2235 LAKE HEIGHTS DR 2020-12-23 - Laserfiche WebLink

I Ivent sediment from entering the system until completion of landscaping. Provide 18- inches of sod around each finished lawn and yard drain. ITable 11-4.2.2 Storm Drain Inlet Protection (p.358) lists several options for inlet protection. All of the methods for storm drain inlet protection tend to plug and require a high fre- quency of maintenance. Limit drainage areas to one acre or less. Possibly provide emer- Igency overflows with additional end-of-pipe treatment where stormwater ponding would cause a hazard. I Table 114.2.2 StormDrain Inlet Protection 1 Applicable four Type of lnlet Emergency Paved!Earthen: ConditiHieiliiillillili ons of Use Protection . Overflow Surfaces 13rap inlet Protection Excavated drop Yes, tern- Applicable for heavy flows. Easy inlet protection porary flood- Earthen to maintain. Large area Require- ingwill occur ment: 30'x30'/acre Block andI Applicable for heavy concentrated gravel drop inlet Yes Paved or Earthen flows. Will not pond. protection I Gravel and wire Applicable for heavy concentrated drop inlet pro- No flows.Will pond. Can withstand tection traffic. Catch basin filI - Yes Paved or Earthen Frequent Maintenance required. ters I Curb Inlet Protection Curb inlet pro- tection with Small capacity Paved Used for sturdy, more compact Iwooden weir overflow installation. Block and I gravel curb inlet Yes Paved Sturdy, but limited filtration. protection Culvert Inlet Protection I Culvert inlet Sed- iment trap 18 month expected life. IDesign and Installation Specifications Excavated Drop Inlet Protection -An excavated impoundment around the storm drain. ISediment settles out of the stormwater prior to entering the storm drain. I 2014 Stormwater Management Manual for Western Washington IVolume 11- Chapter 4 -Page 358