AIH Professional Hydrologist - Surface Water Examination case studies
AIH Professional Hydrologist - Surface Water Examination · Put your knowledge to work in context.
The Professional Hydrologist (PH) credential is awarded 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 itself as the only nationwide organization that offers certification to qualified hydrologic professionals, and its exams focus exclusively on knowledge and understanding of hydrology rather than broader environmental or engineering practice. The AIH Professional Hydrologist - Surface Water Examination case studies are 5 cases and about 2,211 words.
1Unit Hydrograph Transfer to an Ungauged Tributary
A 240 km² gauged catchment has 12 years of record and a derived 1-hour unit hydrograph with peak 38 m³/s and time-to-peak 6 h. A proposed 95 km² tributary within the same physiographic region has no streamflow record.
508 words, about 3 min2Rating Curve Shift After a Channel-Forming Flood
A gauging station uses a stable-control rating curve developed over 8 years, with discharge Q = 42(h − 0.30)^1.62 (h in m, Q in m³/s). A channel-forming flood scours the control section.
456 words, about 2 min3Baseflow Separation Disagreement for a Water-Budget Permit
A 180 km² catchment must demonstrate baseflow to support a downstream minimum-flow permit. Annual precipitation is 1,150 mm; estimated actual evapotranspiration is 620 mm.
420 words, about 2 min4Pumping Test Interpretation in a Layered Aquifer
A 24-hour constant-rate pumping test at 1,800 m³/d in a confined sand aquifer shows drawdown that plots as a straight line on semi-log axes for the first 6 hours, then steepens and curves. A nearby observation well 60 m away shows delayed drawdown beginning at ~7 hours.
424 words, about 2 min5Design Storm Selection for a Small Urban Catchment
A 12 km² urbanizing catchment needs a design peak flow for a culvert. Available data: 9 years of peak-flow record (too short for at-site frequency analysis), and a regional regression equation for the 100-year peak.
403 words, about 2 min