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'Ephriam' <br />Oahe Agropyron Cool Sod 115,000 5.5 <br />Intermediate intermedium <br />wheatgrass 'Oahe' <br />Vaughn Bouteloua Warm Sod 191,000 2.0 <br />sideoats grama° curtipendula <br /> Vaughn' <br />Lincoln smooth Bromus inermis Cool Sod 130,000 3.0 <br />brome leyss 'Lincoln' <br />Arriba western Agropyron Cool Sod 110,000 5.5 <br />wheatgrass smithii Aniba' <br />Total 17.5 <br />a All of the above seeding mixes and rates are based on drill seeding followed by crimped hay or straw mulch. <br />These rates should be doubled if seed is broadcast and should be increased by 50 percent if the seeding is done <br />using a Brillion Drill or is applied through hydraulic seeding. Hydraulic seeding may be substituted for drilling only <br />where slopes are steeper than 3:1. If hydraulic seeding is used, hydraulic mulching should be done as a separate <br />operation. <br />b See Table C-4 for seeding dates. <br />Crested wheatgrass should not be used on slopes steeper than 6H to 1 V. <br />a If site is to be irrigated, the transition turf seed rates should be doubled. <br />Could substitute 0.5 Ibs PLS of Blue grama for the 2.0 Ibs PLS of Vaughn sideoats grama. <br />Table C4-Seeding Dates for Annual and Perennial Grasses <br />• Annual Grasses Perennial Grasses <br />Seeding Dates Warm Cool Warm Cool <br />January 1-March 15 X X <br />March 16-April 30 X X X X <br />May 1-May 15 X X <br />May 16-June 30 X <br />July 1-July 15 X <br />July 16-August 31 <br />September 1-September 30 X <br />October 1-December 31 X X <br />Source: Urban Drainage and Flood Control District; Drainage Criteria Manual (V. 3), Construction Best <br />Management Practices (1999) <br />