Runoff Recharge Evapotranspiration GWD m 3 /m/d Rain 7.5x10 6 m 3 - - PowerPoint PPT Presentation

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Jun 30, 2023 21 likes •214 views

Runoff Recharge Evapotranspiration GWD m 3 /m/d Rain 7.5x10 6 m 3 /d GWD m 3 /d SGD Stream 310,000 300,000 Kah NKB HFP 210,000 W PH BP 68,000 62,730 55,000 15,500 12,600 6,850 2,500 2,100 - KahanaB NorthKaneoheB

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Recharge Evapotranspiration Runoff Rain 7.5x106 m3/d

GWD m3/m/d GWD m3/d

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62,730 310,000 2,500 15,500 300,000 12,600 55,000 68,000 2,100

210,000

6,850 KahanaB NorthKaneoheB HeeiaFishpond BlackP PearlH Waimanalo

SGD Stream Kah NKB HFP W BP PH

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Leta et al., 2015

ANNUAL WATER BUDGET (mm)

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High-level aquifer - Wells, Springs Water Age: 40 ± 5 yrs Recharge elevation: 850 ± 150 m Wetland groundwater Water Age: 39 ± 15 yrs Recharge elevation: 330 ± 250 m Wetland surface water 10-50 % groundwater fed Recharge elevation: 420 ± 240 m

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Stream 2,100 m3/day Fresh SGD 317 m3/day Brackish SGD 2,200 m3/day Fishpond water residence time 2-6 days

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> 1 groundwater dominates

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N N N N Freshwater N >> Saltwater N Freshwater N ~ Saltwater N C Salinity

Sediment-water interface

C Salinity

Sediment-water interface

SGD source of allochthonous terrestrial nutrients SGD source of allochthonous terrestrial and autochthonous recycled nutrients

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R = I Q – C Q Q = QSGD+QR = 4,640 m3/day Concentration = 16 mmol/m3 Intercept = 0.6 mmol/m3 Removal = 71 mol/day

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62,730 310,000 2,500 15,500 300,000 12,600 55,000 68,000 2,100

210,000

6,850 KahanaB NorthKaneoheB HeeiaFishpond BlackP PearlH Waimanalo

SGD Stream

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