In response to the city of OHEB's discharge of raw sewage, the town of HALO has complained to the DENR that the city is limiting its usage of the RODON River. The 5.00 mg/L dissolved oxygen DENR water quality standard for the RODON River. The distance between HALO town and OHEB city is 15.5 kilometers. The statistics listed below are relevant to the 7-year, 10-day low flow in OHEB City. Use at least three (3) significant figures to express your calculated numbers. Parameter Flow (m³/s) BOD, at (mg/L) BODU at (mg/L) DO (mg/L) ka at 20°C (d-¹) Speed (m/s) Depth (m) Temperature (°C) DO sat (mg/L) Waste water from OHEB CITY 0.1507 128.00 N/A 1.00 0.4375 N/A N/A 28 N/A RODON RIVER 1.08 N/A 11.40 7.95 N/A 0.39 2.80 28 7.84 a. What is the DO concentration of the river at the city of HALO (mg/L)? Express your computed values in at least four (4) significant figures Ans: DO = 1.239 mg/L b. What is the critical DO (DOmin) concentration and where (at what distance x) downstream does it occur? Ans: DOmin = zero tc = 0.6915 days, Xc = 21 km
In response to the city of OHEB's discharge of raw sewage, the town of HALO has complained to the DENR that the city is limiting its usage of the RODON River. The 5.00 mg/L dissolved oxygen DENR water quality standard for the RODON River. The distance between HALO town and OHEB city is 15.5 kilometers. The statistics listed below are relevant to the 7-year, 10-day low flow in OHEB City. Use at least three (3) significant figures to express your calculated numbers. Parameter Flow (m³/s) BOD, at (mg/L) BODU at (mg/L) DO (mg/L) ka at 20°C (d-¹) Speed (m/s) Depth (m) Temperature (°C) DO sat (mg/L) Waste water from OHEB CITY 0.1507 128.00 N/A 1.00 0.4375 N/A N/A 28 N/A RODON RIVER 1.08 N/A 11.40 7.95 N/A 0.39 2.80 28 7.84 a. What is the DO concentration of the river at the city of HALO (mg/L)? Express your computed values in at least four (4) significant figures Ans: DO = 1.239 mg/L b. What is the critical DO (DOmin) concentration and where (at what distance x) downstream does it occur? Ans: DOmin = zero tc = 0.6915 days, Xc = 21 km
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:In response to the city of OHEB's discharge of raw sewage, the town of HALO has complained to the
DENR that the city is limiting its usage of the RODON River. The 5.00 mg/L dissolved oxygen DENR
water quality standard for the RODON River. The distance between HALO town and OHEB city is 15.5
kilometers. The statistics listed below are relevant to the 7-year, 10-day low flow in OHEB City. Use at
least three (3) significant figures to express your calculated numbers.
Parameter
Flow (m³/s)
BOD5 at (mg/L)
BODU at (mg/L)
DO (mg/L)
ka at 20°C (d-¹)
Speed (m/s)
Depth (m)
Temperature (°C)
DO sat (mg/L)
Waste water from OHEB CITY
0.1507
128.00
N/A
1.00
0.4375
N/A
N/A
28
N/A
RODON RIVER
1.08
N/A
11.40
7.95
N/A
0.39
2.80
28
7.84
a.
What is the DO concentration of the river at the city of HALO (mg/L)? Express your computed
values in at least four (4) significant figures Ans: DO = 1.239 mg/L
b.
What is the critical DO (DOmin) concentration and where (at what distance x) downstream does
it occur? Ans: DOmin = zero tc = 0.6915 days, Xc = 21 km
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