Grade 9 Lesson plan
Halcyon Ridge Stormwater: A Rational-Method Runoff Lesson
A 50-minute grade 9 lesson where students use the rational method Q = C i A to compare runoff from pavement and lawn at Halcyon Ridge and size a rain garden.
Water Math · Grade 9
Students practice grade-level mathematics on real utility quantities such as flow rates, tank volumes, and water bills, using the same formulas that appear on operator licensing exams.
64 materials written for this grade · refine by type, topic, or standard in the catalog
Grade 9 Math problem set
Hartwell Water Rates: Funding a Pipe Replacement Plan
A grade 9 problem set where students model a fictional town's water bill, calculate a rate increase and affordability burden, and graph a pipe-replacement schedule.
Grade 9 Lesson plan
Hazelmere's Snowmelt Season: Where a Linear Model Stops
A grade 9 lesson on a fictional mountain reservoir, where students build two linear models from snowmelt data and restrict each domain to what makes sense.
Grade 9 Worksheet
Hollisford Well Field: Specific Capacity and Drawdown Worksheet
A grade 9 worksheet on well drawdown and specific capacity, where students build and solve a linear model for a fictional municipal well.
Grade 9 Worksheet
Holloway Creek Plant: Nutrient Loading and Load Limits
A grade 9 worksheet at the fictional Holloway Creek plant, using the pounds formula to find nutrient loads and solving for a concentration that meets a permit.
Grade 9 Quiz & test questions
Kestrel Bend Water Plant: A Grade 9 Treatment Math Quiz
A 30-point grade 9 quiz mixing multiple-choice, short-answer, and computation items on dosing, detention time, removal efficiency, and pressure at a fictional plant.
Grade 9 Math problem set
Kettleridge Wastewater Plant: BOD Loading and the Pounds Formula
A grade 9 problem set using the pounds formula to track BOD loading and removal at Kettleridge's wastewater plant, then writing an equation for load from concentration.
Grade 9 Math problem set
Marbury Phosphorus Removal: Alum Dose and Nutrient Recovery
A grade 9 set using the pounds formula to size chemical dosing for phosphorus removal at a fictional water resource recovery facility, then to weigh nutrient recovery.
Grade 9 Worksheet
Marlbrook Lead Service Lines: A Replacement-Schedule Worksheet
A grade 9 worksheet where students model Marlbrook's 10-year lead service line replacement with a linear equation and check homes against the lead action level.
Grade 9 Worksheet
Marren River Oxygen Log: A Dissolved Oxygen Data Worksheet
A grade 9 worksheet using a fictional river's dissolved oxygen readings to find average rate of change and build a linear model against the 5 mg/L fish threshold.
Grade 9 Lesson plan
Marrisford's Lead Sampling: Finding the 90th Percentile
A grade 9 lesson where students order twenty fictional tap-water lead results, find the 90th percentile the way the rule does, and test it against the limit.
Grade 9 Project
Marrowfield's Water Loss: A Non-Revenue Water Reduction Project
A grade 9 project where teams audit a fictional utility's water loss, model savings with linear equations, and propose a repair plan within a fixed budget.
Grade 9 Math problem set
Netherford Wastewater Plant: BOD Removal and Loading Problem Set
A grade 9 problem set applying removal efficiency and the pounds formula to BOD at a fictional wastewater plant, checked against the 30 mg/L secondary standard.
Grade 9 Math problem set
Nethersby Water District: Operator Staffing and Wage Math
A grade 9 problem set on staffing a fictional utility's round-the-clock shifts, then comparing its starting wage with national operator pay and openings data.
Grade 9 Math problem set
Oakmere Pump Station: Wet Well Flow and Run Time
A grade 9 problem set at the fictional Oakmere pump station, finding wet-well volume, using Q equals A times V, converting cfs and MGD, and modeling the emptying time.
Grade 9 Worksheet
Ormsleigh School's Rain Cistern: Roof Yield and Tank Size
A grade 9 worksheet where students model a fictional school cistern as a cylinder, find the roof runoff from a storm, and size the tank to hold it.
Grade 9 Lesson plan
Ostgard Tiered Water Rates: A Block-Pricing Equations Lesson
A 55-minute grade 9 lesson where students write and graph a tiered water-rate equation for the Ostgard utility and test bills against an affordability threshold.
Grade 9 Math problem set
Perrin Bay Desalination: RO Recovery Rate and Energy Set
A grade 9 problem set on Perrin Bay's seawater reverse osmosis plant: recovery rate, concentrate flow, and the energy each thousand gallons of drinking water costs.
Grade 9 Math problem set
Pinebluff Water Rates: Tiered Billing and Break-Even
A grade 9 problem set on the fictional Pinebluff utility, building a tiered water bill as a linear equation and solving for where two rate plans cost the same.
Grade 9 Worksheet
Quillfen's Two Wells: Nitrate Box Plots and an Outlier
A grade 9 worksheet comparing eleven months of nitrate readings from two fictional wells using box plots, an outlier fence, and the mean against the median.
Grade 9 Lesson plan
Ravensford Chlorine Dosing: The Pounds Formula in Action
A 45-minute grade 9 lesson at the fictional Ravensford plant, using the pounds formula and demand-plus-residual to find a chlorine dose and daily feed rate.
Grade 9 Lesson plan
Ridgeport Pump Station: Total Dynamic Head and Pressure
A grade 9 lesson where students add static lift and friction to find total dynamic head, then convert between feet of head and psi for a fictional pump station.
Grade 9 Project
Sundale Reservoir Supply and Demand: A 20-Year Modeling Project
A multi-session grade 9 project where teams model Sundale's reservoir supply and city demand over 20 years, then propose a conservation plan to close the gap.
Grade 9 Worksheet
Underhill Plant Filters: Loading Rate and Turbidity Worksheet
A grade 9 worksheet treating filter loading rate as gallons per minute per square foot, sizing Underhill's filters and checking finished-water turbidity limits.