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US Green Building Council LEED-AP-BD+C Exam - Topic 5 Question 21 Discussion

Actual exam question for US Green Building Council's LEED-AP-BD+C exam
Question #: 21
Topic #: 5
[All LEED-AP-BD+C Questions]

Which of the following will result in a higher demand for potable water use in irrigation?

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Suggested Answer: C

The answer is C. A high evapotranspiration rate will result in a higher demand for potable water use in irrigation. Evapotranspiration is the process by which water is transferred from the land to the atmosphere by evaporation from the soil and other surfaces and by transpiration from plants. The higher the evapotranspiration rate, the more water is lost from the soil and plants, and the more irrigation is needed to replenish the moisture. The other options will not increase the demand for potable water use in irrigation. A sparsely planted area will have less vegetation and less transpiration, reducing the water demand. A drip irrigation system will deliver water directly to the plant roots, minimizing evaporation and runoff, and saving water. A rainwater harvesting system will collect and store rainwater for irrigation, reducing the reliance on potable water sources. For more information on outdoor water use reduction and irrigation efficiency, you can refer to the LEED v4 Reference Guide for Building Design and Construction1 or the WaterSense Water Budget Tool2.


by Malcom at Nov 25, 2025, 01:25 PM

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Maryann
5 days ago
True, but C is still the most direct reason for higher demand.
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Alesia
11 days ago
But B is efficient! Drip irrigation saves water in the long run.
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Stevie
16 days ago
D is interesting too. Rainwater harvesting can reduce demand overall.
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Judy
21 days ago
C makes sense. Hot weather increases demand for irrigation.
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Annice
26 days ago
I agree, A is not a good option. Sparsely planted areas use less water.
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Gerald
1 month ago
D) Rainwater harvesting should help reduce demand, not increase it.
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Malcolm
1 month ago
Totally agree with C, the heat really makes plants thirsty!
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Mari
2 months ago
Surprised that A) Sparsely planted area would need more water!
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Stephania
2 months ago
Haha, the answer is clearly C. Thirsty plants = more watering. Simple as that!
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Laquita
2 months ago
C is the way to go. Anything that increases water loss means you need to use more for irrigation.
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Loise
2 months ago
I'm going with C. Gotta keep those plants hydrated, am I right?
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Lili
3 months ago
Definitely C. High evapotranspiration means more water is lost to the atmosphere, so you need to irrigate more.
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Kent
3 months ago
C) High evapotranspiration rate is the correct answer. Increased evapotranspiration leads to higher water demand for irrigation.
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Bo
3 months ago
I’m confused about A) Sparsely planted area. Wouldn't that mean less water is needed? I guess I need to think this through more.
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Glenn
3 months ago
I feel like I’ve seen a question like this before, and it was about how environmental factors increase demand. C) High evapotranspiration rate sounds right to me.
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Sherman
3 months ago
I'm not entirely sure, but I remember something about irrigation systems. B) Drip irrigation system seems like it would use less water, not more.
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Aja
3 months ago
I'm a bit confused on this one. I'll need to review my notes on irrigation systems and water usage factors. Maybe I can eliminate a couple of the options first before making a final decision.
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Kayleigh
4 months ago
I'm pretty confident that C is the right answer. High evapotranspiration means more water is lost from the soil and plants, so the irrigation system would need to supply more to meet the demand.
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Lino
4 months ago
Okay, let's see. A sparsely planted area would likely need less water, and a rainwater harvesting system would reduce the need for potable water. So I'm leaning towards C or B as the answer.
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Kenny
4 months ago
I think the answer might be C) High evapotranspiration rate since that would mean more water is needed for crops.
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Lanie
4 months ago
I think C is the best choice. High evapotranspiration means more water needed.
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Ilona
4 months ago
C) High evapotranspiration rate definitely increases demand.
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Cherry
5 months ago
I'll have to go with C. Evapotranspiration is the thirsty plant's worst enemy!
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Gerald
5 months ago
I think B) Drip irrigation actually reduces demand, right?
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Darrin
5 months ago
Hmm, I'm not sure. I'll need to think through the options carefully. Maybe I should start by considering how each factor affects water usage.
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Goldie
5 months ago
I think the answer is C. High evapotranspiration rate would lead to higher water demand for irrigation.
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Carissa
5 hours ago
I agree, C makes sense. More evaporation means more water needed.
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