A Done Already B Confident C Could read

A. Done Already B. Confident C. Could read text and figure out D. Unsure – need help E. Clueless how to start

A. Done Already B. Confident C. Could read text and figure out D. Unsure – need help E. Clueless how to start Use the USGS NWIS website http: //waterdata. usgs. gov/. For the gage you choose give the following a) Use computer screen captures to give a map showing the location of the gage you selected b) A hydrograph plot of streamflow at this stream gage (computer screen capture from website) c) Watershed area, d) Mean annual discharge, e) Months with highest and lowest mean of monthly discharges f) The maximum discharge on record and the date that this occurred g) The ratio of highest mean monthly discharge to lowest mean monthly discharge. Comment on the seasonal cycle of discharge at this gage. h) Compute the mean annual runoff expressed as a depth (yearly discharge volume/area).

A. Done Already B. Confident C. Could read text and figure out D. Unsure – need help E. Clueless how to start

Groundwater Learning objectives • Be able to quantify the properties of water held in and flowing through the subsurface (soil and rock). The properties of interest include – – – porosity, moisture content, pressure, suction, hydraulic conductivity Mays Chapter 2

Schematic cross section illustrating unconfined and confined aquifers From Mays, 2011, Ground and Surface Water Hydrology

Soil properties related to water Porosity Volumetric Water Content Gravimetric Water Content Saturation Percentage

Example 2. 2. 1 An undisturbed sample of a medium sand weighs 484. 68 g. The core is 6 cm in dia and 10. 61 cm high. After oven drying the core weighs 447. 32 g. Determine the bulk density, void ratio, water content and saturation percentage of the soil.

Text Correction

0. 002 mm 0. 05 mm 2 mm , Uni form ly g rade d sa nd nd a s ilt, re s ed ixtu d a r ll g vel m e W gra Illustrative grain-size distribution curves. The boundaries between size classes designated as clay, silt, sand gravel are shown as vertical lines.

Soil Texture Triangle From Mays, 2011, Ground and Surface Water Hydrology

Macroscopic and microscopic concepts of a porous medium. (from Freeze and Cherry, 1979)