Dr. Griffin's Distribution Page

You can access various problem topics by clicking on the following targets :

FILES DEVELOPED BY CURRENT AND FORMER STUDENTS


FILE	FILE DESCRIPTION AND DEVELOPER
A File from Katrina	Developed by Rel Gray, currently with Hunt-Guillot and Associates, Ruston, La This was done in response to a contract from development of temporary living quarters for victims of hurricane Katrina, posted Nov. 1, 2005
Drainage and Detention Basin Design	This file is several years old. It was done by Michael Foster. "Foster" did not like hydraulics/hydrology or Mathcad and said he wasn't going to work in the hydraulics area or with Mathcad after he left school, "he was going to do structures". He went to work for a firm that does structural work in the electrical power industry. Unknown to Foster, the firm also has responsibilty for drainage around their structures. This was Foster's first assignment. Moral of the story "In private industry you do what comes through the door"
Sizing of Culverts - Minimum Performance Approach	This file was produced by Lance Tyson in CVEN 411 (Fall 2005). It uses the minimum performance approach (FHWA) to size culverts. Posted Nov. 5, 2005. Nice use of conditional statements with text strings as output.
Sensitivity Analysis of the Green Ampt Infiltration Procedure	This file was produced by Joseph Bramande. He uses an "iterative input" into an Excel component to do a sensitivity analysis of the Green- Ampt infiltration procedure. Posted May 18, 2006, 9 am

**CHEMISTRY**
**(some are annotated better than others)**
File	Description of File
Strong acid strong base titration version 1 - solve block	Numerical solution of a strong acid strong base titration with associated plots
Strong Acid-Strong base titration version 2	This file details the development of the titration curve for a strong acid/strong base system. This file uses the "root function" rather than a solve block and results in a very general template .
chemistry problem	Total dissolved carbon in a solution in contact with solid calcite
PDF version of file above	PDF file of file above
Chemistry Problem	pH of rain water from an acid atmosphere
Chemistry Problem	partial pressure of CO₂ in solution
Chemistry	A discussion of alkalinity in natural waters
Sodium bicarbonate addition for pH control and buffering	This problem arose as a result of the need to predict the pH and alkalinity resulting from the addition of sodium bicarbonate to a low alkalinity well water. We defined a function, fct(Na), which calls a solve block for each dosage. Resulting pH and alkalinity plotted vs dosage.
Master Variable Diagram for H2S Species	Species concentrations as function of pH
Ammonia Speciation	Problem deals with computing the ammonia/ammonium distribution in water
H2S concentration in a section of Sewer	Calculations to determine the speciation of H₂ S in section of sewer. Comments on the practical use of such calculations
Solvent Spill	Calculations relating to evaparation of solvents after a spill
Fog	calculations dealing with pollutants in fog vapor
Alkalinity Equations	Numerical and analytical calculations for computing alkalinity
Development of alkalinity equations	Development of concepts and equations used to quantify alkalinity in natural waters
pH of weak acid solution - 2 weak acids	Numerical solution of the salts of 2 weak acids in water
Chemistry	Alkalinity of a sodium bicarbonate-sodium carbonate solution - solve block used
Examination of alkalinity variation in solution	Carbon at varying pH-alkalinity levels
System with constant carbon concentration	Find the partial pressure of an acidified system where the aqueous C concentration remains constant
NaOH added to CO₂ /water system	NaOH is added to a CO₂ /water system to produce NaHCO₃
Sodium hypochlorite added to water	The effect on pH of the addition of the salt of a weak acid to water
Magnesium precipitation	Effect of buffer on requirements for precipitation. Based on problem from Snoeyink and Jenkins text
How much Freon in the bottle ?	A neat applied problem using a little chemistry and a little thermodynamics. From the Environmental Organic Chemistry text by Schwarzenbach et al.
Spill of TCE and PER	Another neat problem from Environmental Organic Chemistry by Schwartzenbach, et.al , posted 5/1/03, 4:40 p.m.
Methyl Bromide on lettuce leaves	A very practical little problem from Schwartzenbach et al. but I'm not sure if my solution is correct. Anyone seeing a mistake is asked to email me. Posted 2/25/00 8:30 am
Stumm&Morgan/7-1_solubility_of_FeCO3.mcd	Solving for the soluble Fe⁺² concentration when the system contains a buffer system. Posted 12/15/01, 8:41 am.
9-6_iron_oxidation_kinetics.mcd	Problem illustrates that equilibrium calculations don't tell the whole story, posted 12/20/01, 7:15 am
8_1_biochemical_calculations_M@E.mc	A neat little problem from Metcalf and Eddy which draws together material from different areas to compute the oxygen requirement for metabolism of casein, posted 1/18/02, 1:45pm
A chemistry problem for engineers	Engineers are not chemists - this is a very simple little problem where I examine an often used approximation in acid-base chemistry. The use of Mathcad solve blocks does not require many of the assumptions made when solving chemistry problems manually or graphically.
Open system with solid phase	Here I solve an "open system" in contact with a solid phase for a range of the independent variable. I used a "solve block function" . This is an iterative form of a solve block not documented in Mathcad literature, at least not very well. Posted 4/6/03, 11:05 am
CO₂ transfer across lake surface	A problem from Stumm and Morgan's Text, posted 4/14/03, 12 noon
Computing the precipitation potential	Shows how to determine if CaCO₃ precipitation will occur and how much , posted 4/29/03, 3:30 pm
Scotch and Soda - the Hard Way	A neat Gibbs Free energy problem showing the location of the equilibrium point graphically. Posted 5/12/03 , 8:35 am
Monochloramine Kinetics	A kinetics problem dealing with chlorine residuals. Posted 5/14/03, 10:24 am

