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I I LAKE GIBSON MASTER PLAN AND SOUTHWEST DRAINAGE BASIN STORMWATER MANAGEMENT SYSTEM RETROFIT IHIGHLIGHTS: t • Hydrology • Ecology analysis ■ Modeling • Engineering analysis ■ Development of BMPs • Water quality • Analysis of municipal infrastructure ■ Storm water - I Lake Gibson, a 489-acre natural lake, is one of the 4 a\-PC-Fk re J4 Y 1 ' , , :-. 38-named lakes in Lakeland. Lake Gibson is unique it 7 f a yi�,k4 ti- r in that it has excellent water quality and supports a -FRS g. w�* r-- . + r, I well-balanced fauna. Due to the uniqueness of the .f°4+ d�'�`v'Nv ' St ''?•'i4}41 lake and the difficulty in remediating nutrient- rry'�.�°�.�� JJ' u0itt �i}[4 `tip 4r ' 't^ bv' 1, t A�a'�.% enriched waters, the City of Lakeland decided to i� ,4 i - ✓rx+ ; Y., ,, I take a proactive approach to reduce nutrient loading t ` xi 4 't' ` S Sir to the lake. This project entailed developing a r;� yi1. JrT �' �it y 'r 1 c E : stormwater management plan to identify and evalu- Ii`Rf+. ' C '1 ;' _� Iate source reduction and source control practices toLake Gibson i. 'r reduce the sediment and nutrient loading to the lake. 4m1/4...,,..t.... ' ' - lr'. is 4:s:: ,,ry:,,D ./a' - e 1t Continued development activities in the Lake Gib- �;` -,•� 1t: son watershed over the past 10 years created an in- i> r :`�.wy,� AT J creased threat to the water quality of the lake. The bill-�54\�o +# ,' rY, ,- 111 was particularly heavy in the areas in ' %sdButnrsi 5 .' C`_ It-- the southwest part of the watershed. Land use in this +_.-;' te ; ,�c t � ?, 1 �,�� 230-acre basin is mixed. A regional mall, highway R` . -'J)�} �'�, ,* ?iy g g d • A� L. 'r`EF ; , - t I widening, commercial development, and hotel and apartment construction have all occurred in recent le—iJl =tea.. ,. , 4 7j` ';' -�.:v tX± S n:: . • IF �� years in this area. Surface runoff through the basin �+- I was channeled into a highly modified ditch/stream t 4 `�; r ' , `-" = that runs from the upper reaches of the basin in the - " r ter••- ; ! PP -P. �'} ,-_, �.� southwest to the discharge point at the lake. The �� t`' `c3 " '' `l' '" i I extensive development of land contributed greatly to an increase in the peak runoff rates and volumes and also reduced the base flow. This has resulted in erosion of the stream channel with the deposition of eroded sediments and formation of a large sediment delta at the mouth of the stream. Stormwater Irunoff quality was documented as poor. In general this project included an ecological and engineering analysis of the stream and the contrib- I uting watershed, characterization of the hydrology of the basin, modeling of the drainage system; esti- mation of pollutant loadings to Lake Gibson from this basin, and development of a conceptual plan to address and alleviate problems the water quality, erosion, and flooding potential problems that were Iidentified by the City. ECT designed a retrofit stormwater system consisting of two off-line flow-through filter marshes and Ione off-line sedimentation basin. This segment also included a planting plan and monitorine. I / PROJECT PROFILE alla _I IV.'FTDDLSCI IJNE1WATERWROF11 SFL'LAKELVD-LAKEGmSON DOC-030912