Urban Water Management and Wastewater Design

Question 1.

For a catchment in the Penrith Council area of size 100 ha, estimate the available amount of stormwater for non-potable uses with in the catchment.

Obtain monthly rainfall data for Penrith Lakes (Station ID 067113) AWS from BoM website. Calculate the average annual rainfall and then use this value to estimate the amount of stormwater available for non-potable uses.

Assume the losses as given below:

St  = 10% of the rainfall

Sm = 12% of the rainfall

Gwr = 8% of the rainfall

Ep = 10% of the rainfall

Et = 5% of the rainfall

Ro = 25% of the rainfall

Question 2. (20%)

A lake receives 150 m³/d of stormwater. Concertation of total phosphorus (TP) in the stormwater that is entering the lake is 3 mg/L. On an average the 40% of the inflow gets evaporated and the rest flows through the lake.

1. Determine the concentration of TP in the stormwater flowing out of the lake.
2. Also, within the lake, if 20% of TP gets consumed by the plants that are present in the lake, determine the concentration of TP in the stormwater effluent from the lake.

Question 3:

It is required to design a wastewater treatment system for a small city. The flow measurements are not available. However, the following data are available:

• Houses = 1,200 (25% residing in highrise, 25% in low rise; 25% in typical home; 15% in better home; and 10% in luxury home). No. of people in each house can be taken as 3.5.
• Hotels = 2 (total 500 guests and 100 employees)
• Department store = 2 (total 5 toilets and 50 employees)
• Restaurants = 2 (total 500 meals a day)
• Shopping center = 1 (100 employees and 1000 parking space)
• Medical hospital = 1 (500 beds and 50 employees)
• Day school = 1 (with cafeteria, gym, showers and 1000 students)

Estimate the daily wastewater flow rate that can be expected from this city.

Question 4:

Sewers are to be installed in a camping area that contains

• a developed campground for 200 persons;
• lodges and cabins for 100 persons, and
• resort apartments for 50 persons.

Assume that persons staying in lodges use the dining hall for 3 meals per day and that a 5 seat cafeteria with 4 employees and an estimated 100 customers per day has been constructed. Daily attendance at visitor centre is expected to be 50 percent capacity. Other facilities include a 10 machine Laundry, and a 20 seat cocktail lounge. Determine the wastewater flow rate from this camping area in m³/d.

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