Sizing a Pump for an Expanded Pond and Creek System

Turnover Rule

Aim to circulate 25-50% of total pond volume per hour. Your system: 300 gal + 3,000 gal = 3,300 gal total. Target: 825 - 1,650 GPH.

Head Height Matters

Measure vertical lift from pump outlet to top of waterfall. Add friction loss for 18 ft of pipe/stream. A pump rated 1,500 GPH at 0 head may only deliver 800 GPH at 6 ft head. Check the pump's performance curve.

Recommendation

Choose a pump rated for ~1,500-2,000 GPH at your actual head height. This provides flexibility for future expansion and ensures good waterfall flow.