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

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

ASparsely planted area

BDrip irrigation system

CHigh evapotranspiration rate

DRainwater harvesting system

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.

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31 comments · newest first

Maryann 6 months ago

True, but C is still the most direct reason for higher demand.

Alesia 6 months ago

But B is efficient! Drip irrigation saves water in the long run.

Stevie 7 months ago

D is interesting too. Rainwater harvesting can reduce demand overall.

Judy 7 months ago

C makes sense. Hot weather increases demand for irrigation.

Annice 7 months ago

I agree, A is not a good option. Sparsely planted areas use less water.

Gerald 7 months ago

D) Rainwater harvesting should help reduce demand, not increase it.

Malcolm 7 months ago

Totally agree with C, the heat really makes plants thirsty!

Mari 8 months ago

Surprised that A) Sparsely planted area would need more water!

Stephania 8 months ago

Haha, the answer is clearly C. Thirsty plants = more watering. Simple as that!

Laquita 8 months ago

C is the way to go. Anything that increases water loss means you need to use more for irrigation.

Loise 8 months ago

I'm going with C. Gotta keep those plants hydrated, am I right?

Lili 9 months ago

Definitely C. High evapotranspiration means more water is lost to the atmosphere, so you need to irrigate more.

Kent 9 months ago

C) High evapotranspiration rate is the correct answer. Increased evapotranspiration leads to higher water demand for irrigation.

Bo 9 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.

Glenn 9 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.

Sherman 9 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.

Aja 9 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.

Kayleigh 10 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.

Lino 10 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.

Kenny 10 months ago

I think the answer might be C) High evapotranspiration rate since that would mean more water is needed for crops.

Lanie 10 months ago

I think C is the best choice. High evapotranspiration means more water needed.

Ilona 10 months ago

C) High evapotranspiration rate definitely increases demand.

Cherry 11 months ago

I'll have to go with C. Evapotranspiration is the thirsty plant's worst enemy!

Gerald 11 months ago

I think B) Drip irrigation actually reduces demand, right?

Darrin 11 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.

Goldie 11 months ago

I think the answer is C. High evapotranspiration rate would lead to higher water demand for irrigation.

Sabra 5 months ago

↳ replying to Goldie

C is the clear choice. Evapotranspiration is key!

Dick 6 months ago

↳ replying to Goldie

True, but it doesn't change the demand. C is still higher.

Jovita 6 months ago

↳ replying to Goldie

But what about B? Drip irrigation saves water.

Shenika 6 months ago

↳ replying to Goldie

Definitely! Plants lose more water in high heat.

Carissa 6 months ago

↳ replying to Goldie

I agree, C makes sense. More evaporation means more water needed.

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