Well hydraulics (geology 5251; fall 2019) homework #1: hydraulic head (45 pts. total; due friday, sept. 6) 1 (5 pts.): consider a domestic well at the base of a hill. the well screen is at a depth of 18 m below the land surface; the land surface has an elevation of 200 m asl. a transducer at the base of the well records a water pressure of 2-10 pa (recall the mks units of pressure: 1 pa 1 pascal 1 n m 2). the top of the well is flush with the land surface. to what height will water rise in the well? what would this system 'look like' in the real world, i. e. what would you see if you stumbled upon such a well? 2 (15 pts.): the stratigraphy in northern minnesota consists of upper and lower sandy tills (aquifers) separated by a clay-rich ill (confining unit). piezometer nest b is located 1 km north of piezometer nest a. each nest consists of shallow and deep piezometers with screens set in the upper and lower aquifers, respectively. piezometers tops are flush with the land surface. data for nest a: elevation of the land surface 200 m asl; depth to top of confining unit 10 m thickness of confining unit = 2 m; depth of shallow well screen 7 m; depth to water in shallow well = 3 m; depth of deep well screen 14 m; depth to water in deep well 4 m. data for nest b: elevation of the land surface 202 m asl; depth to top of confining unit 11 m; thickness of confining unit = 3 m; depth of shallow well screen 8 m; depth to water in shallow well =3 m; depth of deep well screen 17 m; depth to water in deep well 5 m. do the following: (1) sketch the system in cross section; (2) compute the elevation, pressure and total head in each piezometer; (3) compute the lateral hydraulic gradients in the upper and lower aquifers; (4) indicate graphically (arrows! ) the direction of lateral groundwater flow in the upper and lower aquifers; (5) indicate clearly the direction of vertical groundwater flow across the confining unit at each piezometer nest; (6) based on your results, speculate as to your 'location' in a typical shallow groundwater flow system, i. e. are you in a recharge zone or a discharge zone (near a river)?