Two rivers meet at a confluence. River A is has a flow of 20m³/s, a DO level of 12mg/l and a five-day BOD of1mg/l. River B is polluted and has a flow of 30m³/s, a DO level of 4mg/l and a five-day BOD of 34mg/1. The rivervelocity downstream of the confluence is 0.5m/s. The saturated DO level in the river is 12.0 mg/l, the BODreaction rate constant is 0.25 day and the re-aeration constant of the river is 0.45 day¹.a) Calculate the minimum DO in the river and how far downstream of the confluence that this occurs.b) Describe 3 assumptions of this calculation that may differ in reality compared to our simplifiedmodelling.c) In up to 8 sentences, define 4 different types of water pollutants and describe their common sources,and consequencesd) Describe the role of water temperature in aggravating pollutant impact, and suggest how this could becontrolled from an industrial point of view

Given Data: River A QA=20m3/sDOA=12mg/lB0D=1mg/lRiver BQB=30m3/sDOB=4mg/lBOD= 34mg/lsat. DO level =…

Answered: Two rivers meet at a confluence. River…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A town on the bank of river Ganga discharges 18000 m³ day 1 of treated wastewater into the river. The treated wastewater has a BOD; of 20 mg L-1 and a BOD decay constant of 0.12 day-¹ at 20°C. The river has a flow rate of 0.43 m³ sec-1 and an ultimate BOD of 5.0 mg L-1. The DO of the river is 6.0 mg L-1 and the DO of the wastewater is 0.4 mg L-1. Compute the DO and initial ultimate BOD in the river, immediately after mixing.
Can you help me solve this question please? Thank you Salt lake has no outlet i.e., the inlet flow is completely balanced by evaporation. Lake has a volume of 2.5 x 1011 m3 and the concentration of salt in the lake is 52 g/L. Inlet stream to the lake has a concentration of 0.18 g/L and is flowing at a rate of 3.7 x 109 m3/yr. Lake initially had a concentration of 0.18 g/L and the outflow abruptly stopped, how long ago did that occur?
A waste water stream (flow = 2 m3/s), ultimate BOD = 90 mg/l is joining a small river (flow = 12 m³/s) ultimate BOD = 5 mg/I. Both water streams gets mixed up instantaneously. Cross-section area at the river is 50 m2. Assuming Deoxygenation constant = 0.251 day. Estimated downstream BOD of river flow.
The reservoir in Tisa, Labangon is supplied from a watershed having an area of 24 sq.km. The surface area of the reservoir is only 6% of the watershed area. For the month of July the rainfall was 35 mm. Assuming a rainfall coefficient of 82% and the evaporation from a free water surface to be 28 mm during the month. Compute the loss in the watershed in cu.m.
Compute the 4-hr Snyder's synthetic unit hydrograph for a watershed with an area of 27.8 square miles and a main channel length of 16.3 miles. The main channel length from the outlet to the point opposite the centroid of the watershed is 5.4 miles. The regional parameters are C₁ = 1.7 and C₂ = 0.5. Plot the resulting hydrograph and label the lagged time to peak (tr), time to peak (TDR). peak discharge (Q₂R), and time base (T₁). (similar to 8.4.4)
6. Runoff from a 200 mile² catchment drains into a reservoir than has an average surface area of 4000 acres. The reservoir is to be used for municipal water supply. Annual rainfall over the watershed is 40 inches and the annual runoff is 2 inches. Evaporation from the reservoir averages 40 inches per year. If the surface area of the reservoir is roughly constant with depth, how much will the reservoir depth change in one year?
If the Kuils River has a catchment area of 200 square kilometres and receives in a year 600 mm/year of rainfall, and the runoff from this catchment is 100 mm/year. Assuming that there is no loss to or gain of water from subsurface storage, the amount of evaporation isA) 400 mm/year, B) 500 mm/year, C) 300 mm/year D) 900 mm/year
Consider a regime channel having a discharge of 50 m3/s and silt factor 1.10. The hydraulic radius for the given channel is
Water flows in a horizontal, rectangular channel initially 10 feet wide and 2 feet deep. The initial velocity is 6 ft/s. This flow encounters downstream a simultaneous downward step and constriction. No energy losses are associated with these changes in channel configuration. a. What is the specific discharge, q: i. Upstream (for w= 10 feet)? ii. Downstream (for w = 6 feet)? b. What specific energy, E, is associated with the flow as initially specified (at the upstream location)? c. What is the minimum energy needed to pass the full discharge at the downstream location? d. What is the height (Az) of the smallest downward step necessary for the upstream flow conditions to remain as specified?
The initial rate of infiltration of a watershed is estimated as 53 mm/hr, the final capacity is 5 mm/hr, andthe hydraulic conductivity, k as 0.4hr-1. Use Horton’s equation to find: • The infiltration capacity at t = 3 hr and 6 hr• The total volume of water infiltrated over the 6-hr period.
Water depths in the upstream and on the crest of a hump were measured and they were 1.65 m and 0.435 m. Assuming that the choking effect already occurred on the hump and energy losses are negligible, what is the specific discharge and hump height in the channel? ( Show calculations and sketch) a) 0.9 m2/s and 1 m b) 1 m2/s and 0.9 m c) 1.2 m2/s and 1 m d) 1 m2/s and 1.2 m
Please provide an explanation for evry formula and solution. And be clear with your answer. In 1997, Upper Grand watershed near Maputi, Bukidnon with an area of 4350 sq.km received 77.7 cm of precipitation. The average rate of flow measured in the Grand River, which drained the watershed, was 39.6 cu.m/s. Infiltration was estimated to occur at an average rate of 9.2 x 10-7 cm/s. Evapotranspiration was estimated to be 45 cm/yr. What is the change in storage in the watershed in cm/yr. Also, calculate the runoff coefficient for this watershed.

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