Larry Smith, Videra Drive HOA <br />6  <br /> <br />2) Videra Creek Capacity Considerations <br />All stormwater from the proposed development is intended to be discharged into Videra Creek, which <br />passes through our property. Videra Creek does not have the capacity to receive any additional water flow. <br />Any increase in peak flows will increase erosion and impact the protected stream and damage private <br />property within our HOA common area. Applicant has not demonstrated that the new development has <br />outlets for stormwater of sufficient capacity to accept the water as described in the Stormwater <br />Management Manual (2014): <br />“1.9 FLOW CONTROL <br />Flow control is intended to protect downstream properties, infrastructure, and natural <br />resources from the increases in stormwater runoff peak flow rates and volumes resulting <br />from development. The City’s policy is to ensure that runoff leaving the post-development <br />site: <br />• Does not exceed the capacity of the receiving conveyance facility <br />• Does not increase the potential for stream bank and channel erosion “ <br /> <br />Further, the culvert crossing Videra Drive, shown in Figure 9, located as shown in Figure 11, carries all <br />stormwater from the subject property, along with the neighboring long-standing developments. It runs at <br />full capacity quite often during rainy periods. The 30” pipe is privately owned and maintained by the <br />Videra Drive HOA. It is not public property. This culvert frequently runs at full capacity during sustained <br />rain periods. We do not give permission to the applicant to make any changes in volume or flow rates <br />through the HOA-owned pipe, and will not consider granting such permission unless an acceptable plan is <br />presented. <br /> <br />We emphasize that our concerns are based upon the presence of erosion and water damage we have <br />experienced and continue seeing today. It is critical that this not be allowed to grow. <br /> <br />A recent landslide which significantly damaged two homes underlines this concern. The homes affected <br />had been stable for 30 years, but suffered damage due to soil movement during a high rainfall period. The <br />threat to property and lives was sufficient that an evacuation was required by the Fire Marshall, and a <br />long-term mitigation plan has yet to be determined. See newspaper article in Figure 10 and aerial view in <br />Figure 11. <br /> <br />Damage to the streambank can be seen in Figure 6 due to the high volume of water discharging from the <br />Videra Drive culvert (during heavy rains the culvert is full, shooting a stream out like a big firehose!). <br />Large trees on the streambank have been undermined by the fast water as can be seen in Figure 7. They <br />are in danger of falling and damaging houses nearby. During a storm a few years ago, the streambed <br />behind several houses was so severely eroded that costly bank remediation was required. The gabion s <br />needed to shore up the ground under a private deck can be seen in Figure 8. Flow exceeded the culvert <br />capacity and overflowed across Videra Drive. Repairing the damage from this event required intervention <br />by the Army Corps of Engineers and required 18 months to complete. <br /> <br />Page 56 of 87