Question

For a given month (30 days): a 20 Km2 lake has 5 m3/s inflow, 4
m3/sec outflow, and total storage increases of 1.2X106 m3. Monthly
precipitation on the lake is 12 mm. Assuming the infiltration is
insignificant for the lake, determine the evaporation loss in (mm)
from the lake.

Part. 2 (2.5 marks): The evaporation rate from the surface of a 160
m2 lake is 436 m/day. Estimate the depth change in the lake in feet
during a 1-year period if the net inflow to the lake is 25
mm3/sec.

Answer #1

A lake has a surface area of 2 km2. During the month
of June (30-day), the inflow rate (I) to the lake was 1.0
m3/s and outflow rate (Q) from the lake was 0.75
m3/s. During this period, the total amount of
precipitation (P) on the lake surface was 10 cm, the total amount
of evaporation (E) was measured at a nearby pan as 15 cm. (The pan
coefficient is 0.7)
Calculate the storage change (ΔS) for this period in...

A dam lake with 21.1 km2 basin area with flow coefficient of 0.1
and with 11.7 km2 surface area, It is fed from a flow in September
with an average flow rate of 1.1 m3 / sec . During this
month,precipitation with a 71 mm high was observed in the region .
Evaporation measured in the evaporation pan in September, with the
basin coefficient of 0.8, amount is 71 cm. A total of 1.1* 0^6 m3
from the lake for...

4. [20] Lake Kickapoo, TX, is approximately 12 km in length by
2.5 km in width. The inflow for the mouth of April is 3.26 m3 /s
and the outflow is 2.93 m3 /s. The total monthly precipitation is
15.2 cm and the evaporation is 10.2 cm. The net seepage out of the
lake is estimated to be 2.5 cm. Evapotranspiration and runoff can
be neglected. Estimate the change in storage during the month of
April.

A lake whose surface area could be approximated to be circular
with a diameter of 2750 m has a water surface elevation of 128.917m
at the beginning of the month of August.During that month the lake
received a streamflow of 172 mm from a catchment of 6225 ha. The
average precipitation during the month was 181 mm, and the average
rate of evaporation was to be 5mm/d. The monthly seepage was 30 mm.
The average outflow from the lake during...

3. [20] You have been conducting a water quality study of Lake
Arjun, which has a surface area of 8.9 ×105 m2 . The average depth
of the lake is 9 m. The lake is fed by a stream having a flow rate
of 1.02 m3 /s and a phosphorus concentration of 0.023 mg/L. Runoff
from the homes along the lake adds phosphorus at an average annual
rate of 1.25 g/s. The river flows from the lake at a flow...

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