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13 Sep 2026, 05:19
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Tab 1 says:
Whenever possible, the engineers are expected to keep the reservoir depth within a certain 23 meter allowable range - high enough to support recreational activities and not above the reservoir's maximum allowable depth - and to keep the outflow rates within a certain 25 cubic meters per second (m3/s) allowable range.
Tab 2 mentions the range of outflow rates to be maintained at all times (85 to 110 m3/s).
Outflow rates are meant to be kept within that range. If the engineers stop the outflow, during that time, the outflow rate is 0. This, in essence, is a breaking of the given constraint.
qwertcr7
14 Sep 2026, 11:59
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Hi qwertcr7,
You've read Figures 1 and 2 correctly, and your instinct about balancing water is exactly the right way to think. The one piece slipping through is a hard limit in Tab 2 (Constraints).
Engineers cannot stop the outflow. Tab 2 says the outflow rate must stay between 85 and 110 m3/s - 85 is a floor, not a suggestion. "Stopping outflow" would mean 0 m3/s, which breaks that constraint. And the whole question is about staying within the given constraints, so setting outflow to 0 isn't an option the engineers are allowed to use.
Now join that with the numbers:
- From Tab 3 / Figure 1, normal inflow runs about 95-105 m3/s.
- Reduce that permanently by 50, and inflow drops to roughly 45-55 m3/s.
- The lowest outflow the engineers may set is 85 m3/s (Tab 2).
So even at their minimum legal outflow (85), water leaves faster than it arrives (~50). Outflow always exceeds inflow, so the depth keeps falling day after day until it drops below the 195 m minimum in Tab 2. That's the permanent, long-term breach - Yes.
The reason "just stop the outflow" feels like a fix is that the passage lets engineers vary the outflow - but only inside the 85-110 band. Take that floor away and your reasoning would be perfectly valid; the floor is exactly what makes the reduction fatal.
Quick gut check: picture a bathtub whose drain can never be closed below a fixed trickle. If the tap slows to less than that trickle, the tub empties no matter what you do - that's the reservoir here.
Answer: Yes, No, No
You've read Figures 1 and 2 correctly, and your instinct about balancing water is exactly the right way to think. The one piece slipping through is a hard limit in Tab 2 (Constraints).
Engineers cannot stop the outflow. Tab 2 says the outflow rate must stay between 85 and 110 m3/s - 85 is a floor, not a suggestion. "Stopping outflow" would mean 0 m3/s, which breaks that constraint. And the whole question is about staying within the given constraints, so setting outflow to 0 isn't an option the engineers are allowed to use.
Now join that with the numbers:
- From Tab 3 / Figure 1, normal inflow runs about 95-105 m3/s.
- Reduce that permanently by 50, and inflow drops to roughly 45-55 m3/s.
- The lowest outflow the engineers may set is 85 m3/s (Tab 2).
So even at their minimum legal outflow (85), water leaves faster than it arrives (~50). Outflow always exceeds inflow, so the depth keeps falling day after day until it drops below the 195 m minimum in Tab 2. That's the permanent, long-term breach - Yes.
The reason "just stop the outflow" feels like a fix is that the passage lets engineers vary the outflow - but only inside the 85-110 band. Take that floor away and your reasoning would be perfectly valid; the floor is exactly what makes the reduction fatal.
Quick gut check: picture a bathtub whose drain can never be closed below a fixed trickle. If the tap slows to less than that trickle, the tub empties no matter what you do - that's the reservoir here.
Answer: Yes, No, No
qwertcr7
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17 Sep 2026, 11:54
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All correct Voila!!
