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# HYDROGEOLOGY GEOL 410

Texas A&M

GPA 3.78

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This 5 page Class Notes was uploaded by Antonette Purdy MD on Wednesday October 21, 2015. The Class Notes belongs to GEOL 410 at Texas A&M University taught by Hong-Bin Zhan in Fall. Since its upload, it has received 36 views. For similar materials see /class/225974/geol-410-texas-a-m-university in Geology at Texas A&M University.

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Date Created: 10/21/15

l Hyd Midterm review Geol 410 Hydrogeology rological cycle global hydrological cycle equation and groundwater hydrological cycle equation distribution of fresh water in glacial ice groundwater lakes and reservoir atmosphere moisture and river overland ow run off inter ow and base flow base ow recession calculation ofbase ow recession start ofbase flow recession and end ofbase ow recession capillary rise potential evapotranspiration and actual evapotranspiration in different regions desert US East etc in ltration calculation and in ltration capacity 2 Porosity and its change 3 Hyd total porosity and effective porosity difference of porosity and void ratio if porosity is given how to nd void ratio etc some typical porosities and effective porosities of several rock types concept of aquifer aquitard and aquiclude porosity reduction by compaction and pressure solution what is pressure solution How do the porosities of shale and sandstone change differently with depth pore pressure coef cient 1 dp do where p is the uid pressure and cris the total stress What are the typical values of Zfor clay or siltstone or mudstone limestone sandstone you just need to know the relative value not exactly number If Zwl is it hard rock or soft rock primary porosity and secondary porosity carbonate rocks raulic head Darcy s Law and Ground water motion Darcy s experiment and Darcy s law speci c discharge and total discharge what are the units relationship between speci c discharge and pore ow velocity hydraulic conductivity what is its unit hydraulic head pressure head and elevation head nding those three heads from piezometer measurement given land surface elevation depth of piezometer and depth to piezometer nd horizontal ow and vertical flow using a group of piezometers hydraulic gradient magnitude and direction Given three hydraulic heads at three locations how to nd equipotential lines ow lines and hydraulic gradient in a homogeneous isotropic aquifer water table for uncon ned aquifer and piezometric head con ned aquifer general form of Darcy s law If Ky 0 orKXZ 0 what does it mean ah ah ah a 6x W 6y 2 62 difference of permeability and hydraulic conductivity What are their units why a larger grain size medium has a larger permeability mapping piezometric surface and water table nd flow direction recharge zone discharge zone qr E Midterm review Geol 410 Hydrogeology using Darcy s Law to calculate horizontal ow vertical ow leakage between two adjacent aquifer when leakage happens between two aquifers what do the ow rate changes in these two aquifers what do the hydraulic heads change with distance Ground water motion equation and ow nets how does the groundwater ow equation come from you don t need to repeat the details of calculation I show in the class but should know the principles used there ow equations for steadyistate problems heterogeneous and anisotropic media heterogeneous and isotropic media homogeneous and anisotropic media homogeneous and isotropic media speci c storage coef cient Ss speci c storatiVity and storatiVity S what are the physical de nitions of these two concepts How to use these concepts to calculate the water released from aquifers Speci c yield Sy and its difference to storatiVity What are the dimensions of Ss S and Sy relationship between Ss and compressibilities of water and aquifer why to call aquifers as elastic media difference of hydraulic conductivity and transmissivity total stress effective stress and neutral stress uid pressure How to calculate total stress effective stress and neutral stress in a con ned aquifer and in a watertable aquifer M need to know the 39 verv well what happens when water table or piezometric head rise or fall what causes subsidence how to construct a ow net How to nd ow rate when given a ow net what do the ow nets look like in anisotropic media what do the noi ow boundary constanthead boundary and water table look like in a ow net tangent refraction law and its application in groundwater ow in the basin scale what happens when groundwater ows from a low permeability zone to a high permeability zone How to calculate the speci c discharge in the high permeability zone if the speci c discharge in the low permeability zone is known For a multilayer aquifers how to calculate the average horizontal and average vertical hydraulic conductivities Why we say that microscopic layering can cause macroscopic anisotropy What dominates the horizontal ow in a multiilayer aquifer What dominates the vertical ow in a multiilayer aquifer Given a two or three layer aquifer if ow is vertical and the heads at the top and bottom are given and the hydraulic conductivities are given how to find the heads at the internal boundaries How to nd the vertical ow rate Given a two or three layer aquifer if ow is horizontal and the heads at the left and right are given and the hydraulic conductivities are given how to nd the distribution of ow rates at different layers I Final Review Geol 410 Masure Hvdraulic F 39 39 in the Lab Constanthead perrneameter fallinghead perrneameter Basin scale owl Engineering agglication of