AIH Professional Hydrologist - Surface Water Examination study guide
AIH Professional Hydrologist - Surface Water Examination · Work through your exam, one topic at a time.
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 PH Exam is positioned for experienced professionals ready to demonstrate advanced knowledge and ethical leadership in the field; AIH also offers the Hydrologist-in-Training (HIT) Exam for emerging professionals and the Hydrologic Technician (HT) Exam for those with hands-on field experience. AIH states that its examinations test expertise in the fundamentals, surface water, and groundwater, and that certification is built on standards and procedures to certify individuals qualified to practice hydrology in the areas of surface water, groundwater, and water quality. The AIH Professional Hydrologist - Surface Water Examination study guide has 3 sections and about 878 words.
01Fundamentals of Hydrology: The Water Balance, Catchment Processes, and Flow Measurement
Nearly every fundamentals question reduces to the catchment water balance: P = ET + Q + ΔS, with P precipitation, ET evapotranspiration, Q runoff/streamflow, and ΔS change in storage (soil, groundwater, snow, channel). Candidates must be able to close the balance over a chosen period and recognize that ΔS ≈ 0 only for long multi-year averages, never for a single storm.
325 words, about 2 min02Surface Water Hydrology: Frequency Analysis, Routing, and Design Floods
A design flow with return period T has exceedance probability p = 1/T in any given year. The 100-year flood is not "once per century" but a 1% annual exceedance probability; two 100-year events can occur in consecutive years.
291 words, about 1 min03Groundwater Hydrology: Aquifer Properties, Darcy Flow, and Well Hydraulics
Distinguish porosity (total void fraction) from specific yield (drainable) and specific retention. Hydraulic conductivity K describes the medium–fluid combination; transmissivity T = K × saturated thickness b.
262 words, about 1 min