AIH Fundamentals of Hydrology Examination case studies
AIH Fundamentals of Hydrology Examination · Put your knowledge to work in context.
The AIH Fundamental Exam is an entry-level hydrology examination offered by the American Institute of Hydrology (AIH), a non-profit scientific and educational organization founded in 1981 and incorporated in Minnesota on March 3, 1981. AIH describes its examinations as focusing exclusively on knowledge and understanding of hydrology, testing expertise in the fundamentals, surface water, and groundwater. The AIH Fundamentals of Hydrology Examination case studies are 6 cases and about 3,106 words.
1Peak Flow Estimate for an Ungauged Culvert Site
A 3.2 km² catchment drains to a proposed culvert on a small stream. There is no stream gauge, but a rain gauge 4 km away records a 24-hour storm of 95 mm, of which the first 20 mm is lost to interception and infiltration before runoff begins.
514 words, about 3 min2Baseflow Separation and Recession Interpretation
A 45 km² catchment has a continuous 6-month streamflow record. Total flow at the start of a dry spell is 2.4 m³/s and declines smoothly over 30 days to 0.6 m³/s.
427 words, about 2 min3Flood Frequency with a Short and Inconsistent Record
A river has 22 years of annual peak-flow records. The two highest peaks (3,100 and 2,850 m³/s) occurred in the last 5 years; the rest range from 400 to 1,600 m³/s.
454 words, about 2 min4Pumping Test Interpretation and Well Interference
A confined sand-and-gravel aquifer is 18 m thick. A pumping well is pumped at 25 L/s for 24 hours, and observation wells at 15 m and 60 m show drawdowns of 4.2 m and 1.1 m respectively at the end of pumping.
651 words, about 3 min5Urban Catchment Stormwater Detention Sizing
A 12 ha development is 70% impervious (CN 92) and 30% pervious lawn (CN 61). Pre-development the site was all pasture (CN 70).
563 words, about 3 min6Groundwater Contamination Plume and Monitoring Strategy
A shallow unconfined sandy aquifer (hydraulic conductivity 8 m/day, hydraulic gradient 0.004, porosity 0.30) underlies a site where a solvent spill occurred. A monitoring well 50 m downgradient shows a concentration of 40 µg/L; a well 120 m downgradient shows 3 µg/L.
497 words, about 2 min