Book excerpt: Introductory technical guidance for civil engineers, highway engineers and other professional engineers and construction managers interested in pavement drainage for streets and highways. Here is what is discussed: 1. INTRODUCTION, 2. FLOW OF WATER THROUGH SOILS, 3. QUANTITY AND RATE OF SUBSURFACE FLOW, 4. USE OF DRAINAGE LAYERS, 5. USE OF FILTERS, 6 USE OF SEPARATION LAYERS, 7. USE OF GEOTEXTILES.