Botanic Garden >> Gardening > >> Question and Answer >> Landscaping and Design

Building a 20-Foot Footbridge

For a 20-ft clear span, use a site-built wooden bridge with larger beams (Ron Hazelton's guide). Install railings. For vehicle loads or spans >25 ft, consider a refurbished rail flatcar on concrete abutments (flatcarbridge.com). Cheaper than new steel.

Landscaping and Design: The Three Most Important Fertilizer Elements: N, P, K—But Context Matters; Why Fertilizer? The Soil Secret Most Gardeners Miss; Sprinkler Timer Motor Replacement—DIY Procedure; Calculating GPM for Sprinkler System Design; Transforming a Wet, Soft Pasture into a Usable Lawn; Planting on a 2-Foot Retaining Wall: Year-Round Compact Plants for Philadelphia; Overcoming Business Struggles as a Landscape Designer; Carnivorous Plant Care Basics: Water, Humidity, Feeding, and Propagation Resources; String of Pearls (Senecio rowleyanus) ID & Care: Cactus Treatment; Dyed Mulch Transition: Soil Preparation and Long-term Management

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