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Water Budget Tutorial

1. The document provides 7 questions related to calculating water budgets and storage changes for lakes, reservoirs, and river reaches based on information about inflows, outflows, rainfall, evaporation, and surface areas. 2. The questions require calculating things like changes in water surface elevation of a lake over a month based on rainfall, evaporation, inflows and outflows, the amount of water unavailable for runoff from a catchment after a storm, and the storage change in a river reach over time given average inflows and outflows. 3. The document presents water budget calculations and questions that assess understanding of how water is stored and moves through different hydrological systems.

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Goodluck Nyagyb
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93 views1 page

Water Budget Tutorial

1. The document provides 7 questions related to calculating water budgets and storage changes for lakes, reservoirs, and river reaches based on information about inflows, outflows, rainfall, evaporation, and surface areas. 2. The questions require calculating things like changes in water surface elevation of a lake over a month based on rainfall, evaporation, inflows and outflows, the amount of water unavailable for runoff from a catchment after a storm, and the storage change in a river reach over time given average inflows and outflows. 3. The document presents water budget calculations and questions that assess understanding of how water is stored and moves through different hydrological systems.

Uploaded by

Goodluck Nyagyb
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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MISUNGWI COMMUNITY DEVELOPMENT TECHNICAL TRAINING INSTITUTE

HYDROLOGY (CET 06107)


WATER BUDGET - TUTORIAL
QUESTIONS:
1. A Lake Victoria had a water surface elevation of 100 m above datum at the
beginning of December (2020). In that month the lake received an average inflow
of 10 m3/s from surface runoff sources. In the same period the outflow from the
lake had an average value of 9.5 m3/s. Further, in that month, the lake received a
rainfall of 150 mm and the evaporation from the lake surface was estimated as
8 cm. Calculate the water surface elevation of the lake at the end of the month.
The average lake surface area can be taken as 8000 ha. Assume no groundwater
storage contribution.

2. A small catchment of area 200 ha received a rainfall of 20.5 cm in 180 minutes


due to a storm. At the outlet of the catchment. The stream draining the catchment
was dry before the storm and experienced a runoff lasting for 20 hours with an
average discharge of 3 m3/s. The stream was again dry after the runoff event.
a) What is the amount of water which was not available to runoff due to
combined effect of infiltration, evaporation, and transpiration?
b) What is the ratio of runoff to precipitation?

3. Water at a constant rate of 300 cumecs was observed to be entering into Mitindo
reservoir in a early November. If the infiltration and evaporation loss is 200
cumecs, find out the change in storage (ha.m) of reservoir for 7 days.

4. Flow of River at point A, upstream varied linearly from 60 cumecs to 230 cumecs
in 8 hours during a flood. The flow variation at B, downstream was observed to
be from 40 to 215 cumecs during the same time as above. What will be the total
change in storage of the reach in the mentioned period?

5. Thirty and half millimeters of storage change per day over an area of 160 km2 is
equivalent to average rate of how many cubic metre per second of water to that
area?

6. Estimate the rate of leaving from a 1400 ha reservoir in a month of 31 days during
which the reservoir level dropped by 0.80 m spitefulness of an average inflow into
the reservoir of 0.65 mm3/day. During the month the average seepage loss from
the reservoir was 3 cm, total precipitation on the reservoir was 20 cm and the total
evaporation was 10 cm.

7. A Rufiji river reach had a flood wave passing through it. At a given instant the
storage of water in the reach was estimated as 18 ha.m. What would be the
storage in the reach after an interval of 5 hours if the average inflow and outflow
during the time period are 15 m3/s and 12 m3/s respectively?

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