A complete, no-prep 100-mark worksheet on the drainage basin system - ready to use for lessons, homework, or revision with KS3 Geography students aged 11-14.

A drainage basin is the area of land that a river and its tributaries collect water from. Geographers treat it as an open system, because water enters it as inputs and leaves it as outputs.

Structured across three sections of progressive difficulty: Section 1 (30 marks) covers inputs, stores, flows and key terms through five multiple choice questions, a ten-statement true/false table and a ten-gap word bank summary. Section 2 (40 marks) builds understanding through key term definitions, an input, output, store or flow classification table, and short answers on how trees intercept rain, fast and slow routes to the river, why rain becomes surface runoff, and why rivers keep flowing in dry weather. Section 3 (30 marks) challenges students with extended writing on how the route water takes decides whether a river floods, a new housing estate flood-risk scenario, and a comparison of two contrasting basins. A full answer key with detailed marking guidance is included. Comes as a PDF and an editable Word file (DOCX).

Also available: a companion extension pack with four enrichment activities, or save £1 with the complete lesson bundle - both listed on the iNewittAll TES store.

Google Classroom ready.

drainage basin
drainage basin system
drainage basin worksheet
open system
inputs and outputs
surface runoff
infiltration
throughflow
flood risk
rivers
KS3 Geography
Year 8 Geography
geography worksheet
100 mark worksheet
answer key included