CHEMISTRY
(some are annotated better than others)

File

Description of File

Strong acid strong base titration
version 1 - solve block

Numerical solution of a strong acid strong base titration with associated plots

Strong Acid-Strong base titration version 2

This file details the development of the titration curve for a strong acid/strong base system. This file uses the "root function" rather than a solve block and results in a very general template .

chemistry problem

Total dissolved carbon in a solution in contact with solid calcite

PDF version of file above

PDF file of file above

Chemistry Problem

pH of rain water from an acid atmosphere

Chemistry Problem

partial pressure of CO₂ in solution

Chemistry

A discussion of alkalinity in natural waters

Sodium bicarbonate addition for pH control and buffering

This problem arose as a result of the need to predict the pH and alkalinity resulting from the addition of sodium bicarbonate to a low alkalinity well water. We defined a function, fct(Na), which calls a solve block for each dosage. Resulting pH and alkalinity plotted vs dosage.

Master Variable Diagram for H2S Species

Species concentrations as function of pH

Ammonia Speciation

Problem deals with computing the ammonia/ammonium distribution in water

H2S concentration in a section of Sewer

Calculations to determine the speciation of H₂ S in section of sewer. Comments on the practical use of such calculations

Solvent Spill

Calculations relating to evaparation of solvents after a spill

Fog

calculations dealing with pollutants in fog vapor

Alkalinity Equations

Numerical and analytical calculations for computing alkalinity

Development of alkalinity equations

Development of concepts and equations used to quantify alkalinity in natural waters

pH of weak acid solution - 2 weak acids

Numerical solution of the salts of 2 weak acids in water

Chemistry

Alkalinity of a sodium bicarbonate-sodium carbonate solution - solve block used

Examination of alkalinity variation in solution

Carbon at varying pH-alkalinity levels

System with constant carbon concentration

Find the partial pressure of an acidified system where the aqueous C concentration remains constant

NaOH added to CO₂ /water system

NaOH is added to a CO₂ /water system to produce NaHCO₃

Sodium hypochlorite added to water

The effect on pH of the addition of the salt of a weak acid to water

Magnesium precipitation

Effect of buffer on requirements for precipitation. Based on problem from Snoeyink and Jenkins text

How much Freon in the bottle ?

A neat applied problem using a little chemistry and a little thermodynamics. From the Environmental Organic Chemistry text by Schwarzenbach et al.

Spill of TCE and PER

Another neat problem from Environmental Organic Chemistry by Schwartzenbach, et.al , posted 5/1/03, 4:40 p.m.

Methyl Bromide on lettuce leaves

A very practical little problem from Schwartzenbach et al. but I'm not sure if my solution is correct. Anyone seeing a mistake is asked to email me. Posted 2/25/00 8:30 am

Stumm&Morgan/7-1_solubility_of_FeCO3.mcd

Solving for the soluble Fe⁺² concentration when the system contains a buffer system. Posted 12/15/01, 8:41 am.

9-6_iron_oxidation_kinetics.mcd

Problem illustrates that equilibrium calculations don't tell the whole story, posted 12/20/01, 7:15 am

8_1_biochemical_calculations_M@E.mc

A neat little problem from Metcalf and Eddy which draws together material from different areas to compute the oxygen requirement for metabolism of casein, posted 1/18/02, 1:45pm

A chemistry problem for engineers

Engineers are not chemists - this is a very simple little problem where I examine an often used approximation in acid-base chemistry. The use of Mathcad solve blocks does not require many of the assumptions made when solving chemistry problems manually or graphically.

Open system with solid phase

Here I solve an "open system" in contact with a solid phase for a range of the independent variable. I used a "solve block function" . This is an iterative form of a solve block not documented in Mathcad literature, at least not very well. Posted 4/6/03, 11:05 am

CO₂ transfer across lake surface

A problem from Stumm and Morgan's Text, posted 4/14/03, 12 noon

Computing the precipitation potential

Shows how to determine if CaCO₃ precipitation will occur and how much , posted 4/29/03, 3:30 pm

Scotch and Soda - the Hard Way

A neat Gibbs Free energy problem showing the location of the equilibrium point graphically. Posted 5/12/03 , 8:35 am

Monochloramine Kinetics

A kinetics problem dealing with chlorine residuals.
Posted 5/14/03, 10:24 am

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