(Amended by Ord. No. 181,758, Eff. 8/8/11.)
The owner shall be responsible for planting and maintaining all slopes where such is required in this Section.
1. Plant with grass or ground cover plants.
2. An irrigation system shall be installed to irrigate these slopes.
3. The owner shall water the slopes which have been planted with grasses and/or ground cover plants at sufficient time intervals to promote growth.
EXCEPTION: Where the Department finds the slope is located in such an area as to make hand watering possible, conveniently located hose bibs will be accepted in lieu of the required irrigation system when a hose no longer than 50 feet (15 240 mm) would be necessary.
1. Plant with grass or ground cover plants.
2. In addition to grass or ground cover plants, approved shrubs having a one gallon minimum size shall be planted on the slope at 10 feet (3048 mm) on center in both directions or trees at 20 feet (6096 mm) on center in both directions. A combination of shrubs and trees may be utilized. The plants and planting pattern may be varied on the recommendation of the landscape architect.
3. Install an adequate irrigation system during grading prior to planting of the shrubs and trees and before grading is approved.
91.7012.3.2. Irrigation systems shall be designed to provide a uniform water coverage at a rate of precipitation of not more than 3/10 inch (7.6 mm) per hour on the planted slope. In no event shall the duration of sprinkling be permitted such as to create a saturated condition and cause an erosion problem, or allow the discharge of excess water into any public or private street.
91.7012.3.6. Where PVC pipes are used on slopes, they shall be a minimum of schedule 40 and embedded at least eight inches (203 mm) below grade. Such pipes may be exposed for above ground installations provided they are ASTM rated as resistant to ultraviolet sunlight. All risers, sprinkler heads, valves and fittings shall be brass or galvanized metal, or rated as sunlight resistant.