hydrogeologx l Basin scale ow local intermediate regional ow water divide recharge zone and discharge zone of the basin 2 Effects of basin geometry and geology on basin scale ow 3 What is seawater intrusion What is GhybenHerzberg Relation How to calculate the fresh watersea water interface 4 How to calculate the toe of saltwater wedge in a con ned coastal aquifer 5 What is the environmental impact of a dam What happens during the ooding and after ooding in a river 6 Land slide and slope stability Hydraulic Testing and Subsidence 8 Drawdowntime relationship How to calculate the drawdown for a con ned aquifer a leaky con ned aquifer and a water table aquifer 9 What is Theis equation and Theis curve What is CooperJacob Equation What is the difference between Theis and CooperJacob equations 10 What are the assumptions used to derive Theis equation 11 How to interpret the pumping data Matching point method drawdowntime method drawdowndistance method 12 To use the drawdowndistance method at least how many monitoring wells are needed What are the requirement for the distances from those monitoring wells to the pumping wells 13 What are the differences of well functions of a con ned leaky and a water table aquifer 14 Multiple pumping well single monitoring well superposition 15 Drawdowntime curve in a water table aquifer How to nd Kh SS Sy KV where Khorizontal conductivity Ssspeci c storativity Syspeci c storativity Kvwertical conductivity l6 Shut down of a pumping well and residual drawdown in the recovery period 17 How to calculate the drawdown if the pumping rate is changed from Q1 to Q2 18 Slug test How does it work What can we nd from it and How to nd it 19 Well ef ciency formation loss well loss what formula what is the well loss constant if change the pumping rate what is the change of formation loss well loss and well ef ciency 20 What is Speci c Capacity What is it for 21 What is the stepdrawdowntest What is it for 22 Image well problem constant head boundary no ow boundary coeXist of constant head and no ow boundaries 23 What is the semilog drawdowntime curve if a no ow boundary or a constant head boundary is nearby the pumping well 24 Flow to a partially penetrating well 25 What causes subsidence How we handle the subsidence physically in this class 26 How to calculate the subsidence for a clayaquifer system or for an aquiferclayaquifer system Final Dec 16 Tuesday 810AM 2003 Final Review Geol 410 Speci c storatiVityI storatiVityI speci c eldI and goundwater water ow eguation 1 What is the de nition of the speci c storativity What are storativity What is speci c yield 2 How is the speci c storativity related to compressibility of water and media How does this parameter vary with the rock type clay siltstone sandstone limestone granite etc E How to use above three concepts to compute the water released from an aquifer after drop of hydraulic head How does the groundwater ow equation come from you don t need to repeat the details of calculation I show in the class but should know the principles used there 4 UI Why we need such an equation to use the equation we need boundary condition and initial condition if it is a transient ow problem ON What are the simpli ed equations for steadyistate problems heterogeneous and anisotropic media heterogeneous and isotropic media homogeneous and anisotropic media homogeneous and isotropic media gt1 What is the 2D ow equation in a con ned aquifer 9 What is the 2D ow equation in an uncon ned aquifer 0 Flow to drains at the same elevation when recharge is presented What does the hydraulic head between two drains look like How is ow to the drain associated with recharge Flow to a Well and Hvdraulic Testing 1 Steadystate groundwater ow to a well in a con ned aquifer 2 Steadystate groundwater ow to a well in an uncon ned aquifer 3 How to nd transmissivity andor hydraulic conductivity by using the steadystate ow solutions 4 For transient ow how to calculate the drawdown for a con ned aquifer a leaky con ned aquifer and a water table aquifer 5 What is Theis equation and Theis curve What is CooperJacob Equation What is the difference between Theis and CooperJacob equations 6 What are the assumptions used to derive Theis equation 7 How to interpret the pumping data Matching point method drawdowntime method drawdowndistance method 8 To use the drawdowndistance method at least how many monitoring wells are needed 9 How to calculate the drawdown if multiple pumping wells are used superposition 10 How to deal with shut down of a pumping well and residual drawdown in the recovery period 11 How to calculate the drawdown if the pumping rate is changed from Q1 to Q2 at time t1 then from Q2 to Q3 at time t2 12 How to deal with partial penetrating pumping well LA UI D ID I ION 00 O N Final Review Geol 410 What is wellbore storage and how will it affect the drawdown Why we need to worry about well loss when measure the drawdown inside the pumping well What is well efficiency formation loss well loss and total loss if change the pumping rate what is the change of formation loss well loss total loss and well efficiency What is well capacity How to calculate the drawdown if a river constanthead boundary or bedrock or a fault a no ow boundary is nearby What is the drawdowntime curve looks like if pumping is conduced near a river in a loglog paper and in a semilog paper What is the drawdowntime curve looks like if pumping is conduced near a fault or bedrock in a loglog paper and in a semilog paper How does slug test work What can we find from it and How to find it What is the difference between a pumping test and a slug test

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