and standard distance from each other. Use the following CAPITAL LETTERS inside small circles to show the utility. Assume deep ground water table. ( Map Scale 1:100) (2 Marks) E: Electricity WS: Water Supply SE: Sanitary Sewer S: Storm Sewer NG: Natural Gas T: Telephone 5. A main sewer pipe with n = 0.014 is laid on a slope of 0.0002 and is to carry 0.35 m3/s of wastewater when the pipe flows 0.4 full. a. Determine full flow discharge b. Determine the diameter of the sewer and full flow velocity c. Determine self cleansing discharge, slope and velocity when c-1: N/n is equal one c-2: N/n is variable d. Briefly discuss d-1: which case, c-1 or c-2, occurs in reality? d-2: what possible problem this sewer will face in future? d-3: what are the solutions to the problem considering the slope being inflexible? (3 Marks) 6. The plan of a part of sewer trunk line between manholes of MH102 to MH104 is presented below in the figure. Three main sewers of 400,500 and 300 mm diameter are connected to the trunk line at manholes 102,103 and 104 respectively. Assuming the following design criteria and data as Minimum allowed velocity in sewers 0.8 m/s Maximum allowed velocity 3.0 m/s Minimum soil cover 1.5 m Manning roughness coefficient 0.013 Ground elevations MH 102 649.50 m MH 103 649.30 m MH 104 649.00 m Invert elevations 800 mm trunk line MH 102 647.20 m 400 mm sewer at MH 102 646.00 m 500 mm sewer at MH 103 647.30 m 300 mm sewer at MH 104 645.83 m a. Design the trunk line between MH 102 and MH 104. b. Present Plan, profile and constructional details of the trunk line ( a typical manhole and main to trunk connection details to be presented as well) (6 Marks)